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Journal articles on the topic 'Clinostat. Plants'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Hoson, T., S. Kamisaka, M. Yamashita, and Y. Masuda. "Automorphosis of higher plants on a 3-d clinostat." Advances in Space Research 21, no. 8-9 (January 1998): 1229–38. http://dx.doi.org/10.1016/s0273-1177(97)00640-6.

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2

Oluwafemi, Funmilola. "Gravity Variation Effects on the Growth of Maize Shoots." Physical Sciences Forum 2, no. 1 (May 27, 2021): 21. http://dx.doi.org/10.3390/ecu2021-10184.

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Gravity variation effects on plants provide definite changes. Normal Earth gravity (1G) and microgravity (µg) are possible variations for experimental purposes. On-board spaceflight microgravity experiments are rare and expensive, as the microgravity environment is an outstanding platform for research, application and education. A Clinostat was used for ground-based experiments to investigate the shoot morphology of maize plants at the Space Agency of Nigeria—National Space Research and Development Agency (NASRDA). A Clinostat device uses rotation to negate gravitational pull effects on plant growth and development. Maize was selected for this experiment because of its nutritional and economic importance, and its usability on the Clinostat. Plant shoot morphology is important for gravi-responses. Shoot curvature and shoot growth rate analyses were conducted on the shoots of a provitamin variety of maize. The seeds were planted into three Petri dishes (in parallel) in a wet chamber using a plant substrate—agar-agar. The experimental conditions were subject to relative humidity, temperature and light conditions. After 3 days of germination under 1G, two of the Petri dishes were left under 1G, serving as controls for shoot curvature and shoot growth rate analyses. The clinorotated sample was mounted on the Clinostat under: a fast rotation speed of 80 rpm, a horizontal rotation position and a clockwise rotation direction. The images of the samples were taken at a 30 min interval for 4 h. After observations, the shoot morphology of the seedlings was studied using ImageJ software. The grand average shoot angles and shoot lengths of all the seedlings were calculated following the experimental period to provide the shoot curvatures and shoot growth rates, respectively. The results show that the clinorotated sample had a reduced response to gravity, with 50.77°/h for the shoot curvature, while the 90°-turned sample had 55.49°/h. The shoot growth rate for the 1G sample was 1.25 cm/h, while that for the clinorotated sample was 1.26 cm/h. The clinorotated sample had an increased growth rate per hour compared to the counterpart 1G sample. These analytical results serve as preparation for future real-space experiments on maize and could be beneficial to the agriculture sector.

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3

Hershey, David R. "Time for a Plant Clinostat: EFFECTS OF LIGHT AND GRAVITY ON PLANTS." Science Activities: Classroom Projects and Curriculum Ideas 42, no. 1 (April 2005): 30–35. http://dx.doi.org/10.3200/sats.42.1.30-35.

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4

Zulkifli, Nur Athirah, Teoh Chin Chuang, Ong Keat Khim, Ummul Fahri Abdul Rauf, Norliza Abu Bakar, and Wan Md Zin Wan Yunus. "Effects of simulated microgravity on rice (MR219) growth and yield." Malaysian Journal of Fundamental and Applied Sciences 14, no. 2 (June 3, 2018): 278–83. http://dx.doi.org/10.11113/mjfas.v14n2.863.

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Rice (Oryza sativa L.) is a staple food in many Asian countries with an ever increasing demand. However, the production of high quality rice seeds is insufficient to meet this demand. Research on plant growth in space related to the exposure of a microgravity environment are rare, costly and time-limited. Similar experiments can be conducted on the ground to simulate the microgravity condition using a 2-D clinostat which compensates for the unilateral influence of gravity. This study was conducted to establish a simple and cost effective technique to enhance the quality of the Malaysian rice seed variety MR 219 by using a 2-D clinostat and to determine the effects of simulated microgravity on the growth and yield of the rice seeds. The experiments were performed at different rotation speeds (2 rpm and 10 rpm) for 10 days at room temperature. The rice growth and yield parameters were measured every 2 weeks and at harvest time (day 110), respectively. The data were analysed using the MINITAB statistical software package. The mean value estimates of the parameters obtained under different conditions were compared using analysis of variance (ANOVA) with the Tukey test for multiple comparisons using a 0.05 significance level. Significant differences in the number of tiller, stem width , chlorophyll content , weight of grains and panicles and total grain weight per plant were identified at rotation speed 10 rpm when compared to rotation speed 2 rpm and control. The highest means were mainly obtained under 10 rpm clinorotated rice seeds. In general, plants grown from 10 rpm clinorotated seeds are also more resistant to rice diseases (rice blast disease, rice tungro disease and hopper burn). These results suggest that simulated microgravity using a 2-D clinostat affected several rice (MR219) growth and yield parameters significantly.

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5

Shimazu, T., T. Yuda, K. Miyamoto, M. Yamashita, and J. Ueda. "Growth and development in higher plants under simulated microgravity conditions on a 3-dimensional clinostat." Advances in Space Research 27, no. 5 (2001): 995–1000. http://dx.doi.org/10.1016/s0273-1177(01)00165-x.

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6

Nhựt, Dương Tấn, Nguyễn Xuân Tuấn, Nguyễn Thị Thùy Anh, Nguyễn Bá Nam, Nguyễn Phúc Huy, Hoàng Thanh Tùng, Vũ Thị Hiền, Vũ Quốc Luận, Bùi Thế Vinh, and Trần Công Luận. "Effects of simulated microgravity on seed germination, growth, development and accumulated secondary compounds of Hibiscus sagittifolius Kurz. cultured in vitro." Vietnam Journal of Biotechnology 15, no. 1 (April 20, 2018): 73–85. http://dx.doi.org/10.15625/1811-4989/15/1/12322.

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In the present study, Hibiscus sagittifolius Kurz. seeds were used as the plant materials for studying on the effects of simulated microgravity (on a 2D clinostat) on seed germination, shoot multiplication, growth, development and secondary metabolite accumulation. After surface sterilization, seeds were cultured on MS medium supplemeted with 30 g/l sucrose and 9 g/l agar in Petri dishes (9 seeds per dish, the seed to seed distance of 1.5 cm and kept in the same direction), and maintained in a Clinostat (2 rpm). The results showed that simulated microgravity inhibited the growth and development of Hibiscus sagittifolius roots with root length of 11.83 cm, fresh and dry weight of 58.28 and 5.23 mg, respectively but it made an increase in germination rate (87%) and accumulation of secondary metabolites (the total saponins content of 53.00 mg/g and the total coumarin content of 25.67 mg/g) after 3 weeks of culture. In addition, the simulated microgravity also resulted in positive shoot multiplication (shoot height of 3.07 cm, 6.33 nodes per shoot, 3.33 shoots per explant, and the fresh and dry weight of 401.33 and 37.00 mg, respectively), and growth and development of Hibiscus sagittifolius shoots (plant height of 12.17 cm with 5.67 leaves per shoot together with the average root length of 1.77 cm, and the fresh and dry weight of 419.00 and 36.00 mg) after 4 weeks of culture. The results from this study could be attributed to future perspectives in research on plant breeding and accumulation of secondary metabolites in medicinal plants.

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7

Kozeko, Liudmyla Y., Denis D. Buy, Yaroslav V. Pirko, Yaroslav B. Blume, and Elizaveta L. Kordyum. "Clinorotation Affects Induction of the Heat Shock Response in Arabidopsis thaliana Seedlings." Gravitational and Space Research 6, no. 1 (July 20, 2020): 2–9. http://dx.doi.org/10.2478/gsr-2018-0001.

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AbstractClinorotation used to simulate microgravity effects in ground-based experiments is considered as a mild stress factor for plants. We have assumed that it might influence the plant tolerance to other stressful factors. To test this, Arabidopsis thaliana seedlings were grown on a horizontal clinostat (2 rpm) or under stationary conditions (control), and then were subjected to heat treatment. The kinetics of gene expression of cytosolic HSP70s and HSP90s during exposure to 37°C for 0.5-2 h was examined by RT-qPCR to estimate level of the heat shock reaction. It was shown that clinorotation caused the minor increase in transcript abundance of five AtHSP70s and AtHSP90-1 under normal temperature, as well as a faster onset and enhancement of their induction during heat shock. The heat tolerance was evaluated as a function of seedling survival after exposure to 45°C for 45 min. Seedlings grown under clinorotation were determined to withstand heat treatment better than seedlings grown under stationary conditions. The obtained data support the assumption that clinorotation may provide cross-protection of plants against fluctuations in environmental conditions.

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8

Rupiasih, Ni Nyoman, Ni Kadek Gita Hari Yanti, Made Sumadiyasa, and I. B. S. Manuaba. "The effect of various disturbances on the seeds on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of cayenne pepper Seedlings." BULETIN FISIKA 19, no. 1 (July 1, 2018): 35. http://dx.doi.org/10.24843/bf.2018.v19.i01.p07.

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Study on the effect of various disturbances on the cayenne pepper seeds (Capsicum Frutescens L.) to the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants in the germination period have been done. The disturbances given include UV-C irradiation for 1 hour (S1), microgravity for 12 hours (S2), for 24 hours (S3), and for 48 hours (S4), as well as combined disturbances that are UV-C irradiation for 1 hour followed by microgravity for 12 hours (S5), for 24 hours (S6), and for 48 hours (S7). As comparison, it has been used seeds without treatment called control (S0). The microgravity environment was created using a 2-D clinostat with a rotational speed of 2.7 rpm (1.2 x 10-4 g). All samples were grown in normal gravity (1 g) environment. Observations were made during the vegetative phase until the plant was 40 days old. Measurements of chlorophyll a, chlorophyll b, carotenoids, and biomass were performed at the plants were 10, 20, and 40 days old. The results showed that disturbances which given on the seeds gave positive effects on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants. The impacts depend on the duration of the disturbances given.

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9

Shadrina, R. Yu, A. I. Yemets, and Ya B. Blume. "Autophagy development as an adaptive response to microgravity conditions in Arabidopsis thaliana." Faktori eksperimental'noi evolucii organizmiv 25 (August 30, 2019): 327–32. http://dx.doi.org/10.7124/feeo.v25.1186.

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Aim. The main aim of the study was to analyze the effect of microgravity on the growth and development of Arabidopsis thaliana seedlings at different time intervals of cultivation (4–10 days) and to investigate the development of autophagy induced by the conditions of microgravity in seedlings root cells. Methods. Microscopic methods as well as in vitro propagation method were used. To simulate of microgravity conditions plants were placed in clinostat machine. Results. In the course of experiments, the peaks of the formation of autophagosome were recorded: in the cells of the root cap zone of at 9th day and in the cells of the root zone extension on the 10th day of clinical establishment. Conclusions. It can be concluded that microgravity is capable to induce the development of autophagy in the roots of A. thaliana seedlings. Cells with signs of autophagy were revealed on the 9th and 10th day of cultivation of seedlings under microgravity conditions. Keywords: Arabidopsis thaliana, autophagy, microgravity.

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10

De Micco, Veronica, Michele Scala, and Giovanna Aronne. "Evaluation of the effect of clinostat rotation on pollen germination and tube development as a tool for selection of plants in Space." Acta Astronautica 58, no. 9 (May 2006): 464–70. http://dx.doi.org/10.1016/j.actaastro.2005.12.019.

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11

Gouws, Chrisna, Tanya Smit, Clarissa Willers, Hanna Svitina, Carlemi Calitz, and Krzysztof Wrzesinski. "Anticancer Potential of Sutherlandia frutescens and Xysmalobium undulatum in LS180 Colorectal Cancer Mini-Tumors." Molecules 26, no. 3 (January 25, 2021): 605. http://dx.doi.org/10.3390/molecules26030605.

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Colorectal cancer remains to be one of the leading causes of death worldwide, with millions of patients diagnosed each year. Although chemotherapeutic drugs are routinely used to treat cancer, these treatments have severe side effects. As a result, the use of herbal medicines has gained increasing popularity as a treatment for cancer. In this study, two South African medicinal plants widely used to treat various diseases, Sutherlandia frutescens and Xysmalobium undulatum, were evaluated for potential activity against colorectal cancer. This potential activity for the treatment of colorectal cancer was assessed relative to the known chemotherapeutic drug, paclitaxel. The cytotoxic activity was considered in an advanced three-dimensional (3D) sodium alginate encapsulated LS180 colorectal cancer functional spheroid model, cultured in clinostat-based rotating bioreactors. The LS180 cell mini-tumors were treated for 96 h with two concentrations of each of the crude aqueous extracts or paclitaxel. S. frutescens extract markedly decreased the soluble protein content, while decreasing ATP and AK per protein content to below detectable limits after only 24 h exposure. X. undulatum extract also decreased the soluble protein content, cell viability, and glucose consumption. The results suggested that the two phytomedicines have potential to become a source of new treatments against colorectal cancer.

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12

Brown, Allan H., Anders Johnsson, David K. Chapman, and David Heathcote. "Gravitropic responses of the Avena coleoptile in space and on clinostats. IV. The clinostat as a substitute for space experiments." Physiologia Plantarum 98, no. 1 (September 1996): 210–14. http://dx.doi.org/10.1111/j.1399-3054.1996.tb00694.x.

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13

Shen-Miller, J., and R. R. Hinchman. "Nucleolar transformation in plants grown on clinostats." Protoplasma 185, no. 3-4 (September 1995): 194–204. http://dx.doi.org/10.1007/bf01272860.

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14

Steinitz, Benjamin, Th�r�se Best, and Kenneth L. Poff. "Phototropic fluence-response relations for Avena coleoptiles on a clinostat." Planta 176, no. 2 (1988): 189–95. http://dx.doi.org/10.1007/bf00392444.

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15

Sailer, H., P. Nick, and E. Sch�fer. "Inversion of gravitropism by symmetric blue light on the clinostat." Planta 180, no. 3 (September 1990): 378–82. http://dx.doi.org/10.1007/bf01160393.

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16

Galland, Paul, Heike Finger, and Yvonne Wallacher. "Gravitropism in Phycomyces: Threshold determination on a clinostat centrifuge." Journal of Plant Physiology 161, no. 6 (January 2004): 733–39. http://dx.doi.org/10.1078/0176-1617-01082.

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17

Nick, P., and E. Sch�fer. "Nastic response of maize (Zea mays L.) coleoptiles during clinostat rotation." Planta 179, no. 1 (August 1989): 123–31. http://dx.doi.org/10.1007/bf00395779.

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18

Dexheimer, Jean, Joëlle Gérard, and Patricia Genet. "Etude des modalités de la mycorhization de pivots d'Eucalyptus globulusdéveloppés en clinostat." Acta Botanica Gallica 141, no. 4 (January 1994): 511–16. http://dx.doi.org/10.1080/12538078.1994.10515191.

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19

Mischenko, L. T., T. Kiihne, I. A. Mischenko, and A. L. Boyko. "Infection process of wheat streak mosaic virus in clinostated Apogee wheat plants." Kosmìčna nauka ì tehnologìâ 8, no. 5-6 (November 30, 2003): 211–15. http://dx.doi.org/10.15407/knit2003.05.211.

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20

MOORE, RANDY. "How Effectively Does a Clinostat Mimic the Ultrastructural Effects of Microgravity on Plant Cells?" Annals of Botany 65, no. 2 (February 1990): 213–16. http://dx.doi.org/10.1093/oxfordjournals.aob.a087926.

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21

Hoson, Takayuki, Seiichiro Kamisaka, Yoshio Masuda, and Masamichi Yamashita. "Changes in plant growth processes under microgravity conditions simulated by a three-dimensional clinostat." Botanical Magazine Tokyo 105, no. 1 (March 1992): 53–70. http://dx.doi.org/10.1007/bf02489403.

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22

Wang, Hui, Hui Qiong Zheng, Wei Sha, Rong Zeng, and Qi Chang Xia. "A proteomic approach to analysing responses of Arabidopsis thaliana callus cells to clinostat rotation." Journal of Experimental Botany 57, no. 4 (January 31, 2006): 827–35. http://dx.doi.org/10.1093/jxb/erj066.

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23

Hoson, Takayuki, Seiichiro Kamisaka, Ryoichi Yamamoto, Masamichi Yamashita, and Yoshio Masuda. "Automorphosis of maize shoots under simulated microgravity on a three-dimensional clinostat." Physiologia Plantarum 93, no. 2 (February 1995): 346–51. http://dx.doi.org/10.1111/j.1399-3054.1995.tb02238.x.

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24

Kern, Volker D., Jochen M. Schwuchow, David W. Reed, Jeanette A. Nadeau, Jessica Lucas, Alexander Skripnikov, and Fred D. Sack. "Gravitropic moss cells default to spiral growth on the clinostat and in microgravity during spaceflight." Planta 221, no. 1 (January 20, 2005): 149–57. http://dx.doi.org/10.1007/s00425-004-1467-3.

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25

Driss-Ecole, D., A. Cottignies, B. Jeune, F. Corbineau, and G. Perbal. "Increased mass production of Veronica arvensis grown on a slowly rotating clinostat." Environmental and Experimental Botany 34, no. 3 (July 1994): 303–10. http://dx.doi.org/10.1016/0098-8472(94)90051-5.

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26

Rivière, Mathieu, Yoann Corre, Alexis Peaucelle, Julien Derr, and Stéphane Douady. "The hook shape of growing leaves results from an active regulatory process." Journal of Experimental Botany 71, no. 20 (August 20, 2020): 6408–17. http://dx.doi.org/10.1093/jxb/eraa378.

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Abstract The rachis of most growing compound leaves observed in nature exhibits a stereotypical hook shape. In this study, we focus on the canonical case of Averrhoa carambola. Combining kinematics and mechanical investigation, we characterize this hook shape and shed light on its establishment and maintenance. We show quantitatively that the hook shape is a conserved bent zone propagating at constant velocity and constant distance from the apex throughout development. A simple mechanical test reveals non-zero intrinsic curvature profiles for the rachis during its growth, indicating that the hook shape is actively regulated. We show a robust spatial organization of growth, curvature, rigidity, and lignification, and their interplay. Regulatory processes appear to be specifically localized: in particular, differential growth occurs where the elongation rate drops. Finally, impairing the graviception of the leaf on a clinostat led to reduced hook curvature but not to its loss. Altogether, our results suggest a role for proprioception in the regulation of the leaf hook shape, likely mediated via mechanical strain.

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27

Aronne, Giovanna, Veronica De Micco, Paolo Ariaudo, and Stefania De Pascale. "The effect of uni-axial clinostat rotation on germination and root anatomy ofPhaseolus vulgarisL." Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology 137, no. 2 (January 2003): 155–62. http://dx.doi.org/10.1080/11263500312331351421.

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28

Legue, Valerie, Dominique Driss-Ecole, and Gerald Perbal. "Cell cycle and cell differentiation in lentil roots grown on a slowly rotating clinostat." Physiologia Plantarum 84, no. 3 (March 1992): 386–92. http://dx.doi.org/10.1111/j.1399-3054.1992.tb04680.x.

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29

Miyamoto, Kensuke, Ryoichi Yamamoto, Shuhei Fujii, Kouichi Soga, Takayuki Hoson, Toru Shimazu, Yoshio Masuda, Seiichiro Kamisaka, and Junichi Ueda. "Growth and Development in Arabidopsis thaliana through an Entire Life Cycle under Simulated Microgravity Conditions on a Clinostat." Journal of Plant Research 112, no. 4 (December 1999): 413–18. http://dx.doi.org/10.1007/pl00013865.

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30

Heathcote, D. G., and B. W. Bircher. "Enhancement of phototropic response to a range of light doses in Triticum aestivum coleoptiles in clinostat-simulated microgravity." Planta 170, no. 2 (February 1987): 249–56. http://dx.doi.org/10.1007/bf00397895.

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31

Link, Bruce M., and Daniel J. Cosgrove. "Analysis of Peg Formation in Cucumber Seedlings Grown on Clinostats and in a Microgravity (Space) Environment." Journal of Plant Research 112, no. 4 (December 1999): 507–16. http://dx.doi.org/10.1007/pl00013907.

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32

KNIGHT, C. D., and D. J. COVE. "The polarity of gravitropism in the moss Physcomitrella patens is reversed during mitosis and after growth on a clinostat." Plant, Cell and Environment 14, no. 9 (December 1991): 995–1001. http://dx.doi.org/10.1111/j.1365-3040.1991.tb00970.x.

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33

Saiki, Mizue, Hiroshi Fujita, Kouichi Soga, Kazuyuki Wakabayashi, Seiichiro Kamisaka, Masamichi Yamashita, and Takayuki Hoson. "Cellular basis for the automorphic curvature of rice coleoptiles on a three-dimensional clinostat: possible involvement of reorientation of cortical microtubules." Journal of Plant Research 118, no. 3 (June 2005): 199–205. http://dx.doi.org/10.1007/s10265-005-0210-x.

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34

Lorenzi, Giovanna, and Gerald Perbal. "Root growth and statocyte polarity in lentil seedling roots grown in microgravity or on a slowly rotating clinostat." Physiologia Plantarum 78, no. 4 (April 1990): 532–37. http://dx.doi.org/10.1111/j.1399-3054.1990.tb05238.x.

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35

Brown, Allan H., David K. Chapman, Anders Johnsson, and David Heathcote. "Gravitropic responses of the Avena coleoptile in space and on clinostats. I. Gravitropic response thresholds." Physiologia Plantarum 95, no. 1 (January 1995): 27–33. http://dx.doi.org/10.1111/j.1399-3054.1995.tb00803.x.

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36

Johnsson, Anders, Allan H. Brown, David K. Chapman, David Heathcote, and Christina Karlsson. "Gravitropic responses of the Avena coleoptile in space and on clinostats. II. Is reciprocity valid?" Physiologia Plantarum 95, no. 1 (January 1995): 34–38. http://dx.doi.org/10.1111/j.1399-3054.1995.tb00804.x.

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37

Aarrouf, Jawad, Chantal Demandre, Nicole Darbelley, Claude Villard, and Gérald Perbal. "Development of the primary root and mobilisation of reserves in etiolated seedlings ofBrassica napus grown on a slowly rotating clinostat." Journal of Plant Physiology 160, no. 4 (January 2003): 409–13. http://dx.doi.org/10.1078/0176-1617-00857.

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38

Miyamoto, Kensuke, Tomoki Hoshino, Masamichi Yamashita, and Junichi Ueda. "Automorphosis of etiolated pea seedlings in space is simulated by a three-dimensional clinostat and the application of inhibitors of auxin polar transport." Physiologia Plantarum 123, no. 4 (April 2005): 467–74. http://dx.doi.org/10.1111/j.1399-3054.2005.00472.x.

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39

Villacampa, Alicia, Ludovico Sora, Raúl Herranz, Francisco-Javier Medina, and Malgorzata Ciska. "Analysis of Graviresponse and Biological Effects of Vertical and Horizontal Clinorotation in Arabidopsis thaliana Root Tip." Plants 10, no. 4 (April 9, 2021): 734. http://dx.doi.org/10.3390/plants10040734.

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Clinorotation was the first method designed to simulate microgravity on ground and it remains the most common and accessible simulation procedure. However, different experimental settings, namely angular velocity, sample orientation, and distance to the rotation center produce different responses in seedlings. Here, we compare A. thaliana root responses to the two most commonly used velocities, as examples of slow and fast clinorotation, and to vertical and horizontal clinorotation. We investigate their impact on the three stages of gravitropism: statolith sedimentation, asymmetrical auxin distribution, and differential elongation. We also investigate the statocyte ultrastructure by electron microscopy. Horizontal slow clinorotation induces changes in the statocyte ultrastructure related to a stress response and internalization of the PIN-FORMED 2 (PIN2) auxin transporter in the lower endodermis, probably due to enhanced mechano-stimulation. Additionally, fast clinorotation, as predicted, is only suitable within a very limited radius from the clinorotation center and triggers directional root growth according to the direction of the centrifugal force. Our study provides a full morphological picture of the stages of graviresponse in the root tip, and it is a valuable contribution to the field of microgravity simulation by clarifying the limitations of 2D-clinostats and proposing a proper use.

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40

Aarrouf, J., D. Schoëvaërt, R. Maldiney, and G. Perbal. "Changes in hormonal balance and meristematic activity in primary root tips on the slowly rotating clinostat and their effect on the development of the rapeseed root system." Physiologia Plantarum 105, no. 4 (April 1999): 708–18. http://dx.doi.org/10.1034/j.1399-3054.1999.105416.x.

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41

Hoshino, Tomoki, Kensuke Miyamoto, and Junichi Ueda. "Gravity-controlled asymmetrical transport of auxin regulates a gravitropic response in the early growth stage of etiolated pea (Pisum sativum) epicotyls: studies using simulated microgravity conditions on a three-dimensional clinostat and using an agravitropic mutant, ageotropum." Journal of Plant Research 120, no. 5 (August 22, 2007): 619–28. http://dx.doi.org/10.1007/s10265-007-0103-2.

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42

Losinska-Sičiūnienė, Regina, Ramunė Stanevičienė, and Danguolė Švegždienė. "Effects of UVA and its simultaneous action with blue light on the growth and phototropism of cress leaves under various gravity conditions." Biologija 66, no. 2 (June 13, 2020). http://dx.doi.org/10.6001/biologija.v66i2.4257.

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The gravity of the Earth (1g) and phototropic active components of the light spectrum are the stimuli regulating the directional growth of plants. In this study, the role of combined light and gravity effects on plant leaves (Lepidium sativum L.) was tested. Treatment with UVA (370 nm) or UVA combined with blue light together with the gravity in the slow clinostat (clinorotated 3 rpm), or Earth’s gravity (1g), was applied. A custom-built clinostat with LEDs allowed unidirectional illumination of cress leaves. UVA or UVA with blue light was directed laterally at cress leaves for a 3 h exposure. Responses of cotyledons and true leaves, both under 1g and clinorotation conditions, were compared. The obtained data show that UVA (370 nm) suppresses the elongation of cotyledons and true leaves under changed gravity of the Earth. Clinorotation suppresses the growth of cotyledons but not of the true leaves under UVA with blue light. Comparison of leaf phototropism induced by different illuminations under1g and changed gravity conditions revealed that phototropism was induced by clinorotation but suppressed by Earth’s gravity. Phototropic responses of true leaves under clinorotation were stronger than those of cotyledons.

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Xu, Huiyun, Jiawei Wu, Yuanyuan Weng, Jian Zhang, and Peng Shang. "Two-dimensional clinorotation influences cellular morphology, cytoskeleton and secretion of MLO-Y4 osteocyte-like cells." Biologia 67, no. 1 (January 1, 2012). http://dx.doi.org/10.2478/s11756-011-0161-8.

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Abstract:

AbstractThe aim of this study was to investigate the effects of the clinostat-simulated weightlessness on biological characteristics of MLO-Y4 osteocyte-like cells. MLO-Y4 cells were incubated for 24 h, then randomly divided into 3 groups and rotated in a clinostat as a model of simulated weightlessness for 12 h, 24 h and 48 h. The morphology, cytoskeleton, and secretion of soluble molecules of MLO-Y4 cells were observed and detected. The results show that clinostat culture affects the number of dendrites/cell, cytoskeleton distribution, and secretion of nitric oxide and prostaglandin E2 in MLO-Y4 cells. These results may provide some clue to explore the cellular mechanism of bone loss caused by weightlessness.

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Sailer, H., P. Nick, and E. Sch�fer. "Inversion of gravitropism by symmetric blue light on the clinostat." Planta 180, no. 3 (February 1990). http://dx.doi.org/10.1007/bf00198789.

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Miyamoto, Kensuke, Takahiro Yamasaki, Eiji Uheda, and Junichi Ueda. "Analysis of apical hook formation in Alaska pea with a 3-D clinostat and agravitropic mutant ageotropum." Frontiers in Plant Science 5 (April 8, 2014). http://dx.doi.org/10.3389/fpls.2014.00137.

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Medina, Brenda, and Cesar Rodríguez. "Análisis gravitrópico de la raíz primordial de plantas mesoamericanas, en condiciones de microgravedad simulada." Portal de la Ciencia, December 22, 2017, 73–96. http://dx.doi.org/10.5377/pc.v12i0.5518.

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Abstract:

Esta investigación muestra datos del crecimiento y curvatura gravitrópica de seis especies de importancia actual para el área Mesoamericana, Paseolus vulgaris var. Criolla, Paseolus vulgaris var. Amadeus 77, Phaseolus lunatus Phaseolus acutifolious, Vigna unguiculata y Sorghum bicolor; bajo condiciones de microgravedad simulada en clinostato de un eje, así como cortes histológicos de los tejidos de las muestras clinorotadas y las muestras Control 1g.Tiene como objetivo comprender el comportamiento de la raíz primordial de plantas actualmente cultivadas en Mesoamérica, cuando la fuerza neta sobre la vertical es menor que la fuerza gravitacional; Esto con la intención de identificar las especies vegetales que pudieran tener un crecimiento óptimo a baja gravedad.Las pruebas de laboratorio se llevaron a cabo en las instalaciones de la Facultad de Ciencias Espaciales UNAH. Sembrando en discos de Petri con un sustrato llamado agar y dentro de cámaras húmedas para mantener iguales condiciones de humedad y temperatura. Luego de germinadas las raíces se procedió al proceso de clinorotación de la muestra llamada “Clinorotada” (sometida a microgravedad) durante sesiones de dos horas; tomando fotografías cada treinta minutos para su posterior análisis de comparación. Los datos fueron analizados mediante el programa ImageJ, y tabulados mediante Excel.Phaseolus lunatus, Vigna unguiculata y Soghum bicolor son tres especies en las que se pudo observar que su crecimiento no ha sido considerablemente afectado a baja gravedad. Por lo que son especies que podrían ser consideradas para mayores estudios en microgravedad a bordo de sondas espaciales.Revista Portal de la Ciencia, No. 12, junio 2017; 73-96

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