种子引发对水分胁迫下大豆幼苗生理特性的影响

试验研究了种子引发处理对弱抗旱"晋豆19号"和强抗旱"晋大53号"两个大豆品种种子膜透性、可溶性蛋白含量、种子发芽指标的影响及在干旱胁迫下大豆幼苗生理特性的变化.结果表明:种子引发处理使两个大豆品种种子的膜透性显著降低,可溶性蛋白含量显著升高,且不同程度地提高了两个品种的发芽势、发芽率、发芽指数和活力指数;幼苗在水分胁迫加重时(6～9 h),与未引发处理比,引发处理下两个品种幼苗叶片膜透性减小,MDA含量降低,SOD、POD活性和脯氨酸、可溶性蛋白含量升高.表明对种子进行引发处理,通过提高幼苗保护酶活性、脯氨酸和可溶性蛋白含量,增强了大豆幼苗的耐旱性.试验还表明,引发处理对弱抗旱品种"晋豆19号"产生的耐早效应优于强抗旱品种"晋大53号".

Effect of seed priming on physiological characteristics of soybean seedling under water stress

The effects of seed priming on seed membrane permeability, soluble protein content, seed germination index and seedling physiological properties of two soybean varieties (weak drought-resistant variety "Jindou 19" and strong drought-resistant variety "Jinda 53" ) under water stress were analyzed. Results indicate that seed membrane permeability of the two varieties significantly decreases while soluble protein content increases significantly under seed priming. Meanwhile, the germination potential, germination rate, germination index and vigor index increase to some degree. When seedlings are under severe water stress (6～9h), compared with the treatments without seed priming, priming makes the seedling membrane permeability and MDA content of the two varieties significantly decrease, while makes SOD and POD activities, proline and soluble protein contents increase. This implies that seed priming improves drought tolerance of soybean seedling by increasing protective enzyme activity, proline and soluble protein contents. Furthermore, the study shows that seed priming exhibits more obvious drought-resistance-increasing effect on the weak drought-resistant variety ("Jindou 19") than on the strong drought-resistant variety ("Jinda 53").