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1 影响发芽率的几点主要因素1.1 水稻种子裂颖对发芽率的影响由于不育系的固有特征,开颖角度比较大,受精后部分颖花闭颖不密,有的甚至半开颖,一般组合占12%～20%,这些种子充实度差,颖壳闭合程度差,胚部裸露面大,部分米粒呈圆锥体,往往生活力较弱。杂交稻制种田授粉时间较长,灌浆期较短,种子成熟度不一致,造成种子活力差异大,发芽率偏低。再者杂交水稻种子颖壳开裂(或萌动过)使种子内米粒与空气接触面积增大,造成呼
1 affect the germination rate of several major factors 1.1 cracked rice seed germination rate of the germplasm due to the inherent characteristics of sterile lines, opening angle is relatively large, part of the spikelets after fertilization is not close, and some even half open, The common combination accounts for 12% ~ 20%. These seeds are poor in fullness, with poor closure of the glume shell. The embryos have a large exposed surface and some of the rice grains are conical, often with weak vitality. The hybrid rice has a long pollination time, short grain filling period and inconsistent seed maturity, resulting in large difference in seed vigor and low germination rate. Moreover hybrid rice seed glume cracking (or sprouting) so that the seeds in contact with the air increased the area, resulting in call