The roles of abscisic acid and ethylene in the abscission and senescence of cocoa flowers
The roles of abscisic acid and ethylene in the abscission and senescence of cocoa flowers
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DOI：
10.1023/a:1006153502897
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发表时间：
1999-03-01
影响因子：
4.2
通讯作者：
Ng, E
中科院分区：
文献类型：
--
作者：
Aneja, M;Gianfagna, T;Ng, E
可可花的寿命有限，90%以上的未授粉花在开花后32小时内脱落。落叶前脱落酸(ABA)水平显著升高。到开花后21h，ABA水平增加了近10倍，32h时，ABA水平是开花时的20倍。氟烷酮完全抑制了ABA的增加、离区的形成以及花的脱落和衰老。开花后21h乙烯释放量略有增加，32h后乙烯释放量仅为对照的2倍。在可可花中，ABA是脱落的主要调节器；乙烯促进脱落，但只有在ABA存在的情况下。开花期用萘乙酸(NAA)处理能阻止离区形成和花脱落，但不能诱导座果。6天后，NAA处理的花朵除花梗外，其余部位均衰老。NAA+AVG处理仅延缓了花朵衰老，而氟烷酮处理则完全延缓了花朵衰老。
Cocoa flowers have a limited period of longevity; more than 90% of unpollinated flowers abscised within 32 h after anthesis. Abscisic acid (ABA) levels increased significantly prior to abscission. By 21 h after anthesis, ABA levels had increased almost 10-fold, and by 32 h flowers had 20-fold higher levels of ABA than at anthesis. Fluridone completely inhibited both the increase in ABA, the formation of an abscission zone, and the abscission and senescence of flowers. In contrast, ethylene production increased only slightly 21 h after anthesis and was only 2-fold higher after 32 h. Aminoethoxyvinylglycine (AVG) delayed but did not prevent abscission. In cocoa flowers, ABA is the primary regulator of abscission; ethylene accelerates abscission but only in the presence of ABA. Naphthalene acetic acid (NAA) treatment of flowers at anthesis prevented abscission zone formation and flower abscission, but did not induce fruit set. All parts of the NAA-treated flower except the pedicel senesced after 6 days. NAA+AVG treatment only delayed, whereas fluridone treatment completely prevented flower senescence.