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Functional Plant Biology
Mayer, E.S., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Ben-Michael, T., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Kimhi, S., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Forer, I., Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Rabinowitch, H.D., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel
Kamenetsky, R., Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Garlic (Allium sativum L.) cultivars do not develop fertile flowers and seeds. Therefore, garlic production and improvement depend exclusively on vegetative propagation. Recent advances in garlic research have enabled fertility restoration and the discovery of fertile and male-sterile genotypes; however, the environmental regulation of the reproductive process is still not clear. Garlic seeds are successfully produced in the Mediterrenean region, where the photoperiod is relatively short, whereas spring and summer temperatures are high. We hypothesise that, in bolting garlic, various stages of florogenesis are differentially regulated by temperature and that high temperatures might obstruct pollen production. The effects of eight combinations of controlled growth temperatures on fertile and male-sterile garlic clones were studied. In both genotypes, a gradual temperature increase before and during anthesis favoured intact flower development. Surprisingly, continuous exposure to moderate temperatures during the entire growth period resulted in poor flowering, anther abortion and reduced pollen production. In the male-sterile genotype, no growth regime improved pollen production, which is controlled by genetic mechanisms. In the male-fertile genotype, gradual temperature increase supported pollen production but a sharp transition to high temperatures resulted in rapid flower senescence and pollen abortion, thus supporting our research hypothesis. In both fertile and male-sterile plants, the most vulnerable phase of microsporogenesis is the unicellular microspore stage. Tapetal malformation is the major cause for malnutrition of the microspores, with consequent production of nonviable pollen grains. © CSIRO 2015.
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תנאי שימוש
Effects of different temperature regimes on flower development, microsporogenesis and fertility in bolting garlic (Allium sativum)
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Mayer, E.S., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Ben-Michael, T., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Kimhi, S., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel, Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Forer, I., Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Rabinowitch, H.D., Robert H. Smith Institute of Plant Science and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food, and Environment, Hebrew University of Jerusalem, Rehovot, Israel
Kamenetsky, R., Institute of Plant Science, Agricultural Research Organisation, Volcani Center, Bet Dagan, Israel
Effects of different temperature regimes on flower development, microsporogenesis and fertility in bolting garlic (Allium sativum)
Garlic (Allium sativum L.) cultivars do not develop fertile flowers and seeds. Therefore, garlic production and improvement depend exclusively on vegetative propagation. Recent advances in garlic research have enabled fertility restoration and the discovery of fertile and male-sterile genotypes; however, the environmental regulation of the reproductive process is still not clear. Garlic seeds are successfully produced in the Mediterrenean region, where the photoperiod is relatively short, whereas spring and summer temperatures are high. We hypothesise that, in bolting garlic, various stages of florogenesis are differentially regulated by temperature and that high temperatures might obstruct pollen production. The effects of eight combinations of controlled growth temperatures on fertile and male-sterile garlic clones were studied. In both genotypes, a gradual temperature increase before and during anthesis favoured intact flower development. Surprisingly, continuous exposure to moderate temperatures during the entire growth period resulted in poor flowering, anther abortion and reduced pollen production. In the male-sterile genotype, no growth regime improved pollen production, which is controlled by genetic mechanisms. In the male-fertile genotype, gradual temperature increase supported pollen production but a sharp transition to high temperatures resulted in rapid flower senescence and pollen abortion, thus supporting our research hypothesis. In both fertile and male-sterile plants, the most vulnerable phase of microsporogenesis is the unicellular microspore stage. Tapetal malformation is the major cause for malnutrition of the microspores, with consequent production of nonviable pollen grains. © CSIRO 2015.
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