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生长素与乙烯对兰花授粉后花发育的调节作用 |
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he production of ethylene which in turn regulates perianth senescence, and the development of the ovary and male gametophyte (Zhang and O'Neill 1993). Others have proposed a role for auxin in stimulating the postpollination developmental responses. Müller (1953) showed that orchid pollen contained auxin. Subsequent works demonstrated that auxin can induce the same developmental syndrome as does pollination (Burg and Dijkman 1967, Arditti and Knauft 1969, Arditti and Flick 1976). Thus, it has been suggested that in orchids, auxin may play an important role in mediating the effects of pollination (Zhang and O'Neill 1993).
Despite numerous studies on pollination-induced responses, such as eth-ylene production and flower senescence, most of the works have been done on detached flowers, especially in orchids (Burg and Dijkman 1967, Arditti and Knauft 1969, Arditti and Flick 1976, O'Neill et al．1993). In this study, we address the question of how similar the postpollination responses in detached flowers are to those in attached ones. We will present results that in Doritaenopsis flowers, there are few detectable differences between detached and attached flowers in their postpollination responses regulated by ethylene, except in the accumulation of ACC synthase and ACC oxidase mRNAs in the ovary. We have also used 2［(1-naphthalenylamino) carbonyl］benzoic acid (NPA), an auxin transport inhibitor (Goldsmith 1977), to show that auxin supplied by the pollen and pollen tube is required for normal ovary development.
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