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PHOTOPERIOD SENSITIVITY DURING SOYBEAN FLOWER DEVELOPMENT

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概要 Flowering in field-grown soybean [Glycine max (L.) Merr.] is difficult to pre-dict because the influences of photoperiod (P) and temperature are not well understood. The purpose of this research was t...o improve our understanding of how the photoperiod-sensitive and -insensitive phases of flower devel-opment are controlled by P. Controlled -environment studies were conducted in which 'Johnston' (maturity group VIII) soybean plants were switched from Ps between 12h and 14.75h to a P of 22h. All chambers were maintained at 25±1℃. The P experienced by plants before they were switched to 22h did not influence the length of the photoperiod-sensitive phase of flower development for P≤13.5h. For P>13.5h, there was a linear increase in the number of days needed for P to cause flower induction (i. e. irreversible flower devel-opment) as P increased. The length of the photoperiod-insensitive phase also showed an increase when P during the photoperiod-sensitive phase was >13.5h. One of the reasons why it has been so difficult to predict flowering times in soybean is because the P experienced during the photoperiod-sensitive phase of flower development also affects the length of the photoperiod-insensitive phase.続きを見る

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登録日 2009.04.22
更新日 2015.11.06