铝胁迫对大豆幼苗根系形态和生理特性的影响

采用砂培法研究了不同铝浓度条件下, 2个大豆品种(浙春3号和华春18)幼苗根系形态特征和生理特性的变化.结果表明:低浓度(50mg/L)的铝促进大豆根系长度、根系体积、根系表面积和根系活力的增加,降低根系细胞质膜透性,对大豆生长有一定的促进作用;高浓度的铝(5000mg/L)明显抑制根系长度的增长,使根系直径显著增大,降低大豆根系活力,使根系细胞质膜透性大大增加,明显不利于大豆的生长发育.2个大豆品种对铝胁迫存在着一定的差异,浙春3号对铝毒胁迫的耐受能力要强于华春18.

The effect of aluminum stress on morphological and physiological characteristics of soybean root of seedling

The effect of aluminum stress on morphological and physiological characteristics of soybean root of seedling was studied under different treatments of Al (aluminum) (0, 50, 500, 5 000mg/L) with the sand culture method. Two soybean varieties, Zhechun No.3 and Huachun No.18, were employed. The results indicated that low Al (50mg/L) promoted growth of soybean by increasing of the total root length, total surface area, total volume and root activity and decreasing of the membrane permeability of the root cells. High Al (5 000mg/L) restrained growth of soybean by significantly inhibiting root elongation, thickening of soybean root diameter, reducing root activity and greatly increasing membrane permeability of the root cells. Resistance to Al stress between two varieties of soybeans was different; Zhechun No.3 soybean was more tolerant to Al stress than Huachun No.18 soybean.