水分胁迫下葡萄叶片中几种物质含量的变化

以两个抗旱性不同的葡萄幼树为试材，测定了水分胁迫期间叶片中甜菜碱、可溶性糖及其组分、游离氨基酸和有机酸含量的变化。结果表明，水分胁迫下葡萄叶片中可溶性糖和游离氨基酸含量增加，并且随着胁迫程度的增加持续上升。抗旱性较强的龙眼葡萄比抗旱性较弱的晚红葡萄增加的幅度更大。水分胁迫对葡萄叶片中可溶性糖的影响主要是增加了肌醇、果糖和葡山甘(葡萄糖 山梨醇 甘露醇)的含量。在水分胁迫过程中，抗旱性不同的两个葡萄品种叶片中甜菜碱和有机酸含量始终处于很低的水平，没有观察到显著的变化。

Changes in the Contents of Some Osmoprotectants in Grape Leaves under Water Stress

Changes in the contents of betaine, soluble sugars, free amino acids and organic acids in the leaves of the young grapevine plants (Vitis vinifera L.) during water stress were investigated. The results showed that the contents of both soluble sugars and free amino acids increased in the grape leaves under water stress, moreover, that they continuously increased as water stress was developing. Compared with drought-sensitive Red Globe grapevine, the contents of both soluble sugars and free amino acids in the leaves of drought-resistant Long Yan grapevine increased to a greater extent. Under moderate water stress, the contents of inositol, fructose, and glucose + sorbitol + mannitol increased in the leaves of Long Yan grapevine plants, especially, the inositol content enhanced almost 1.5-fold. Throughout water stress, the content of both betaine and organic acids were rather low.