Studies on the Influence of Photoperiod and Temperature on Floral Traits in Buckwheat (Fagopyrum esculentum Moench) under Controlled Stress Conditions |
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| Authors: | S Lachmann T Adachi |
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| Institution: | S. Lachmann;, Dr. T. Adachi, Applied Genetics and Biotechnology Division, Faculty of Agriculture, Miyazaki University, Miyazaki 889—21 (Japan). |
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| Abstract: | Floral traits of three Japanese and one European buckwheat varieties were studied in a phytotron under three photoperiods (short-day 10/14 h, long-day 14/10 h, extreme long-day 18/6 h) and two thermoperiods (25/20, and 15 °C constant temperature). The Japanese varieties showed a strong delay in flowering under prolonged day length, whereas one European variety reacted almost day-neutral. Also affected by the photoperiod were the number of flower clusters as well as their sizes. A constant low temperature of 15 °C led to a strong delay in flowering under short- and long-day in all the varieties tested. In particular, the Japanese varieties were sensitive to temperature, developing more flower clusters under high temperature. Furthermore the experiments revealed complex genotype/pliotopenod/thermoperiod interactions. The study, conducted to investigate the causes of low seed-set observed in buckwheat, offered some suggestions for new breeding strategies. Insensitive genotypes, showing less sensitivity to photoperiod as well as to thermoperiod, should be included in further buckwheat improvement. |
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| Keywords: | Fagopyrum esculentum buckwheat phytotron photoperiod thermoperiod floral |
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