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Dissertations / Theses on the topic 'Pollen viability'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Viner, Brian J. "Predicting the dispersion and viability of maize pollen." [Ames, Iowa : Iowa State University], 2007.

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2

Oliveira, Aline de. "Fixação de frutos no meloeiro : viabilidade polínica, receptividade estigmática e protocolos de polinização. /." Jaboticabal, 2019. http://hdl.handle.net/11449/191110.

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Orientador: Leila Trevisan Braz<br>Resumo: Polinizações manuais na cultura do meloeiro apresentam taxa de sucesso de cerca de 40%, entretanto, pouco se relata na literatura sobre os aspectos que afetam esta taxa, tornando-a baixa, e como incrementa-la. Este trabalho teve por objetivo estudar a biologia reprodutiva do meloeiro, e estratégias para aumentar a taxa de pegamento de frutos na cultura. Para tal, foram estudados a viabilidade polínica e receptividade estigmática em genótipos de meloeiro ao longo do dia da antese, e, o impacto de diferentes protocolos de polinização na fixação de fruto
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3

Soveral, Marta de Agrela Cabral. "Fatores que afetam o vingamento em oliveira (Olea europaea L.) cv. Tosca: efeito da polinização cruzada e da aplicação de um extrato de algas." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8303.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>Aiming at an improvement of fruit set in olive tree cv. Tosca, a very early flowering variety, a field trial involving artificial cross pollination was carried out in a hedgerow olive orchard nearby Cartaxo, with pollinators 'Negrinha', 'Cordovil', 'Azeiteira' and 'Maçanilha', early flowering cultivars as well (free pollination as control), and with five other pollinators, 'Arbequina', 'Carrasquenha', 'Galega Evora', 'Maçanilha Carrasquenha' and 'Blanqueta', later flowering, on an exploratory basis. The viability and pollen
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Safdar, Misbah. "Fruit yield and quality of okra (Abelmoschus esculentus (L.) Moench) evaluated under high-temperature stress." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20698.

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Okra is a nutritious vegetable that belongs to the family Malvaceae. It is widely grown in the tropical, sub-tropical, temperate and Mediterranean regions of the world. However, little evidence of the impacts of high temperature stress on various physiological, morphological, biochemical and metabolic processes is available for okra nor is the extent of genetic variation known. This study characterized and evaluated 176 diverse okra germplasm under constant high temperature to assess morphological and physiological changes to growth and development and to identify molecular markers linked to h
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Silva, Lucielio Manoel da. "Elementos do sistema reprodutivo de etnovariedades de batata-doce, provenientes do Vale do Ribeira, SP, Brasil." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-13052008-111105/.

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O presente trabalho teve por objetivos avaliar o sistema reprodutivo de etnovariedades de batata-doce, mais especificamente, determinar quais genótipos são autocompatíveis e quais são compatíveis ou incompatíveis entre si. O sistema reprodutivo foi avaliado em 13 etnovariedades de batata-doce, através da frutificação e da observação in situ dos tubos polínicos no pistilo através da técnica de epifluorescência com azul de anilina, em flores submetidas a polinização controlada. Teste de viabilidade dos grãos de pólen foi realizado usando os corantes carmim acético e cloreto de tetrazólio em quat
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Cuchiara, Cristina Copstein. "Conservação à baixa temperatura e avaliação da viabilidade de grãos de pólen de mamoneira." Universidade Federal de Pelotas, 2010. http://repositorio.ufpel.edu.br/handle/ri/2040.

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Made available in DSpace on 2014-08-20T13:59:12Z (GMT). No. of bitstreams: 1 dissertacao_cristina_cuchiara.pdf: 54838030 bytes, checksum: 080d5f9c1d6101f82e129f93588c1a24 (MD5) Previous issue date: 2010-03-19<br>The castor bean (Ricinus communis L.) it is known by the high adaptation capacity to the different climate conditions and soil, characteristics these that it possible be her cultivated commercially in different areas of Brazil. Consequently, researches about conservation and germination of the pollen are indispensable to the programs of genetic improvement. The purpose is to ev
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Chanon, Ann Marie. "Studies on the reproductive capacity of Aesculus parviflora and Aesculus pavia opportunities for their improvement through interspecific hybridization /." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1118692145.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xx, 305 p.; also includes graphics. Includes bibliographical references (p. 278-305). Available online via OhioLINK's ETD Center
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8

Mesa, Laura A. "The influence of pollinator diversity and behaviour on pollen movement in Brassica rapa chinensis (Pak-Choi) crops, and its significance for gene escape." Thesis, University of Canterbury. School of Biological Sciences, 2008. http://hdl.handle.net/10092/2685.

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The overall aim of the study was to assess the risk of gene flow from Brassica crops by insectmediated pollen transport. I measured the viability of pollen in Brassica flowers throughout crop development and compared this with the viability of pollen transported by insects inside and outside one early- and one late-season crop. In order to evaluate the relative importance of different species in pollen transport, I measured abundance of flower visitors during crop development, and measured the foraging behaviour of five key pollinator species throughout the growing season, in relation to varia
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9

Nora, Gracieli Dalla. "Caracterização citogenética de cultivares de feijão (phaseolus vulgaris l.)." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/5059.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The meiotic behavior and estimation of pollen viability were studied in seven cultivars of common bean (Phaseolus vulgaris L.), which were IAPAR 44, Guapo Brilhante, BRS Expedito, BRS Valente, Guateian 6662, Pérola e Iraí. Floral buds were collected from cultivars, fixed and stored under refrigeration for the preparation of slides by squashing technique anthers and coloring with acetic orceína 2% and reactive Alexander. It was tried to obtain the greatest possible number of cells of each stage of meiosis. The estimation of pollen v
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Dibos, Chloé. "Interactions plante - pollinisateur : caractérisation de la qualité du pollen de deux cucurbitacées durant son ontogenèse, sa présentation et son transport sur le corps de l'abeille domestique." Phd thesis, Université d'Avignon, 2010. http://tel.archives-ouvertes.fr/tel-00587581.

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Chez de nombreuses Angiospermes, la pollinisation croisée est nécessaire pour le succès de la reproduction. La plupart de ces plantes ont évolué afin de favoriser la pollinisation entomophile, principalement assurée par les abeilles. C'est le cas des Cucurbitacées, dont le melon (Cucumis melo L.), importante culture du sud de la France et le concombre d'âne (Ecballium elaterium (L.) A. Rich.) plante spontanée endémique du bassin méditerranéen, les deux modèles de cette étude. Afin de mieux comprendre les relations plante-pollinisateur,nous avons choisi de caractériser le couple pollen de Cucur
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França, Leomara Vieira de. "Fatores ambientais na produção de sementes de híbridos interespecíficos de brachiaria." Universidade Federal de Pelotas, 2011. http://repositorio.ufpel.edu.br/handle/ri/1509.

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Made available in DSpace on 2014-08-20T13:44:47Z (GMT). No. of bitstreams: 1 tese_leomara_vieira_franca.pdf: 1162787 bytes, checksum: 8a5d01449a80429de1597fab8c180921 (MD5) Previous issue date: 2011-04-26<br>In recent years, for most agricultural species, has increased the use of hybrids by to its high yield and other qualities that put them in front of varieties. In the genus Brachiaria hybridization has been accomplished through the use of crossing B. ruziziensis, that is sexual, and other species of the genus mainly apomictic B. brizantha and B. decumbens. However, hybrids of Brachiaria
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Couto, Marcelo. "Efeito da temperatura durante a diferenciação de gemas, floração, crescimento e desenvolvimento de frutos em pessegueiro na região de Pelotas, RS." Universidade Federal de Pelotas, 2006. http://repositorio.ufpel.edu.br/handle/ri/2122.

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Made available in DSpace on 2014-08-20T14:22:07Z (GMT). No. of bitstreams: 1 Tese_ Marcelo_ Couto.pdf: 11730472 bytes, checksum: afd142b8d56cb58f0be9327a636499ea (MD5) Previous issue date: 2006-11-27<br>Insufficient chilling accumulation limits the production of peach in subtropical areas. Comparatively this combined with the wide temperature fluctuation during bud differentiation, through the bloom period and fruit growth and development may cause crop losses. Problems with low productivity in southern Rio Grande do Sul often attributed to the mild winter conditions, however, the envi
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13

Ghanem, Ghofran. "Ausprägung wichtiger Eigenschaften für die generative Vermehrung einer gartenbaulichen Modell-Kultur unter dem Einfluss von Genotyp und Umwelt." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2011. http://dx.doi.org/10.18452/16409.

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Die vorliegende Arbeit prüft bei der gärtnerischen Modell-Kultur Cyclamen den Einfluss des Genotyps (interspezifische Hybriden) auf generative Merkmale sowie bei C. persicum `Melody´ den Einfluss von Kultivierungsmaßnahmen wie die Besiedelung der Wurzeln durch einen symbiontischen Pilz (Piriformospora indica) in Kombination mit einem differenzierten Phosphor-Angebot auf vegetative und generative Merkmale: (1) Pflanzendurchmesser, (2) Blühzeitpunkt und Blütenanzahl, (3) Anzahl Samenanlagen pro Fruchtknoten, (4) Vitalität von Pollen und Samenanlagen, (5) Mikrosporogenese, (6) Befruchtungsvorgan
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14

Silva, Carla Maria de Jesus. "Indu??o de calos em anteras e poliploidia em gen?tipos de melancia." Universidade Estadual de Feira de Santana, 2018. http://tede2.uefs.br:8080/handle/tede/tede/631.

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Submitted by Verena Pereira (verenagoncalves@uefs.br) on 2018-07-03T23:23:34Z No. of bitstreams: 1 TESE 2018 - Doutorado RGV_UEFS - Carla Maria de Jesus Silva.pdf: 1687907 bytes, checksum: 3e9fe14e189c00f951079ca2a71e3c66 (MD5)<br>Made available in DSpace on 2018-07-03T23:23:34Z (GMT). No. of bitstreams: 1 TESE 2018 - Doutorado RGV_UEFS - Carla Maria de Jesus Silva.pdf: 1687907 bytes, checksum: 3e9fe14e189c00f951079ca2a71e3c66 (MD5) Previous issue date: 2018-03-29<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES<br>The watermelon (Citrullus lanatus) is a very important
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15

Marceau, Alexis. "Pollinisation inter-parcellaire chez le maïs: analyse et coupage des processus conditionnant la présence du pollen viable en fonction de la distance à la source." Phd thesis, AgroParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00555879.

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La coexistence de parcelles de maïs implique des transferts de pollen inter-parcellaire, sous l'action du vent, qui peuvent altérer la pureté des productions en grains ou être le vecteur de dissémination de transgènes. Pour limiter ces transferts, différents isolements spatiaux sont préconisés (distances, barrières polliniques). Cependant, aucun outil n'est à disposition des professionnels pour estimer l'efficacité de ces isolements. Ma thèse, réalisée à l'INRA (UMR EGC, Grignon, 78) et financée par une bourse CIFRE en partenariat avec Arvalis - Institut du végétal, entreprend de compléter et
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16

Alami, Sophia. "Action de stress physiques (froid, obscurité) sur le développement et la viabilité du pollen de plusieurs variétés de sorgho-grain : incidence sur le métabolisme des acides nucléiques dans les méiocytes et le tapis." Toulouse, INPT, 1988. http://www.theses.fr/1988INPT004A.

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Une relation étroite existe entre la longueur de la graine de la feuille-drapeau, la taille des anthères et les stades de l'ontogenèse pollinique chez le sorgho. L'obscurité seule ou associée au froid réduit le taux d'accroissement des paramètres étudiés sans interdire lé développement du gamétophyte mâle qui se poursuit jusqu'à la formation d'un pollen de taille réduite. L'action du stress réduit la teneur en DNA nucléaire des méiocytes de la variété Chouan ; la réduction est maximale après 24 heures à 5ʿC en photopériode normale. La mitose obligatoire du tapis est bloquée et, de plus, la ten
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17

Alami, Sophia. "Action de stress physiques, froid, obscurité, sur le développement et la viabilité du pollen de plusieurs variétés de sorgho-grain incidence sur le métabolisme des acides nucléiques dans les méiocytes et le tapis /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611128g.

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18

Yu, Chih-Ying, and 游之穎. "Papaya pollen viability and the possibility of the existence of 2n pollen." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43686735676164177276.

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碩士<br>臺灣大學<br>園藝學研究所<br>98<br>Studying on the physiological characteristics and preservative methods of papaya pollen will be helpful for papaya breeding. Using FCR (fluorochromatic reaction) and in vitro germination assessed pollen viability of different sex types of tree, floral sex variation, flower and stamen position, and floral stage. The results indicate that the papaya pollen in vitro germination medium consisting of 10 % sucrose, 300 ppm calcium nitrate, 100 ppm boric acid resulted in better germination percentage. The pollen germination percentage and FCR test viability percentage of
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19

Chang, Cheng-huag, and 張正桓. "Studies on pollen morphology, pollen viability, pollination and fruit growth of bitter gourd (Momordica charabtia L.)." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/09568089321023771598.

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碩士<br>國立中興大學<br>園藝學系所<br>94<br>Pollen grains of 40 varieties bitter gourd (Momordica charantia L.) were examined using scanning electron microscope to observe. The view of equatorial plane on pollen is the prolate, polar view is three cracks spheroidal and has tricolporate. The sculpture of pollen exine surface is regulate, covers entirely the lumiba. The 17 of pollen surface and the sculpture of pollen exine character have be measured. The date was subjected to factor analysis with principal component solution. The contribution of first three principal components came to 81.88% of total varia
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Hu, Jeng-Rong, and 胡正榮. "Pollen Development, Pollen Viability, Fruit Set, and Seed Germination in vitro of Oncidium and Allied Genera." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/54849737876684880100.

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碩士<br>國立臺灣大學<br>園藝學研究所<br>89<br>The purpose of this research was to investigate the pollen development, pollen vaiability, fruit set, and seed germination of Oncidium and allied genera. The capsule set ratio of Oncidium and allied genera was low. In total 143 pollination combinations, 28 formed capsules were obtained. Among the capsules, there were 3 self-pollinated, 14 Oncidium interspecific cross, and 11 intergeneric cross formed capsules. There were 14 cross combinations which showed unilateral cross incompatibility. Capsules were obtained by crossing Mtdm. Pupukea Sunset ‘H&R’ w
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21

Lin, Yan-Hung, and 林彥宏. "Effect of Temperature on Pollen Viability and Pollination of Chrysanthemum." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/17589425582294808489.

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碩士<br>國立臺灣大學<br>園藝學研究所<br>89<br>Longevity of disc floret under low temperature is significantly longer than under high temperature. Longevity of disc of Dendranthema ‘小金’ is 21 days under 20/15℃, and10 days under 30/15℃. The development of Chrysanthemum is delayed under high temperature. Dendranthema ‘粉火焰’ spends two weeks from showing color to outside floret opening under 35/30℃ and one week under 25/20℃. The cultivars with close, firm, tightly incurved floret, such as ‘荷蘭白’, ’白觀音’, ’黃秀芳’, ’白冬陽’, ’橙興進之華’ bear no seed under nature condition without human pollinated, and cultivars with visible
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22

Liu, Chieh-Yin, and 劉玠吟. "Ploidy、 Pollen Viability and Crossability of Seedless Guava （Psidium guajava L.）." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/21150997386710915453.

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碩士<br>國立屏東科技大學<br>農園生產系<br>92<br>One of the promising goals of guava improvement is the breeding of seedless varieties. In order to understand the potential causes of seedlessness and to make use of this knowledge in seedless breeding and cultivation practices, studies have been undertaken to determine ploidy levels, pollen viability, fruit set, and crossability of seedless guava cultivars and lines. Two leaf types, normal and round shapes were identified in seedless guava. Cultivars displaying either leaf type were analyzed by flow cytometry to assess ploidy levels. ‘Normal-leaf’ cultivar
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23

Fang, Yu-Fu, and 方昱富. "QTL Mapping of Total Pollen Number and Pollen Viability and Expression Profiling Analysis under Moderate Heat Stress in Tomato." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/yfshz8.

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碩士<br>國立臺灣大學<br>農藝學研究所<br>106<br>High temperature reduces the fruit set rate of tomato, so does the yield. The total pollen number and the pollen viability were recognized as two major factors involving in the reduction of the fruit set rate. In this study, we measured these two traits of heat-sensitive variety CA4, heat-tolerant variety CLN1621N and their offspring population, 78 F7 recombinant inbred lines (RIL), under 30/25 °C day/night temperature. The results showed these two traits were highly correlated to the light intensity and their broad-sense heritability were from 0.3 to 0.6. In o
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Wu, Pei-Jhen, and 吳佩眞. "The Reproductive Development, Anther Dehiscence and Pollen Viability of Yard-long Bean." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/08596295965306953787.

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碩士<br>國立臺灣大學<br>園藝學研究所<br>99<br>Yard-long bean (Vigna unguiculata ssp.sesquipedalis (L.) Verdc.) thrives in warm weather with good tolerance to drought and to moisture. It has a wide range of soil adaptation and is an important summer vegetable in Taiwan. However, the crop succumbs to seed borne viral diseases and abrupt environmental changes often result in reduced pod yield and quality. Being a self-pollinated legume, yard-long bean usually has low seed set upon manual crossing. There is few report on the reproductive biology of the yard-long bean and it is essential to know the flowering an
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Lu, Hsueh-I., and 呂學義. "The structure of floral organ, pollen viability and regeneration system via micropropagation in Catharanthus roseus." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70092089765759023142.

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碩士<br>國立嘉義大學<br>農學研究所<br>98<br>This study evaluated the development of floral organ, pollen viability and in vitro plant regeneration system in Catharanthus roseus. There are five anthers lied on the top of hypanthium. The syncarpous pistil was composed of two carpels with styles and stigmas. The stigma-top has the papillae structure and along the stigma, which was able to secrete the stigmatic fluid. Ovary was located on the hypanthium base which observated had two nectarines structure. Style elongated along hypanthium upward until the stigma-top, and located beneath the anther. Inside the hy
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Kuo, Horng-Yeuan, and 郭宏遠. "Studies on Pollen Viability, Preservation and Pollination in Seed Production of Hot Pepper (Capsicum annuum L.)." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/56750217884111489804.

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博士<br>國立中興大學<br>園藝學系所<br>101<br>Hot pepper (Capsicum annuum L.) is the important spicy vegetable in the world. For commercial F1 cultivars, the variety purity and seed quality is considered to be very important. Due to the climate warming and plant variety protection, the demand of heat-tolerant lines, protection of the parental lines of hybrid variety, cut-down the cost of seed production grow up increasingly. The purpose of this study were to select the heat-tolerance lines, test the pollen quality, and storage pollen in liquid nitrogen, providing for assessing the feasibility of honeybees t
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Yang, Su-Si, and 楊素絲. "Effects of Abscisic Acid and Polyamines on Rice (Oryza sativa L.) Pollen Viability under Low Temperature." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/82138581092800655498.

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LI, HONG-XI, and 李紅曦. "Study on pollen viability assay and storage longevity of passion fruit (Passiflora edulis sims) and related species." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/53574911317412154739.

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Doyle, Jacqueline Heidi. "Determining gene flow, linkage and parental contribution in Pinus elliottii X Pinus caribaea pine hybrids." Diss., 2001. http://hdl.handle.net/2263/27551.

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Villa-Rodriguez, Sandra. "REPRODUCTIVE BIOLOGY AND FLORAL PHENOLOGY OF SICYOS DEPPEI G. DON (CUCURBITACEAE) IN DISTURBED AREAS IN THE CITY OF SAN ANDRES CHOLULA, PUEBLA, MEXICO." Thesis, 2012. http://hdl.handle.net/10214/5502.

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Sicyos deppei G. Don (Cucurbitaceae) is an invasive monoic annual tendril-bearing vine; it is endemic to Mexico, adapted to the rainfall cycle (June through the end of September) and produces spiny, single seeded fruits. Under serious infestation conditions, S. deppei grows extensively, covering native plants, crops and tree trunks. This study determined the breeding system and pollinators of S. deppei growing in three study sites at urban gardens and disturbed sites at the Campus of the Universidad de las Américas, Puebla in the city of San Andrés Cholula, Puebla (Mexico). Each female inflore
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Holcová, Magdalena. "Molekulární evoluce meiózy u diploidů a tetraploidů druhu Arabidopsis arenosa." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-356401.

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Meiosis is functionally conserved across eukaryotes, thus not expected to vary considerably among different species, and even less so among lineages within a species. However, recent studies showed that this is not necessarily the case in Arabidopsis arenosa. Genome scanning identified an excess differentiation in meiosis genes between A. arenosa diploids and tetraploids, interpreted as meiosis adaptation to the whole genome duplication in tetraploids and differentiation was also found between two diploid lineages. Thus, I present a population-based analysis of positive selection acting on mei
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