豇豆种子萌芽期及幼苗期耐湿性能的比较

Comparison of Waterlogging Tolerance of Cowpea in Seed Germination Stage and Seedling Stage

目的比较豇豆萌芽期及幼苗期的耐湿性能,指导豇豆播种实践。方法在豇豆种子萌芽期及幼苗期分别进行淹水处理,研究不同时期豇豆种苗对缺氧胁迫的生理生化响应。结果 (1)随着豇豆种子淹水时间延长,萌发率明显降低,在36 h后,成苗率为0,在幼苗期淹水处理,72 h仍无幼苗死亡,但生理生化指标变化明显;(2)淹水抑制豇豆幼苗生长,其中对根的伤害最大。结论豇豆萌芽期比幼苗期对淹水耐受能力低,种子萌动期涝害会严重影响萌发,导致烂种,因此选择播种土壤环境和雨后播种非常重要。

Objective Waterlogging tolerance of seed germination stage and seedling stage in cowpea （ Vigna unguiculata ） were compared, to guide the practice of seeds sowing. Methods The germination cowpea seeds and cowpea seedlings were soaked in water with different time （ 12,24,36,48,60,72 h ）, and their responses to hypoxia stress were studied. Results （ 1 ） As the flooding time prolonged, the germination of seed decreased. When the cowpea in germination stage was flooded over 36 h, the seedling rate was zero, but when the cowpea in seedling stage was flooded less than 72 h, no seedling death was observed ; （2） Under flooding stress, the growth of cowpea seedlings was inhibited, and the damage of root was the most serious. Conclusion The wet resistant ability of cowpea in seedling stage was stronger than that in germination stage. The waterlogging in germination stage influence the germination and cause rotting away of seeds, it is important to choose the seeding enviroment and time.