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Hormonal regulation of postpollination development of Doritaenopsis flowers by auxin and ethylene

Zhang Xiansheng, Li Quanzi, Zheng Chengchao

Department of Plant Sciences,Shandong Agricultural University.Taian 271018,Shandong

Abstract

The regulation of postpollination development by auxin and ethylene was examined in Doritaenopsis flowers. These results showed that there were no detectable differences in pollination-induced ethylene production and pollination responses regulated by ethylene between detached and attached flowers. The effects of inhibitors of ethylene biosynthesis on early post-pollination changes confirmed that perianth senescence, ovary development, pollen germination and pollen tube growth were regulated by ethylene. It was also been found that the flowers attached to the plant did not exhibit ACC synthase and ACC oxidase gene expression in the ovary. Pretreatment of the stigma with 2[(1-naphthalenylamino) carbonyl] benzoic acid (NPA), an auxin transport inhibitor, blocked pollination-induced ovary development to a large extent, suggesting that the transport of auxin is required for normal ovary development.

Key words: Pollination;Ethylene;ACC synthase;ACC oxidase;Auxin;Development

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Citing This Article：

Zhang Xiansheng, Li Quanzi, Zheng Chengchao. Hormonal regulation of postpollination development of Doritaenopsis flowers by auxin and ethylene. Acta Physiol Sin 1999; 51 (2): (in Chinese with English abstract).