Changes of Endogenous Hormones in Different Organs during the Flowering Phase of Moso Bamboo

QI Fei-yan; PENG Zhen-hua; HU Tao; GAO Jian

Endogenous hormone contents of indole-3-acetic acid (IAA), gibberellin A3 (GA3), abscisic acid (ABA) and zeatin riboside(ZR)were measured by enzyme-linked immunosorbent assay(ELISA)in leaves, inflorescence, branches, stems and rhizomes of flowering and non-flowering moso bamboo(Phyllostachys edulis), for discussing the differences and understanding the relation between endogenous hormones distribution and contents and flower’s morphological differentiation. The results showed that: in comparison with non-flowering moso bamboo, the content of IAA in the leaves, branches and stems of flowering bamboo in Heading stage(mid-June)reduced significantly, and the content of ABA in the branches brought down significantly too, but the content of ZR in stems increased significantly. The content of IAA in the branches of flowering bamboo in flowering period(mid-July)was lower significantly and the content of GA3 rose significantly. The distribution characters of hormone in different organs were found different, while that of IAA was stem>rhizome>branch>inflorescence, that of GA3 was inflorescence>rhizome>branch>stem, that of ZR was inflorescence>branch>stem>rhizome and that of ABA was stem>branch>inflorescence>rhizome. The content of IAA in secondary side branches was significantly lower than that in primary side branches, but the contents of GA3 and ZR were higher than that in the primary side branches. The contents of IAA, GA3 and ABA in bamboo stem increased basipetally, while that of ZR in stem decreased basipetally. High rates of ABA, ZR and GA3 and low proportion of IAA may be helpful to the flower development during flower development, because ABA, ZR and GA3 had higher proportion in Heading stage and flowering period.

1. International Centre for Bamboo and Rattan, Key Laboratory on the Science and Technology of Bamboo and Rattan, Beijing 100102, China

Received Date: 2012-07-19

Abstract: Endogenous hormone contents of indole-3-acetic acid (IAA), gibberellin A3 (GA3), abscisic acid (ABA) and zeatin riboside(ZR)were measured by enzyme-linked immunosorbent assay(ELISA)in leaves, inflorescence, branches, stems and rhizomes of flowering and non-flowering moso bamboo(Phyllostachys edulis), for discussing the differences and understanding the relation between endogenous hormones distribution and contents and flower’s morphological differentiation. The results showed that: in comparison with non-flowering moso bamboo, the content of IAA in the leaves, branches and stems of flowering bamboo in Heading stage(mid-June)reduced significantly, and the content of ABA in the branches brought down significantly too, but the content of ZR in stems increased significantly. The content of IAA in the branches of flowering bamboo in flowering period(mid-July)was lower significantly and the content of GA3 rose significantly. The distribution characters of hormone in different organs were found different, while that of IAA was stem>rhizome>branch>inflorescence, that of GA3 was inflorescence>rhizome>branch>stem, that of ZR was inflorescence>branch>stem>rhizome and that of ABA was stem>branch>inflorescence>rhizome. The content of IAA in secondary side branches was significantly lower than that in primary side branches, but the contents of GA3 and ZR were higher than that in the primary side branches. The contents of IAA, GA3 and ABA in bamboo stem increased basipetally, while that of ZR in stem decreased basipetally. High rates of ABA, ZR and GA3 and low proportion of IAA may be helpful to the flower development during flower development, because ABA, ZR and GA3 had higher proportion in Heading stage and flowering period.

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Reference (19)

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Changes of Endogenous Hormones in Different Organs during the Flowering Phase of Moso Bamboo

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