关键词: 核桃, 一氧化氮(NO), 干旱胁迫, 保护酶, 膜透性

Abstract:

This paper studied the effects of NO donor sodium nitroprusside (SNP) on improving walnut(Juglans regia) drought resistance. The one-year-old grafting walnut plants were treated by SNP of 0,250,500,1 000 μmol·L^-1 . The results showed that SNP treatment was able to alleviate the rise of membrane permeability and accelerate the accumulation of proline in walnut leaves under drought stress. After SNP treatment, both SOD activity and CAT activity increased. After recovering growth, the membrane permeability and MDA content of plants treated with SNP were significantly lower than those of grafting plants supplied with normal water, while the proline content was higher than that of grafting plants supplied with normal water. Both SOD activity and CAT activity were higher than those of grafting plants in drought control and similar to those supplied with normal water. This indicated that the SNP had a function of protecting walnut plants from being harmed by drought stress. In particular, the effect of 500 μmol·L^-1 SNP was more significant, 250 μmol·L^-1 SNP and 1 000 μmol·L^-1 SNP followed.

Key words: walnut(Juglans regia), nitric oxide (NO), drought stress, protective enzymes, membrane permeability