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Littérature scientifique sur le sujet « Plants Effect of stress on »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 27 juillet 2024

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Articles de revues sur le sujet "Plants Effect of stress on"

Arora, Rajeev, Dharmalingam S. Pitchay, and Bradford C. Bearce. "EFFECT OF WATER STRESS ON HEAT STRESS TOLERANCE IN GERANIUM." HortScience 31, no. 6 (October 1996): 915A—915. http://dx.doi.org/10.21273/hortsci.31.6.915a.

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This study evaluated the effect of reversible water stress on heat stress tolerance (HST) in greenhouse-grown geraniums. Water stress was imposed by withholding irrigation until pots reached ≈30% (by weight) of well-watered (control) plant pots, and maintaining this weight for 7 days. Control plants were watered to just below field capacity, every other day. Leaf xylem water potential (LXWP, MPa), leaf-relative water content (LRWC,%), media water content (MWC, % fresh weight), and heat stress tolerance (HST, LT50) were determined for control and stressed plants. HST (LT50), defined as temperat

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Gupta, Sonal, and Ashwini A. Waoo. "Effect of salinity stress on phytochemical characteristics of Centella asiatica." Journal of Applied and Natural Science 14, no. 2 (June 18, 2022): 684–91. http://dx.doi.org/10.31018/jans.v14i2.3387.

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Salinity is one of the predominant abiotic stresses which affects plant growth by inducing excessive production of reactive oxygen species (ROS) that leads to oxidative damage of plant cells. Plants alleviate salinity stress by regulating intracellular concentrations of various phytochemicals like phenol, tannin, antioxidants, etc. The present work aimed to study the impact of salt stress on the production of various phytochemicals like phenol, tannin, flavonoids, antioxidants, total protein content, etc. The Salt stress response of the test plant Centella asiatica was studied by irrigating va

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Shevchenko, A. V., I. G. Budzanivska, T. P. Shevchenko, and V. P. Polischuk. "Stress caused by plant virus infection in presence of heavy metals." Plant Protection Science 38, SI 2 - 6th Conf EFPP 2002 (December 31, 2017): 455–57. http://dx.doi.org/10.17221/10522-pps.

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Due to increased heavy metal content in Ukrainian soils, purpose of the work was to study relations between presence of heavy metals in soil and their effect on development of phytoviral infection. Experiments were conducted in Nicotiana tabacum – Potato virus X model system. Soluble salts of Cu, Zn and Pb were deposited in soil separately at the limiting concentrations simultaneously with virus infection of plants. Infected plants grown on usual soil showed symptoms of disease on 16 dpi as well as plants grown on soil with metals deposited. Contrary, combined effect of heavy metals and virus

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Krček, M., P. Slamka, K. Olšovská, M. Brestič, and M. Benčíková. "Reduction of drought stress effect in spring barley (Hordeum vulgare L.) by nitrogen fertilization." Plant, Soil and Environment 54, No. 1 (January 14, 2008): 7–13. http://dx.doi.org/10.17221/2781-pse.

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An effect of nitrogen rates (0.0 g, 1.0 g, 2.0 g N per pot) on NRA (nitrate reductase activity) in leaves of spring barley (cultivar Kompakt) was investigated in a pot experiment. Plants were grown under optimum moisture regime and drought stress was induced during the growth stages of tillering, shooting and earing. Before and after respective stress period plants were grown under optimal water regime. In all the fertilized and unfertilized treatments, NRA was significantly higher under optimal water regime than in drought stress conditions. Nitrogen fertilization alleviated adverse effects o

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Ali-Ahmad, M., and S. M. Basha. "Effect of Water Stress on Composition of Peanut Leaves." Peanut Science 25, no. 1 (January 1, 1998): 31–34. http://dx.doi.org/10.3146/i0095-3679-25-1-8.

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Abstract Water stress was induced in peanut (Arachis hypogaea L. cv. Marc 1) plants by withholding water for 5 to 20 d. Leaves from the water-stressed plants were analyzed to determine the effect of water stress on amino acids, sugars, protein content, and polypeptide composition of peanut plants. The results showed that the total protein content of the leaves significantly increased when peanut plants were subjected to water stress for 5 to 20 d as compared to irrigated controls. Analysis of the leaf protein by SDS polyacrylamide gel electrophoresis showed higher levels of polypeptides in str

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Handayani, Tri, and Kazuo Watanabe. "The combination of drought and heat stress has a greater effect on potato plants than single stresses." Plant, Soil and Environment 66, No. 4 (April 30, 2020): 175–82. http://dx.doi.org/10.17221/126/2020-pse.

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Several research groups have examined the effects of drought stress and heat stress on potato, but few investigations of the effects of combined drought-heat stress have been reported. Using five potato lines, the potato plants’ responses to drought stress, heat stress, as well as combined drought-heat stress were studied, to get the insight in phenotypic shift due to abiotic stresses. The experiment was conducted as a growth room experimental under non-stress and abiotic stresses (drought, heat, and combined drought-heat) conditions. The results demonstrated that potato plants responded to th

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Asadova, B. "Salinity Factor Effect on Barley Seedlings Incubation." Bulletin of Science and Practice 8, no. 1 (January 15, 2022): 81–85. http://dx.doi.org/10.33619/2414-2948/74/11.

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Stress factors limit the development of living organisms, especially plants, and reduce their productivity. In this regard, the study of the effects of stress factors on plants and the discovery of adaptation mechanisms play an important role in the regulation of stress in the cell. From a biological point of view, stress is considered to be any change in the external environment that impairs the normal development of the plant or changes it in a negative direction. Stresses cause changes in the physiological activity of plants, weaken the process of biosynthesis in the cell, disrupt normal li

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Thakur, Jaya, and Bharat Shinde. "Effect of water stress and AM fungi on the growth performance of pea." International Journal of Applied Biology 4, no. 1 (June 29, 2020): 36–43. http://dx.doi.org/10.20956/ijab.v4i1.9446.

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The study was conducted to determine the effect of arbuscular mycorrhizal (AM) fungi inoculation on growth of pea grown under water stressed pot culture conditions. Water stress was given to the pea plants after 30 days at the interval of 4, 8 and 12 days. The data was collected at an interval of 15 days. Three replicates of each set were maintained. . The mixture of AM fungi used for current experiment included the species of Acaulospora denticulata, A. gerdemannii, Glomus macrocarpum, G. maculosum, G. fasciculatum and Scutellospora minuta. The mycorrhizal plants have shown more shoot and roo

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Kaňová, D., and E. Kula. "The effect of stress factors on birch Betula pendula Roth." Journal of Forest Science 50, No. 9 (January 11, 2012): 399–404. http://dx.doi.org/10.17221/4636-jfs.

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In a controlled pot trial, plants of birch (Betula pendula Roth) were treated in six variants: acid watering (pH 3), acid watering with spraying, drought, ammonium sulphate fertilisation, ammonium sulphate fertilisation in combination with drought, and control. The response to the treatment with ammonium sulphate in terms of the increment was discordant as it increased the sensitivity of birch to frost. Drought had a negative effect on increments. A combination of ammonium sulphate and drought; drought; ammonium sulphate and sprayed acid watering delayed the shedding of leaves; this was due to

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Filiptsova, Halina G., and Vladimir M. Yurin. "Physiological and biochemical mechanisms of plants resistance to oxidative stress under peptide elicitor AtPep1." Journal of the Belarusian State University. Biology, no. 3 (November 5, 2021): 38–46. http://dx.doi.org/10.33581/2521-1722-2021-3-38-46.

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The effect of the peptide elicitor AtPep1 on the resistance of soybean and pea plants to oxidative stress was studied. The concentration of the peptide 10– 9 mol/L has the maximum elicitor effect on these plants. It was shown that treatment of the aerial part of seedlings with this peptide leads to an increase in the activity of peroxidase and superoxide dismutase and a decrease in the level of lipid peroxidation products in plants under oxidative stress. Revealed effects cause an increase in the plants resistance to stress.

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Thèses sur le sujet "Plants Effect of stress on"

Eakes, Donald Joseph. "Moisture stress conditioning, potassium nutrition, and tolerance of Salvia splendens 'Bonfire' to moisture stress." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54350.

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The objective of this study was to determine the leaf water relations, gas exchange, and growth of the bedding plant salvia Salvia splendens 'Bonfire‘ as influenced by moisture stress conditioning (MSC - exposing plants to 4 sublethal dry-down cycles) and potassium (K) nutrition. Plants were fertilized with one of six K rates: 25, 75, 150, 300, 450, and 600 ppm as KCl in experiment one. Seven weeks after seeding plants were subjected to MSC. MSC and increasing K rate resulted in osmotic adjustment and increased cellular turgor potentials. Foliar K content increased as osmotic potentials decrea

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Le, Fevre Ruth Elizabeth. "Phytate and plant stress responses." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708218.

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Choudhury, Feroza Kaneez. "Rapid Metabolic Response of Plants Exposed to Light Stress." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157543/.

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Environmental stress conditions can drastically affect plant growth and productivity. In contrast to soil moisture or salinity that can gradually change over a period of days or weeks, changes in light intensity or temperature can occur very rapidly, sometimes over the course of minutes or seconds. So, in our study we have taken an metabolomics approach to identify the rapid response of plants to light stress. In the first part we have focused on the ultrafast (0-90 sec) metabolic response of local tissues to light stress and in the second part we analyzed the metabolic response associated wit

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Kalifa, Ali. "Salt stress, and phosphorus absorption by potato plants cv. 'Russet Burbank'." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29727.pdf.

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Ingarfield, Patricia Jean. "Effect of water stress and arbuscular mycorrhiza on the plant growth and antioxidant potential of Pelargonium reniforme Curtis and Pelargonium sidoides DC." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2794.

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Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2018.<br>Pelargoniums have been studied extensively for their medicinal properties. P. reniforme and P. sidoides in particular are proven to possess antimicrobial, antifungal and antibiotic abilities due to their high antioxidant potential from compounds isolated from their tuberous roots. These plants have now been added to the medicine trade market and this is now causing concern for conservationists and they are generally harvested from the wild populations. This study evaluated the effect of water stress alone and in c

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Zhou, Maoqian 1961. "Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277231.

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The growth and Nitrogen fixation by one low salt tolerant alfalfa (Medicago sativa L.) and two germination salt tolerant selections inoculated with were investigated at two salt levels (0, -0.6 Mpa) and two N rates (1, 5ppm) using a system which automatically recirculates a nutrient solution. The high level of salinity (-0.6 Mpa osmotic potential of culture solution) resulted in substantial reduction in the N fixation percentage and total fixed N. The effect of salinity was more pronounced for later cuttings than for the earlier cutting. The N fixation percentages were substantially decreased

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Zegeer, Abreeza May 1956. "Interactions between saline stress and benzyladenine on chili peppers (Capsicum annuum L.)." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277069.

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Exogenous application of BA (0, 50, 100 mg ul--1) had no significant effects on tolerance of chili peppers to salt (--0.75 MPa NaCl:CaCl₂, 3:1, w/w) as measured by vegetative and reproductive weights, numbers of reproductive structures, transpiration and total chlorophyll. When peppers were applied with microliter amounts of ¹⁴C labelled benzyladenine (BA; 44,400 dpm 1⁻¹), BA was translocated primarily acropetally from the site of application. Regardless of application site, translocated BA was ported primarily to expanding leaves, and BA was more readily absorbed by leaf as opposed to stem su

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Wongareonwanakij, Sathaporn. "Effects of water stress and partial soil-drying on senescence of sunflower plants." Title page, contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09A/09aw872.pdf.

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Bibliography: leaves 98-123. This thesis investigates the symptoms of leaf senescence in response to plant shoot water stress and demonstrates the effect of a non-hydraulic root signal in the senescence response of mature leaves of sunflower. The alleviation of the leaf soluble protein loss rate by excision of the root system in drying soil indicates that this signal originates in roots in dry soil and acts to promote protein loss.

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Attumi, Al-Arbe. "Effect of salt stress on phosphorus and sodium absorptions by soybean plants." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20242.

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The radiotracer methodology was combined with the Hoagland solution culture of growing soybean in a greenhouse to investigate the absorptions of phosphorus (P), calcium (Ca), and sodium (Na) as a function of salinity. Salt stress was varied by using zero to 120 mM NaCl. The research was initiated because of a need to increase soybean production in the saline soils of the semi-arid regions of the world. Although P absorption increased with time at each concentration of NaCl, increasing its concentrations ([NaCl]) to 120 mM reduced P uptake considerably. The addition of inorganic P (Pi) to the s

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Maclear, Athlee. "Identification of cis-elements and transacting factors involved in the abiotic stress responses of plants." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1007236.

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Many stress situations limit plant growth, resulting in crop production difficulties. Population growth, limited availability and over-utilization of arable land, and intolerant crop species have resulted in tremendous strain being placed on agriculturalists to produce enough to sustain the world's population. An understanding of the principles involved in plant resistance to environmental stress will enable scientists to harness these mechanisms to create stress-tolerant crop species, thus increasing crop production, and enabling the farming of previously unproductive land. This research proj

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Livres sur le sujet "Plants Effect of stress on"

M, Orcutt David, and Hale Maynard G, eds. The physiology of plants under stress. New York: Wiley, 1996.

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Sir, Fowden Leslie, Mansfield T. A, Stoddart John, and Rank Prize Funds, eds. Plant adaptation to environmental stress. London: Chapman & Hall, 1993.

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A, Khan Nafees, and Singh Sarvajeet, eds. Abiotic stress and plant responses. New Delhi: I.K. International Pub. House, 2008.

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Shabala, S. Plant stress physiology. Edited by C. A. B. International. Cambridge, MA: CABI, 2012.

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Kadukova, Jana. Phytoremediation and stress: Evaluation of heavy metal-induced stress in plants. Hauppauge, N.Y: Nova Science Publishers, 2010.

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K, Panda S., ed. Advances in stress physiology of plants. Jodhpur: Scientific Publishers (India), 2002.

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S, Basra Amarjit, ed. Stress-induced gene expression in plants. Chur, Switzerland: Harwood Academic Publishers, 1994.

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Haryana, Nikhil. Abiotic stress: New research. Hauppauge, N.Y: Nova Science Publisher's, Inc., 2011.

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Heinrich, Sandermann, ed. Molecular ecotoxicology of plants. Berlin: Springer, 2004.

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G, Alscher Ruth, and Cumming Jonathan R, eds. Stress responses in plants: Adaptation and acclimation mechanisms. New York: Wiley-Liss, 1990.

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Chapitres de livres sur le sujet "Plants Effect of stress on"

Kaur, Harpreet, Renu Bhardwaj, Vinod Kumar, Anket Sharma, Ravinder Singh, and Ashwani Kumar Thukral. "Effect of pesticides on leguminous plants." In Legumes under Environmental Stress, 91–101. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118917091.ch6.

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Ivanov, Anatoly A. "Response of Wheat Seedlings to Combined Effect of Drought and Salinity." In Stress Responses in Plants, 159–98. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13368-3_7.

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Pérez-Pastor, Alejandro, M. Carmen Ruiz-Sánchez, and María R. Conesa. "Drought stress effect on woody tree yield." In Water Stress and Crop Plants, 356–74. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119054450.ch22.

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Hajiboland, R. "Effect of Micronutrient Deficiencies on Plants Stress Responses." In Abiotic Stress Responses in Plants, 283–329. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0634-1_16.

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Khalid, Muhammad Fasih, Iqra Zakir, Rashid Iqbal Khan, Sobia Irum, Samreen Sabir, Nishat Zafar, Shakeel Ahmad, Mazhar Abbas, Talaat Ahmed, and Sajjad Hussain. "Effect of Water Stress (Drought and Waterlogging) on Medicinal Plants." In Medicinal Plants, 169–82. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5611-9_6.

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Srivastava, Kavita, Sachidanand Singh, Anupam Singh, Tanvi Jain, Rahul Datta, and Abhidha Kohli. "Effect of Temperature (Cold and Hot) Stress on Medicinal Plants." In Medicinal Plants, 153–68. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5611-9_5.

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Koshita, Yoshiko. "Effect of Temperature on Fruit Color Development." In Abiotic Stress Biology in Horticultural Plants, 47–58. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-55251-2_4.

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Tripathi, Durgesh Kumar, Swati Singh, Shweta Singh, Devendra Kumar Chauhan, Nawal Kishore Dubey, and Rajendra Prasad. "Silicon as a beneficial element to combat the adverse effect of drought in agricultural crops." In Water Stress and Crop Plants, 682–94. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119054450.ch39.

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Hemati, Arash, Ebrahim Moghiseh, Arian Amirifar, Morteza Mofidi-Chelan, and Behnam Asgari Lajayer. "Physiological Effects of Drought Stress in Plants." In Plant Stress Mitigators, 113–24. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7759-5_6.

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Flowers, T. S., and A. R. Yeo. "Effects of Salinity on Plant Growth and Crop Yields." In Environmental Stress in Plants, 101–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73163-1_11.

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Actes de conférences sur le sujet "Plants Effect of stress on"

Baranova, E. N. "The effect of edaphic stress factors on plant cell compartments." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-57.

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Arkhipova, T. N., and E. V. Martynenko. "The effect of hormone producing bacteria on plant growth and stress tolerance." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-48.

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Kreslavsky, V. D., A. Yu Khudyakova, and V. Yu Lyubimov. "The effect of the phytochrome system on the stress resistance of the photosynthetic apparatus." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-237.

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Ponomareva, M. L., and S. N. Ponomarev. "Features of adaptation to winter stress and the effect of proline accumulation in winter cereals." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-362.

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Evseeva, N. V., A. Yu Denisova, G. L. Burygin, N. N. Pozdnyakova, and O. V. Tkachenko. "Coinoculation effect of potato microclones by rhizosphere bacteria under osmotic stress in vitro." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.067.

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Popescu, Monica. "ASCOPHYLLUM NODOSUM SEAWEED EXTRACT EFFECT ON DROUGHT STRESS IN BEAN PLANTS." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017h/63/s25.017.

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Ozolina, N. V., V. V. Gurina, and I. S. Nesterkina. "The effect of different types of abiotic stress on the dynamics of the content of common sterols of beet tonoplast (Beta vulgaris L.)." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-324.

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Zeng, Lizhang, and Da Xing. "Alteration in delayed fluorescence characterize the effect of heat stress on plants." In Photonics Asia 2004, edited by Yun-Jiang Rao, Osuk Y. Kwon, and Gang-Ding Peng. SPIE, 2005. http://dx.doi.org/10.1117/12.572779.

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Lukatkin, A. S., D. I. Bashmakov, E. Sh Sharkaeva, and A. A. Lukatkin. "Determining the effectiveness of growth regulators in the analysis of the effects of stress factors on plants." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-264.

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Pozhvanov, G. A., E. I. Sharova, and S. S. Medvedev. "Redox-dependent reorganization of the actin cytoskeleton in the root of arabidopsis under stress and regulatory effects." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-357.

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Rapports d'organisations sur le sujet "Plants Effect of stress on"

Mosquna, Assaf, and Sean Cutler. Systematic analyses of the roles of Solanum Lycopersicum ABA receptors in environmental stress and development. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604266.bard.

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Drought and other abiotic stresses have major negative effects on agricultural productivity. The plant hormone abscisic acid (ABA) regulates many responses to environmental stresses and can be used to improve crop performance under stress. ABA levels rise in response to diverse abiotic stresses to coordinate physiological and metabolic responses that help plants survive stressful environments. In all land plants, ABA receptors are responsible for initiating a signaling cascade that leads to stomata closure, growth arrest and large-scale changes in transcript levels required for stress toleranc

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Handa, Avtar K., Yuval Eshdat, Avichai Perl, Bruce A. Watkins, Doron Holland, and David Levy. Enhancing Quality Attributes of Potato and Tomato by Modifying and Controlling their Oxidative Stress Outcome. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586532.bard.

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General The final goal and overall objective of the current research has been to modify lipid hydroperoxidation in order to create desirable phenotypes in two important crops, potato and tomato, which normally are exposed to abiotic stress associated with such oxidation. The specific original objectives were: (i) the roles of lipoxygenase (LOX) and phospholipids hydroperoxide glutathione peroxidase (PHGPx) in regulating endogenous levels of lipid peroxidation in plant tissues; (ii) the effect of modified lipid peroxidation on fruit ripening, tuber quality, crop productivity and abiotic stress

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Kirova, Elisaveta. Effect of Nitrogen Nutrition Source on Antioxidant Defense System of Soybean Plants Subjected to Salt Stress. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, February 2020. http://dx.doi.org/10.7546/crabs.2020.02.09.

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Alchanatis, Victor, Stephen W. Searcy, Moshe Meron, W. Lee, G. Y. Li, and A. Ben Porath. Prediction of Nitrogen Stress Using Reflectance Techniques. United States Department of Agriculture, November 2001. http://dx.doi.org/10.32747/2001.7580664.bard.

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Commercial agriculture has come under increasing pressure to reduce nitrogen fertilizer inputs in order to minimize potential nonpoint source pollution of ground and surface waters. This has resulted in increased interest in site specific fertilizer management. One way to solve pollution problems would be to determine crop nutrient needs in real time, using remote detection, and regulating fertilizer dispensed by an applicator. By detecting actual plant needs, only the additional nitrogen necessary to optimize production would be supplied. This research aimed to develop techniques for real tim

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Christopher, David A., and Avihai Danon. Plant Adaptation to Light Stress: Genetic Regulatory Mechanisms. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586534.bard.

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Original Objectives: 1. Purify and biochemically characterize RB60 orthologs in higher plant chloroplasts; 2. Clone the gene(s) encoding plant RB60 orthologs and determine their structure and expression; 3. Manipulate the expression of RB60; 4. Assay the effects of altered RB60 expression on thylakoid biogenesis and photosynthetic function in plants exposed to different light conditions. In addition, we also examined the gene structure and expression of RB60 orthologs in the non-vascular plant, Physcomitrella patens and cloned the poly(A)-binding protein orthologue (43 kDa RB47-like protein).

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Fromm, Hillel, and Joe Poovaiah. Calcium- and Calmodulin-Mediated Regulation of Plant Responses to Stress. United States Department of Agriculture, September 1993. http://dx.doi.org/10.32747/1993.7568096.bard.

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We have taken a molecular approach to clone cellular targets of calcium/calmodulin (Ca2+/CaM). A 35S-labeled recombinant CaM was used as a probe to screen various cDNA expression libraries. One of the isolated clones from petunia codes for the enzyme glutamate decarboxylase (GAD) which catalyzes the conversion of glutamate to g-aminobutyric acid (GABA). The activity of plant GAD has been shown to be dramatically enhanced in response to cold and heat shock, anoxia, drought, mechanical manipulations and by exogenous application of the stress phytohormone ABA in wheat roots. We have purified the

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Seginer, Ido, Daniel H. Willits, Michael Raviv, and Mary M. Peet. Transpirational Cooling of Greenhouse Crops. United States Department of Agriculture, March 2000. http://dx.doi.org/10.32747/2000.7573072.bard.

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Background Transplanting vegetable seedlings to final spacing in the greenhouse is common practice. At the time of transplanting, the transpiring leaf area is a small fraction of the ground area and its cooling effect is rather limited. A preliminary modeling study suggested that if water supply from root to canopy is not limiting, a sparse crop could maintain about the same canopy temperature as a mature crop, at the expense of a considerably higher transpiration flux per leaf (and root) area. The objectives of this project were (1) to test the predictions of the model, (2) to select suitable

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Amir, Rachel, David J. Oliver, Gad Galili, and Jacline V. Shanks. The Role of Cysteine Partitioning into Glutathione and Methionine Synthesis During Normal and Stress Conditions. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7699850.bard.

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The objective of this research is to study the nature of the competition for cysteine (Cys), the first organic sulfur-containing compound, between its two main metabolites, glutathione (GSH) and methionine (Met). GSH plays a central role in protecting plants during various stresses, while Met, an essential amino acid, regulates essential processes and metabolites in plant cells through its metabolite S-adenosyl-Met. Our results, which are based on flux analysis and measurements of Met- metabolites, show that the flux towards Met synthesis is high during non-stress conditions, however the flux

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Wolf, Shmuel, and William J. Lucas. Involvement of the TMV-MP in the Control of Carbon Metabolism and Partitioning in Transgenic Plants. United States Department of Agriculture, October 1999. http://dx.doi.org/10.32747/1999.7570560.bard.

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The function of the 30-kilodalton movement protein (MP) of tobacco mosaic virus (TMV) is to facilitate cell-to-cell movement of viral progeny in infected plants. Our earlier findings have indicated that this protein has a direct effect on plasmodesmal function. In addition, these studies demonstrated that constitutive expression of the TMV MP gene (under the control of the CaMV 35S promoter) in transgenic tobacco plants significantly affects carbon metabolism in source leaves and alters the biomass distribution between the various plant organs. The long-term goal of the proposed research was t

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Jander, Georg, Gad Galili, and Yair Shachar-Hill. Genetic, Genomic and Biochemical Analysis of Arabidopsis Threonine Aldolase and Associated Molecular and Metabolic Networks. United States Department of Agriculture, January 2010. http://dx.doi.org/10.32747/2010.7696546.bard.

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Since the amino acids threonine and isoleucine can be limiting in mammalian diet and there is interest in increasing their abundance in certain crop plants. To meet this need, a BARD proposal was written with two main research objectives: (i) investigate new avenues for manipulating threonine and isoleucine content in plants and (ii) study the role of threonine aldolase in plant metabolism. Research conducted to meet these goals included analysis of the sub-cellular localization of threonine aldolase in the plant, analysis of metabolic flux in developing embryos, over- and under-expression of

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