Flowering Response of Mustard(Brassica juncea L.) to Temperature and Photoperiod under Field Conditions.

概要

論文の詳細を見る
Experiments were conducted to investigate the developmental responses of mustard to temperature and photoperiod under natural field conditions at Tsukuba, Japan. Fifteen cultivars/lines of diverse origin were studied at six different times, i.e., April, July, August, September, December, 1995 and February, 1996 all the year round. The days from sowing to bolting initiation and first flowering were observed for each cultivar/line at each sowing date. The mean daily temperatures and photoperiods varied within the ranges of -4.1 to 32.7°C and 9.7 to 14.6 hr, respectively during the experimental periods. Oilseed cultivars from Pakistan, India, China, etc. required 30 to 78 days for the first flowering, while among Japanese cultivars, days from sowing to first flowering ranged from 40 to 272 days. It was concluded that none of the oilseed cultivars from Pakistan, India, China, etc. responded to either low temperature or photoperiod for flower initiation and performed as day-neutral plants. Two Japanese vegetable cultivars, 'Katsuona'and'Ooba-takana'responded to day length for flowering when sown in the months of July and August. Similarly, in'Negarashina', 'Hakarashina'and'Kikarashina', flowering was delayed till next spring, when sown in October and December probably due to short days and retarded growth in winter.
日本熱帯農業学会の論文