The effects of methyl jasmonate (MeJA, Nippon Zeon Co., Ltd, Tokyo, Japan) on germination and the degradation of storage reserve in rice （Oryza sativa L.） seeds were studied. There were dual effects of MeJA on seed germination and seedling growth of rice, low concentration of MeJA promoted germination and seedling growth whereas high concentration of MeJA inhibited germination and seedling growth. The optimal concentration of promotion was 5×10-7 mol/L. The acid phosphatase activity, α-amylase activity, degradation of starch and salt-soluble proteins were affected same as germination by MeJA. MeJA inhibited the degradation of glutelins, the higher the concentration, the higher the extent of inhibition above 5×10-7 mol/L.The results showed that either promotion or inhibition of germination by MeJA was very close to the effect on the activity of α-amylase. The mechanisms between abscisic acid and MeJA affection on seed germination and seedling growth were compared.
茉莉酸甲酯对水稻种子萌发和贮藏物质降解的影响
宾金华* 黄胜琴 何树春 贺立红 潘瑞炽
（华南师范大学生物系，广州510631）
摘要：茉莉酸甲酯 (methyljasmonate ,MeJA)对水稻 (Oryzasativa L .)种子萌发及幼苗生长的作用表现出“双重性”效应 ,低浓度促进种子萌发和幼苗生长 ,最适浓度为 5× 10 -7mol/L ,高浓度作用相反。MeJA对水稻萌发胚乳酸性磷酸酶、α-淀粉酶、淀粉和盐溶蛋白降解作用也如此 ,但它抑制谷蛋白降解。实验结果表明 ,MeJA促进和抑制水稻种子萌发都与α-淀粉酶活性有关。讨论了MeJA对种子萌发作用与ABA作用的异同
关键词： 茉莉酸甲酯；水稻种子；萌发；贮藏物质降解
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