Sites of ethylene production in the pollinated and unpollinated senescing carnation (Dianthus caryophyllus) inflorescence
Sites of ethylene production in the pollinated and unpollinated senescing carnation (Dianthus caryophyllus) inflorescence
复制标题
授粉和未授粉衰老康乃馨（石竹）花序中乙烯的产生位点
作者：
R. Nichols
香石竹授粉和未授粉花花柱、子房和花瓣内源乙烯的产生。被测量。在18°C的水中老化的切割的未授粉花的乙烯产生速率很低，直到花瓣萎蔫开始时，乙烯在所有组织中发生快速激增。乙烯的产生主要来自花柱和花瓣。未授粉的、正在衰老的花的花瓣基部比上部更快甚至更早地产生乙烯。丙烯处理切花，乙烯类似物，加速花瓣萎蔫，促进内源乙烯产生的所有花组织。授粉后2-3天内，完整花的授粉也促进了内源乙烯的产生，加速了花瓣的萎蔫。尽管这些数据与乙烯在花柱授粉和花瓣枯萎之间形成联系的假设一致，但在未授粉的花中，花柱和花瓣可以在花瓣不可逆转地枯萎时彼此独立地进化出大量乙烯。结果进行了讨论有关乙烯在花衰老中的作用。
Production of endogenous ethylene from the styles, ovary and petals of pollinated and unpollinated flowers of Dianthus caryophyllus L. was measured. The rate of ethylene production of cut, unpollinated flowers aged in water at 18°C was low until the onset of petal wilting, when a rapid surge of ethylene occurred in all tissues. The flower ethylene production was evolved mostly from the styles and petals. The bases of petals from unpollinated, senescing flowers evolved ethylene faster and sometimes earlier than the upper parts. Treatment of cut flowers with propylene, an ethylene analogue, accelerated wilting of flower petals and promoted endogenous ethylene production in all flower tissues. Pollination of intact flowers also promoted endogenous ethylene production and caused accelerated petal wilting within 2–3 days from pollination. Although the data are consistent with the hypothesis that ethylene forms a link between pollination of the style and petal wilting, in the unpollinated flower the style and petals can evolve a surge of ethylene independently of each other, about the time when the petals irreversibly wilt. The results are discussed in relation to the role of ethylene in flower senescence.