Abstract
AbstractFloral 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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