玉米种子发芽和幼苗生长对水分环境十分敏感 ,低活力种子比高活力种子更敏感 .水分环境影响玉米种子吸收水分的速度 .不同水分条件下玉米种子发芽速度有显著差异 ,胚根伸长最早的在吸水 30 h左右 ,种子发芽最迟的在吸水 90 h以后 ,且发芽率显著下降 ;胚根伸长时的种子含水量在 30 %～ 6 5 %内变化 .发芽 3～ 7d的幼苗长度与发芽过程中胚的含水量呈显著正相关 ,芽的生长比根的生长对水分更敏感 .玉米种子在水分过多的环境中发芽 ,蛋白酶活性显著升高 ,淀粉酶活性显著下降 ,酶活动平衡受到严重影响 Maize seed germination and seedling growth are very sensitive to the water environment, the low-vigor seed is more sensitive than the high-vigor seed.The water environment affects the speed of corn seed absorbing moisture.The seed germination speed of corn seedling under different water conditions is significantly different, After absorbing water for 30 h, seed germination was delayed at the latest 90 h after water absorption, and the germination rate decreased significantly. The seed moisture content in radicle elongation varied from 30% to 65% The embryo moisture content was significantly and positively correlated during germination, and the growth of buds was more sensitive to water than the growth of roots.These seeds germinated in the environment with too much water, the protease activity increased significantly, the amylase activity decreased significantly, and the enzyme activity balance Seriously affected