大豆“短青春期”品种的光（温）反应研究：Ⅱ．对短日照的反应

在分析“短青春期”品种对播季反应的基础上，通过比较不同品种出苗至开花数与开花至成熟天数对短日处理的反应，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，开花前短光照处理，“短青春期”品种中豆24和巨丰出苗至开花天数仅缩短2－14d，敏感度较小，与春大豆型品种相似，而与典型夏大豆品种，秋大豆品种和“长青春期”品种明显不同，中豆24和巨丰的出苗至开花天数对短光照不敏感。同为“短青春期”品种的中豆24和巨丰，其开花至成熟天数对短日处理的反应有明显差异，并者与春大豆相似，而后者的开花至成熟天数的短日照敏感不仅大于复大豆，而且也大于秋大豆。生育前期对短日照不敏感的品种，其短日处理效应在生育后期表现更加明显。本文还讨论了不同品种短日处理后效应的传递特征。

Response of short juvenility soybean varieties to photoperiods Ⅱ. Response to short daylength

Eight soybean varieties were used to observe the response of days from emergence to flowering and days from flowering to maturity, under artificial photoperiod treatments, after the response to different sowing dates of these varities was studied. The objectives were to identify the characteristic of response of short juvenility varieties to photoperiods. The results under short daylength treatments showed that sensitivity to short daylength of short juvenility varieties, Zhongdou No.24 and Jufeng, was similar to that of spring soybean cultivars, Aijiaozao and Taixingheidou, the days from emergence to flowering (Ve-R 1) was short and insensitive. But their length and short daylength sensitivity to days from flowering to maturity (R 1-R 8) of two varieties was different, Zhongdou No.24 was similar to two spring soybean cultivars, but Jufeng was higher than all other varieties. The length and sensitivity of Ve-R 1 and R 1-R 8 of short juvenility varieties under short daylength were different from that of summer soybean, autumn soybean and long juvenility varieties.