不同脱叶性甘蔗品种成熟期内源激素含量的研究

为探究甘蔗(Soccharum officinarum)内源激素与其脱叶性之间的相关性，对不同成熟期甘蔗不同叶位的叶鞘基部的脱落酸(ABA)、脱落酸葡萄糖酯(ABA-GE)、1-氨基环丙烷羧酸(ACC)和茉莉酸(JA)及相关衍生物茉莉酸-缬氨酸(JA-val)的含量进行测定。结果表明，LZ02-169品系的ABA、JA-val含量随成熟期的变化趋势与脱叶率一致；而LZ02-169的+8叶叶鞘基部ACC含量的变化趋势与脱叶率相反；成熟后期LZ02-169的+8叶叶鞘基部ABA、ABA-GE及JA-val的含量均显著高于‘GT47’。因此，甘蔗成熟后期ABA含量的升高可能加速了叶片的脱落；经由ACC转化的乙烯和JA-Val也对叶片的脱落具有促进作用。

Study on Endogenous Hormone Contents of Sugarcane Varieties with Different Defoliation at Maturity Stage

In order to research the correlation between the endogenous auxin and defoliation of sugarcane, the contents of abscisic acid (ABA), ABA-glucosyl ester (ABA-GE), 1-aminocyclopropanecarboxylic acid (ACC), jasmonic acid (JA) and related derivatives jasmonic acid-valine (JA-val) in leaf sheath bases at different positions were determined at different mature stages. The results showed that the change trends of ABA and JA-val contents in LZ02-169 with maturity were consistent with that of shedding rate, while the ACC content in +8 leaf sheath base of LZ02-169 and defoliation rate was opposite. The contents of ABA, ABA-GE and JA-val in +8 leaf sheath base of LZ02-169 at late mature stage were significantly higher than those of ''GT47''. Therefore, the increase of ABA content might accelerate the abscission of sugarcane leaves at late mature stage, and ethylene derived from ACC and JA-Val also promoted the abscission of sugarcane leaves.