两种豆科作物的种子萌发对Cd^(2+)处理的不同响应

Different Responses of Seed Germination of Two Beans Under Treatment by Cd^(2+)

采用室内试验方法,研究了绿豆和箭舌豌豆的种子萌发对不同浓度Cd2+处理的响应。结果表明,较低浓度的Cd2+(低于50或100μmol·L-1)处理对这两种作物的种子发芽率和发芽系数无明显的影响,但影响其活力指数。较高浓度(大于100μmol·L-1)的Cd2+处理不仅影响两种作物的种子发芽率和发芽系数,而且还影响其活力指数,这与Cd2+处理降低蛋白水解酶活性和呼吸速率、增加膜透性等有关。相比之下,绿豆种子的萌发对Cd2+处理的响应较箭舌豌豆的明显,暗示后者在种子萌发时对Cd2+胁迫的忍耐性较强。

Different responses of seed germination physiology in mung bean and common vetch towards Cd2+ treatment were conducted with an experiment. It has been found that little effects were found for germinating rate, indexes of seed mung bean and common vetch, but vitality index of seeds were done by Cd2+ treatment at lower concentration(equal to or lower than 50 μ mol· L- 1 for mung bean; equal to or lower than 100 μ mol· L- 1 for common vetch) and germinating rates, indexes and vitality indexes of seeds of mung bean and common vetch were significantly affected by Cd2+ treatment at higher concentration. All of the above related to the decreases of proteolytic enzyme activity and respiratory rate and the increase of plasma membrane permeability. Compared with mung bean, there was less effect of Cd2+ treatment on the seed germination of common vetch. This may be suggested that the resistance of germinating seed against Cd2+ stress be stronger than that of mung bean.