The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Jose Gabriel Segarramoragues - One of the best experts on this subject based on the ideXlab platform.
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seed germination and seedling Allogamy in rosmarinus officinalis the costs of inbreeding
Plant Biology, 2018Co-Authors: Patricio Garciafayos, Maria Clara Castellanos, Jose Gabriel SegarramoraguesAbstract:1) Self-pollination by geitonogamy is likely in self-compatible plants that simultaneously expose large numbers of flowers to pollinators. However, the progeny of these plants is often highly allogamous. Although mechanisms to increase cross-pollination have been identified and studied, their relative importance has rarely been addressed simultaneously in plant populations. (2) We used Rosmarinus officinalis to explore the factors that influence the probability of self-fertilization due to geitonogamy or that purge its consequences, focusing on their effect on seed germination and Allogamy rate. For doing this, we experimentally tested the effects of geitonogamy on the proportion of filled seeds and how it influences germination rates. Then during two field seasons, we studied how life-history and flowering traits of individuals influence seed germination and Allogamy rates of their progeny in wild populations at the extremes of the altitudinal range. The traits considered were plant size, population density, duration of the flowering season, number of open flowers, flowering synchrony among individuals within populations, and the proportion of male-sterile flowers. (3) We found that most seeds obtained experimentally from self-pollinations were apparently healthy but in fact empty, and that the presence of filled seeds drove the differences in germination rates between self- and cross-pollination experiments. Plants from wild populations consistently showed low germination rates and high rates of Allogamy as determined with microsatellites. Germination rates related positively to the length of the flowering season, flowering synchrony and the rate of male-sterile flowers whereas the rate of allogamous seedlings was positively related only to the rate of male-sterile flowers. (4) Rosemary plants purge most of the inbreeding caused by its pollination system by aborting seeds. This study showed that the rates of seed germination and of the resulting Allogamy are a function of a complex combination of factors that vary in space and time. Male sterility of flowers, length of the flowering season and flowering synchrony of individuals within populations all favor high rates of cross-pollination, therefore increasing germination and Allogamy rates. These flowering traits appear to be highly plastic and respond to local and seasonal environmental conditions.
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selfing and Allogamy in rosmarinus officinalis the role of seed abortion phenology and environmental variation
2017Co-Authors: Patricio Garciafayos, Maria Clara Castellanos, Jose Gabriel SegarramoraguesAbstract:Trabajo presentado en la XIV MEDECOS (Mediterranean Ecological Society) & XII AEET Meeting (Asociacion Espanola de Ecologia Terrestre). Human driven scenarios for evolutionary and ecological changes, celebrado en Sevilla (Espana) del 31 de enero al 4 de febrero de 2017
Jean Koechlin - One of the best experts on this subject based on the ideXlab platform.
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The reproductive biology of okra. 2. Self-fertilization kinetics in the cultivated okra (Abelmoschus esculentus), and consequences for breeding
Euphytica, 1991Co-Authors: Serge Hamon, Jean KoechlinAbstract:The use of Cruden's index (1977), for studying okra sexual reproductive allocations, indicates a facultative autogamy mode. The purpose of the research described is to obtain more accurate information on the self-fertilization process. For this, self-pollen grain germination was stopped at different times of the day. Twelve varieties of Abelmoschus esculentus were used. Self-fertilization kinetics—expressed by the setting rate—displayed an increase between 7.00 to 16.00 hr. Study of obtained progenies, by stimulated Allogamy, confirmed the process and showed that allo-pollen grains deposited on a stigma after midday had only a very little chance of contributing to fertilization. As a result, the polymorphism of the flower structure and particularly the distance between anther and stigmas, insect types and movement habits play major roles in governing okra Allogamy. We also show that self-fertilization kinetics can be used to improve controlled hybrid production.
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The reproductive biology of okra. 1. Study of the breeding system in four Abelmoschus species
Euphytica, 1991Co-Authors: Serge Hamon, Jean KoechlinAbstract:The breeding system of Abelmoschus species is not well known. Although being self-compatibles Allogamy reaches 63%. The aim of the study was to place four Abelmoschus species on the log P/O scale devised by Cruden (1977). On this scale P = pollen grains per anther × anthers per flower and O = ovules production. Pollens and ovules productions were therefore assessed for 68 accessions of two cultivated species, A. esculentus and A. caillei, and two wild, A. manihot and A. moschatus. Extreme log P/O values ranged from 1.69 for the variety Clemson Spineliss (A. esculentus) to 2.94 for ORS 278 (A. manihot). Averages of wild species A. moschatus (2.17) and A. manihot (2.19) indicate facultative autogamy. Averages for cultivated species A. esculentus (2.00) and A. caillei (2.05) suggest more autogamy.
Patricio Garciafayos - One of the best experts on this subject based on the ideXlab platform.
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seed germination and seedling Allogamy in rosmarinus officinalis the costs of inbreeding
Plant Biology, 2018Co-Authors: Patricio Garciafayos, Maria Clara Castellanos, Jose Gabriel SegarramoraguesAbstract:1) Self-pollination by geitonogamy is likely in self-compatible plants that simultaneously expose large numbers of flowers to pollinators. However, the progeny of these plants is often highly allogamous. Although mechanisms to increase cross-pollination have been identified and studied, their relative importance has rarely been addressed simultaneously in plant populations. (2) We used Rosmarinus officinalis to explore the factors that influence the probability of self-fertilization due to geitonogamy or that purge its consequences, focusing on their effect on seed germination and Allogamy rate. For doing this, we experimentally tested the effects of geitonogamy on the proportion of filled seeds and how it influences germination rates. Then during two field seasons, we studied how life-history and flowering traits of individuals influence seed germination and Allogamy rates of their progeny in wild populations at the extremes of the altitudinal range. The traits considered were plant size, population density, duration of the flowering season, number of open flowers, flowering synchrony among individuals within populations, and the proportion of male-sterile flowers. (3) We found that most seeds obtained experimentally from self-pollinations were apparently healthy but in fact empty, and that the presence of filled seeds drove the differences in germination rates between self- and cross-pollination experiments. Plants from wild populations consistently showed low germination rates and high rates of Allogamy as determined with microsatellites. Germination rates related positively to the length of the flowering season, flowering synchrony and the rate of male-sterile flowers whereas the rate of allogamous seedlings was positively related only to the rate of male-sterile flowers. (4) Rosemary plants purge most of the inbreeding caused by its pollination system by aborting seeds. This study showed that the rates of seed germination and of the resulting Allogamy are a function of a complex combination of factors that vary in space and time. Male sterility of flowers, length of the flowering season and flowering synchrony of individuals within populations all favor high rates of cross-pollination, therefore increasing germination and Allogamy rates. These flowering traits appear to be highly plastic and respond to local and seasonal environmental conditions.
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selfing and Allogamy in rosmarinus officinalis the role of seed abortion phenology and environmental variation
2017Co-Authors: Patricio Garciafayos, Maria Clara Castellanos, Jose Gabriel SegarramoraguesAbstract:Trabajo presentado en la XIV MEDECOS (Mediterranean Ecological Society) & XII AEET Meeting (Asociacion Espanola de Ecologia Terrestre). Human driven scenarios for evolutionary and ecological changes, celebrado en Sevilla (Espana) del 31 de enero al 4 de febrero de 2017
Serge Hamon - One of the best experts on this subject based on the ideXlab platform.
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Recent progress on coconut micropropagation through a joined effort involving different countries
Current Advances in Coconut Biotechnology, 1999Co-Authors: Jean-luc Verdeil, Serge Hamon, R. Hornung, H.j. Jacobsen, E.p. Rillo, Carlos Oropeza, Roland Bourdeix, Valérie Hocher, A. SangaréAbstract:Coconut is one of the most important perennial crops for the economy of intertropical countries (Persley, 1992). Thanks to breeding, high-performance hybrids can be achieved. However, conventional selection methods have some constraints derived from the features of the reproduction of these perennial plants: great variability among progeny (consequence of the Allogamy), very long selection cycle, low multiplication rate (coconut is only multiplied from seeds), and absence of natural vegetative propagation.
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The reproductive biology of okra. 2. Self-fertilization kinetics in the cultivated okra (Abelmoschus esculentus), and consequences for breeding
Euphytica, 1991Co-Authors: Serge Hamon, Jean KoechlinAbstract:The use of Cruden's index (1977), for studying okra sexual reproductive allocations, indicates a facultative autogamy mode. The purpose of the research described is to obtain more accurate information on the self-fertilization process. For this, self-pollen grain germination was stopped at different times of the day. Twelve varieties of Abelmoschus esculentus were used. Self-fertilization kinetics—expressed by the setting rate—displayed an increase between 7.00 to 16.00 hr. Study of obtained progenies, by stimulated Allogamy, confirmed the process and showed that allo-pollen grains deposited on a stigma after midday had only a very little chance of contributing to fertilization. As a result, the polymorphism of the flower structure and particularly the distance between anther and stigmas, insect types and movement habits play major roles in governing okra Allogamy. We also show that self-fertilization kinetics can be used to improve controlled hybrid production.
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The reproductive biology of okra. 1. Study of the breeding system in four Abelmoschus species
Euphytica, 1991Co-Authors: Serge Hamon, Jean KoechlinAbstract:The breeding system of Abelmoschus species is not well known. Although being self-compatibles Allogamy reaches 63%. The aim of the study was to place four Abelmoschus species on the log P/O scale devised by Cruden (1977). On this scale P = pollen grains per anther × anthers per flower and O = ovules production. Pollens and ovules productions were therefore assessed for 68 accessions of two cultivated species, A. esculentus and A. caillei, and two wild, A. manihot and A. moschatus. Extreme log P/O values ranged from 1.69 for the variety Clemson Spineliss (A. esculentus) to 2.94 for ORS 278 (A. manihot). Averages of wild species A. moschatus (2.17) and A. manihot (2.19) indicate facultative autogamy. Averages for cultivated species A. esculentus (2.00) and A. caillei (2.05) suggest more autogamy.
Bohdan Lojka - One of the best experts on this subject based on the ideXlab platform.
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Original Research Article Preliminary Study of Diversity of Plukenetia volubilis Based on the Morphological and Genetic Characteristics
2012Co-Authors: Blanka Krivankova, Petra Hlásná Čepková, Martin Ocelak, Gaelle Juton, Miroslav Bechyne, Bohdan LojkaAbstract:The aim of this study was to make an initial step in clarification of morphological diversity of sacha inchi (Plukenetia volubilis L.), a traditional oilseed crop, together with use of ISSR primers for a preliminary assessment of genetic variability in the species. Quantitave and qualitative morphological data together with leaf samples for twenty plant individuals of sacha inchi from five distinct populations were gathered in three different communities neighbouring the city of Pucallpa in Peru. Morphological data were processed into PCA analysis graph while for DNA analysis the method of fingerprinting processed into PCO graph and dendrogram was used. Visible morphological dissimilarities in the plant appearance were confirmed and observable differences in phenotypical characteristics among different types of associated cultivations were recorded. For genetic variability twelve from eighteen ISSR primers used and tested in the study could be used directly for further molecular pursuit on this species. Dendrogram with six main clusters was created and thus confirmed polymorphism as Allogamy plants shows. Obtained results contributed to the identification of suitable method for further assessment of genetic variability within this species. New horizons for the focus of further research and improvements in onward development and genetic conservation of sacha inchi cultivation were identified, thus linking the observation of morphological features with DNA analysis proved as effective.
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Preliminary Study of Diversity of Plukenetia volubilis Based on the Morphological and Genetic Characteristics
Agricultura tropica et subtropica, 2012Co-Authors: Blanka Krivankova, Petra Hlásná Čepková, Martin Ocelak, Gaelle Juton, Miroslav Bechyne, Bohdan LojkaAbstract:The aim of this study was to make an initial step in clarification of morphological diversity of sacha inchi (Plukenetia volubilis L.), a traditional oilseed crop, together with use of ISSR primers for a preliminary assessment of genetic variability in the species. Quantitave and qualitative morphological data together with leaf samples for twenty plant individuals of sacha inchi from five distinct populations were gathered in three different communities neighbouring the city of Pucallpa in Peru. Morphological data were processed into PCA analysis graph while for DNA analysis the method of fingerprinting processed into PCO graph and dendrogram was used. Visible morphological dissimilarities in the plant appearance were confirmed and observable differences in phenotypical characteristics among different types of associated cultivations were recorded. For genetic variability twelve from eighteen ISSR primers used and tested in the study could be used directly for further molecular pursuit on this species. Dendrogram with six main clusters was created and thus confirmed polymorphism as Allogamy plants shows. Obtained results contributed to the identification of suitable method for further assessment of genetic variability within this species. New horizons for the focus of further research and improvements in onward development and genetic conservation of sacha inchi cultivation were identified, thus linking the observation of morphological features with DNA analysis proved as effective.
