Effect of shoot bending on endogenous auxin and cytokinin levels in buds, and its possible relationship to flower bud formation in Japanese pear
Effect of shoot bending on endogenous auxin and cytokinin levels in buds, and its possible relationship to flower bud formation in Japanese pear
复制标题
芽弯曲对芽中内源生长素和细胞分裂素水平的影响及其与日本梨花芽形成的可能关系
DOI：
10.17660/actahortic.2004.653.6
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Kashimura
中科院分区：
文献类型：
--
作者：
A. Ito;H. Yoshioka;H. Hayama;Y. Kashimura
茎部弯曲（30-45°）加速了日本梨的花发育，研究表明，这种花发育的加速伴随着侧芽内源激素水平的显著变化。7月中旬竖直枝侧芽中吲哚-3-乙酸（IAA）浓度增加，弯曲枝中IAA浓度基本保持不变。另一方面，芽中玉米蛋白型细胞分裂素的浓度在弯曲的芽中高于垂直的芽。此外，当抗生长素马来酰肼（2,600 mg L-1）施用于梨芽时，侧芽中的玉米素、玉米苷和异戊烯腺苷含量升高，而异戊烯腺苷含量降低。因此，芽部组织中生长素水平和/或活性的降低可能是导致侧芽中生物活性细胞分裂素浓度升高的原因。这些内源激素的变化可能参与了侧芽发育的加速。
Shoot bending (30-45°) is known to accelerate flower development in Japanese pear, and here it is shown that this acceleration of flower development is accompanied by notable changes in endogenous hormone levels in the lateral buds. Indole-3-acetic acid (IAA) concentration in the lateral buds on vertical shoots increased in mid-July, but that in the bent shoot remained nearly constant. On the other hand, the concentrations of zeatin-type cytokinins in buds were higher in bent shoots than vertical shoots. Additionally, when maleic hydrazide, an anti-auxin, was applied to the pear shoots at 2,600 mg L-1, zeatin, zeatinriboside, and isopentenyladenine levels in lateral buds were increased whereas isopentenyladenosine concentration was decreased. Thus, it is supposed the depletion of the level and/or the activity of auxin in shoot tissues is responsible for the increase of bioactive cytokinin concentration in lateral buds. It is proposed that these changes of endogenous hormones may be involved in the acceleration of the lateral bud development.