不同遮光胁迫对大豆生长发育进程及形态性状的影响

Study of the Influence of Shading Stress to the Development Stages and the Form Characters of Soybean

通过遮光处理,研究不同遮光强度及持续时间对大豆的生育进程和形态性状的影响,结果表明,大豆播种后遮光20%￣50%,时间持续到V3期以后,大豆各生育阶段所需生育日数减少,生育期缩短。遮光20%时间持续到V3以后,遮光30%时间持续到R1以后,遮光50%时间持续到R5以后,大豆生育期显著或极显著缩短。同一遮光持续时间,遮光强度的加强会导致R5-R8生育日数增加,使大豆生育期(VE-R8)延长。遮光强度及遮光持续时间对大豆株高、子叶节高度、茎粗和主茎节数影响显著。遮光50%持续到R5期以后,植株形态由直立变成蔓生型。

According to studying the influence of shading intension and shading duration to the development and the form characters of soybean. The results showed that, shading 20%-50% from seeding to Third-node stage and to the later developing-stage, the days of all developing-stage were shortened, and the days from seedling to maturing were shortened too. Shading 20% from seeding to third-node stage and to the later developing-stage, shading 30% from seeding to flowering and to the later developing- stage, shading 50% from seeding to filling and to maturing, the days from seedling to maturing decreased significantly. In the same shading period, with the increasing of the shading intensity, the days from filling to maturing, the days from seedling to maturing increased. The effect on shading intensity and shading duration to four characters （plant height, cotyledon node height, number of nodes on main stem and diameter of main stem） of soybean was significant. Bearing shading 50% from seeding to filling and to harvesting, the form of soybean varied significantly, the growth of plant became sprawling.