【摘要】 在水分胁迫下大豆幼苗叶片相对水分含量(RWC)和光合速率下降,细胞质膜透性、脯氨酸(Pro)含量和气孔阻力均增大;缺钙与供钙植株相比,其RWC和光合速率更低,膜透性改变剧烈,特别是Pro增加2～3倍,缺钙处理下光合速率的进一步降低,可能由非气孔因素所致。实验结果表明钙对改善植物的水分状况、提高膜的稳定性和植株抗旱性具有重要作用。更多还原

【Abstract】 Under water stress, relative water content ( RWC ) and photo-synthetic rate decrease. Plasma membrance permeability, proline (Pro) content and stomatal diffusion resistance increase. RWC and photosynthetic rate in Ca-deficit treated seedlings were lower than those in Ca-rich seedlings. Membrance permeability changed greatly and pro increased 2-3 times as compared with that in Ca-rich seedlings. The free Pro accumulation was also found in Ca-deficit treated seedlings. Under water strees, the photosynthetic rate decreasing in Ca-deficit seedlings mainly depends on the non-stomatal factor. The experimental results suggested that Ca play an important role in improving water status, maintaining membrane stability and plant drought-resistance.更多还原