不同处理对望江南种子萌发及幼苗生长的影响

Effects of different treatments on seed germination and seedling growth of Cassia occidentalis

为探究破除望江南(Cassia occidentalis Linn.)种子硬实的方法、提高望江南种子发芽率,通过浓硫酸浸种、热水浸种和干燥3种不同方式处理其种子.研究结果表明,浓硫酸处理能显著促进望江南种子萌发和幼苗生长,特别是质量分数98%浓硫酸浸种30 min,种子硬实率降为0. 0%,发芽率达到79. 00%、发芽势为76. 00%、发芽指数为99. 17,活力指数为9. 04,分别是对照组的1. 25、1. 23、1. 51和1. 91倍;子叶长、子叶宽和幼苗生物量也显著高于对照.热水浸种和干燥处理对降低望江南种子硬实率和提高种子发芽率未见明显效果,但一定程度上促进幼苗生长.热水和干燥处理温度过高会抑制望江南种子萌发和幼苗生长.

The hard seed rate of untreated Cassia occidentalis Linn.is high and the germination rate is low due to its hard seed coat.To study the effects of different treatments on seed germination and seedling growth of C.occidentalis,concentrated sulfuric acid treatment,soaking treatment with hot water,and drying treatment in high temperature were used in this experiment.The results showed that the treatment of concentrated sulfuric acid could significantly improve the seed germination of C.occidentalis.Especially the treatment with98%concentrated sulfuric acid for30min,the hard seed rate was decreased to0.0%,the germination rate was79.00%,germination potential was76.00%,germination index was99.17,vitality index of seed was9.04,which were1.25,1.23,1.51and1.91times as much as that of the control group,respectively.Cotyledon length,cotyledon width,seedling biomass were also significantly improved compared with the control.Although soaking seeds with hot water and drying treatments had no obvious effects on the seed germination of C.occidentalis,these two treatments could prominently promote the growth of seedlings.The seed germination and seedling growth of C.occidentalis could be inhibited by soaking seeds in hot water or drying while the temperature was too high.