库源改变对新疆高产棉花14C-同化物分配及内源激素含量的影响

以新陆早13号棉花为材料,在皮棉产量2500kg·hm-2以上的膜下滴灌条件下,于花铃期分别进行1/2、1/4剪叶和1/2、1/4疏蕾处理,研究库源改变对叶片14C-同化物运转分配及内源激素含量的影响.结果表明,疏库处理降低了主要源叶(对应的主茎叶和对位果枝叶)中吲哚乙酸(IAA)峰值,推迟了异戊烯基腺嘌呤及其核苷(i...

EFFECTS OF SOURCE AND SINK MANIPULATION ON DISTRIBUTION OF 14C-ASSIMILATE AND ENDOGENOUS HORMONE CONTENTS OF HIGH-YIELD COTTON IN XINJIANG

Effects of leaf cutting and bud thinning treatment on partitioning of 14C-assimilate and endogenous hormone contents of source leaf （respective axial leaf and sympodian leaf）during flowering and boll setting stage in high yield cotton were studied by using Gossipium hirsutum L. cv. Xinluzao13 as plant material. Results showed that bud thinning reduced the peak value of indole-3-acetic acid （IAA） delayed the accumulation of isopenteny ladenime and its riboside（iP+iPA）, and decreased the contents of abscisic acid（ABA）zeatin and its riboside（Z+ZR）of source leaf. Thus, the export and partitioning of percentage of 14C-assimilate in boll was significantly decreased at full bolling and boll opening stages. As a result, both of boll weight and yield in bud thinning were significantly lower than control. Leaf cutting significantly improved the content of cytokinins(CTKs) and the distributive percentage of 14C-assimilates in boll. Furthermore, when leaves were cutted 1/4 at anthesis, no differences were found in number of bolls per plant, boll weight and yield compared with control.These results suggested that regulating source sink relation with key practices of cultivation would be of great importance to super high and stable yield of cotton, as it would affect the changes of endogenous hormone levels and regulate the distribution of 14C-assimilate between source and sink.