化学
过氧化氢酶
谷胱甘肽
谷胱甘肽还原酶
抗氧化剂
抗坏血酸
衰老
脂质过氧化
一氧化氮
生物化学
硝普钠
茉莉酸甲酯
丙二醛
过氧化物酶
超氧化物歧化酶
谷胱甘肽过氧化物酶
水杨酸
酶
食品科学
生物
有机化学
基因
细胞生物学
作者
Kuo Tung Hung,Ching Huei Kao
标识
DOI:10.1078/0176-1617-01178
摘要
In the present study, we evaluate the protective effect of nitric oxide (NO) against senescence of rice leaves promoted by methyl jasmonate (MJ). Senescence of rice leaves was determined by the decrease of protein content. MJ treatment resulted in (1) induction of leaf senescence, (2) increase in H2O2 and malondialdehyde (MDA) contents, (3) decrease in reduced form glutathione (GSH) and ascorbic acid (AsA) contents, and (4) increase in antioxidative enzyme activities (ascorbate peroxidase, glutathione reductase, peroxidase and catalase). All these MJ effects were reduced by free radical scavengers such as sodium benzoate and GSH. NO donors [N-tert-butyl-alpha-phenylnitrone (PBN), sodium nitroprusside, 3-morpholinosydonimine, and AsA+NaNO2] were effective in reducing MJ-induced leaf senescence. PBN prevented MJ-induced increase in the contents of H2O2 and MDA, decrease in the contents of GSH and AsA, and increase in the activities of antioxidative enzymes. The protective effect of PBN on MJ-promoted senescence, MJ-increased H2O2 content and lipid peroxidation, MJ-decreased GSH and AsA, and MJ-increased antioxidative enzyme activities was reversed by 2-(4-carboxy-2-phenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide, a NO-specific scavenger, suggesting that the protective effect of PBN is attributable to NO released. Reduction of MJ-induced senescence by NO in rice leaves is most likely mediated through its ability to scavenge active oxygen species including H2O2.
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