杂交水稻繁殖和制种,收获期遇雨种子易吸水造成穗上发芽,以至降低产量,影响杂交水稻的推广。虽然国际GB3543中规定已发芽种子作废种处理,但在异常缺种年份,如能将芽种合理利用,则可减少一定的经济损失。水稻种子发芽是指胚芽和胚根伸长而突破颖壳的发育过程。胚芽的伸长过程是芽鞘先伸长,随之不完全叶和第一叶原基伸长。一般芽鞘可伸长1～2厘米,当 Hybrid rice breeding and seed production, harvesting rain seeds easily absorbed water spikes on the sprout, and even reduce the yield, affecting the promotion of hybrid rice. Although the international GB 3543 stipulates that the germinated seeds should be disposed of as waste seeds, the economic losses can be reduced if the buds can be used reasonably in the year of absenteeism. Rice seed germination refers to the germination and radicle elongation and break through the development of glume shell. Germ elongation process is first bud elongation, followed by incomplete leaf and the first leaf primordia elongation. General bud sheath can be extended 1 to 2 cm, when