‘粤引无核荔’退化果形成原因初探

Primary Studies on the Formation of Stunted Fruit in‘Yueyin Wuheli’Litchi

对‘粤引无核荔’(LitchichinensisSonn.‘YueyinWuheli’)正常果和退化果果皮的内源激素进行测定,同时比较正常果和退化果结果母枝叶片中的碳水化合物。结果表明,在谢花后56d和66d,正常果果皮中的IAA/ABA、GA1+3/ABA、iPAs/ABA值均高于退化果;在谢花后56d,正常果结果母枝叶片的淀粉含量高于退化果;在谢花后66d,正常果结果母枝的蔗糖含量高于退化果。认为退化果中IAA、GA和细胞分裂素与ABA的比值处于相对低的水平,以及退化果结果母枝叶片碳水化合物水平相对较低可能是退化果形成的原因。

Phytohormone levels of peels in normal and stunted fruits of‘Yueyin Wuheli’Litchi were determined. The carbohydrate contents in the two kinds of bearing shoots were also determined in order to investigate the formation of stunted fruit. The results showed that values of IAA/ABA, GA_(1+3)/ABA and iPAs/ABA in normal fruits after 56 d and 66 d of anthesis were higher than those in stunted fruits. Starch content of leaves in bearing shoot of normal fruits after 56 d of anthesis, and sucrose content after 66 d of anthesis were higher than those of stunted fruits. It suggested that low levels of the rations of IAA, GA, cytokinin with ABA, as well as low levels of carbohydrate in stunted fruits might be the causes for the formation of stunted fruit.