花生种子内源ABA含量变化及其与活力的关系

花生（Ａｒａｃｈｉｓ ｈｙｐｏｇａｅａ Ｌ．）种子发育过程中，胚轴内源ＡＢＡ 含量一直是增加的；种皮内源ＡＢＡ含量在果针入土后４０ ｄ 最大，然后急剧下降；子叶内源ＡＢＡ 含量在果针入土后６０ ｄ 出现高峰，然后有轻微下降。种子活力指数和萌发时内源ＡＢＡ 的净下降量有密切关系。甘露醇可促进离体胚内源ＡＢＡ 合成，１－甲基－３－苯基－５（３－［三氟甲基］－苯基－４－（１氢）－吡啶）抑制子叶内源ＡＢＡ 的合成，子叶和胚轴存在不同的ＡＢＡ 合成途径。种子早熟和早萌处理时，内源ＡＢＡ 含量都下降，胚轴在种子由发育向萌发转换中起着十分重要的作用

CHANGES OF ENDOGENOUS ABA CONTENT IN RELEVANCE TO THE VIGOR OF PEANUT SEEDS

During the development of peanut (Arachis hypogaea L.) seed,the endogenous ABA content increased steadily in hypocotyl,increased to a peak at 40 d after pegging with a drastic decline afterwards in testa;and in cotyledon,increased to a peak at 60 d after pegging but with a slight fall afterwards.There seemed to be a close relationship between the increase of vigor index and net loss of endogenous ABA content in the peanut seed germinating in vitro.Osmoticum (mannitol) promoted the endogenous ABA in the cotyledon and hypocotyl,and Fluridone inhibited that in the cotyledon.There were two different paths of the endogenous ABA synthesis in peanut seed, C 40 in the cotyledon and C 15 in the hypocotyl.When peanut seeds were put in the conditions of precocious maturation or germination,the endogenous ABA content fell down.Result from this experiment concluded that the hypocotyl played an important role in the transition from development to germination of peanut seed.