不同生态类型小麦品种生长锥分化与温光的关系

本文研究了不同生态类型的七个小麦品种生长锥分化进程及其与温光的关系.结果表明:生长锥分化进程随品种类型而异,春性品种快于冬性品种,但差异最大的是单棱期至二棱初期.伸长期与日平均温度呈极显著的负相关,即温度越高,天数越短.此外,还发现伸长期存在着"积温效应".日照长度是影响单棱期至二棱初期长短的主要因素,所有品种单棱期至二棱初期的天数均与此期的平均日长呈显著的负相关,而冬性品种还与日平均温度呈正相关.高温长日加速二棱初期至雌雄蕊分化进程.

STUDY ON THE RELATEONSHIP BETWEEN INITIATION RATE OF WHEAT APEX AND PHOTOPERIOD AND TEMPERATURE

Seven wheat cultivars with different ccological type were studied on th relationship between initiation rate of wheat apex and photoperiod and temperature. The results obtained were as follows: (1) The initiaton rate of wheat apex is higher in spring habit cultivars thanin winter ones. Great difference is seen in the period of single to early double ridge. (2) The days from sowing to apex elongation showed significante negative correlation with the mean daily temperature (r = - 0.9046～- 0.8423), i.e, the higher the mean daily temperature, the shorter the days. In addition, there is "acaumulated temperature effect" in the period from sowing to apex elongation. (3) The day length is the main factor influencing the period of single ridge to early double ridge. The days from single ridge to early double ridge are negatively correlated with mean daily length in the period. Besides, this period in winter habit cultivars is positively correelated with the mean daily temperature. (4) The period of early double ridge to stamen initiation is accelerated by high temperature and longday.