大豆“短青春期”品种的光(温)反应研究 Ⅲ.对长日照的反应

RESPONSE OF SHORT JUVENILITY VARIETIES TO PHOTOPERIODS Ⅱ.Response to long daylength

在分析“短青春期”品种对播季和短日照反应的基础上 ,本研究通过比较不同品种出苗至开花天数与开花至成熟天数对长日处理的反应 ,以进一步明确夏大豆型“短青春期”品种的光 (温 )敏感性特征。研究结果表明 :春播条件下 ,开花前 16小时长光照使“短青春期”品种中豆 2 4和巨丰的出苗至开花天数分别延长 19天和 30天 ,是供试品种类型中对长日照最敏感的类型 ;开花前长日照处理 ,开花至成熟天数两个“短青春期”品种间表现差异较大 ,中豆 2 4有所延长 ,而巨丰则有所缩短。开花前短日 +开花后长日处理 ,中豆 2 4和巨丰的开花至成熟天数均较春大豆明显延长 ,但小于秋大豆。通过 30天和 60天的长日照处理可以发现 ,长日处理结束后 ,中豆 2 4和巨丰植株需分别接受 7- 9天和 15 - 18天的短光照 ,才能开花和进入结实期。中豆 2 4出苗至开花天数在长日下的温度敏感度高于春大豆品种 ,而巨丰出苗至开花天数的温度敏感度极小。

s Including two short juvenility varieties, eight soybean varieties were used to observe the response of days from emergence to flowering (Ve-R 1) and days from flowering to maturity(R 1-R 8), under artificial photoperiod treatment, after the response to different sowing dates and short day-length of these varieties was studied. The objects were to identify the characteristic of response of short juvenility varieties to photoperiods. The results under long day-length treatment showed that the days form emergence to flowering of two short juvenility varieties, Zhongdou No. 24 and Jufeng, were most sensitive to long day-length among all eight soybean cultivars. But the long day-length sensitivity to days from flowering to maturity of the two varieties was different. The number of days from R 1 to R 8 of Zhongdou No.24 was elongated, that of Jufeng was shortened. Through the response analysis of short juvenility varieties to 30 d and 60 d long day-length, it was observed tha 7-9 d and 15-18 d short photoperiods were need respectively for the two varieties to flower after long photoperiod. The temperature sensitivity of Ve-R 1 of short juvenility varieties Jufeng under long daylength was different from that of Zhongdou No.24.