油初始坐果机制研究

Studies on the Mechanism of Initial Fruit Set in Younai(Prunus salicina Lindl var.)

以成年油木奈树为材料,对其初始坐果进行了研究。结果表明,盛花后2周内,油木奈出现大量的落花落果;幼果(子房)低水平的GA1+3与油木奈的落花落果高峰关系密切,而内源细胞分裂素ZRs和[diH]ZRs以及ABA与幼果(子房)的生长呈显著的正相关;初始坐果期,油木奈的雌配子体发育缓慢,且有相当数量的胚囊中途退化、败育,无法正常受精,从而导致其大量的落花落果。文中就油木奈的初始坐果机制进行了讨论。

Some aspects on the initial fruit set in Younai （Prunus salicina Lindl var. cordata J Y Zhang et al） were studied. The results showed that, large amount of flower/fruitlet drop occurred within 2 weeks after full blossom; low content of GA1＋3 was closely correlated to the peak of fruit drop, however, the contents of endogenous zeatin ribosides （ZRs）, dihydrozeatin ribosides （[diH]ZRs） and abscisic acid （ABA） were significantly positive correlated to the growth of fruitlet （ovary）; during the initial fruit set of Younai, quite a few of female gametophytes degenerated or aborted, and, the developmental process was slow after anthesis, which therefore, blocked fertilization and resulted in flower/fruitlet abscission. The mechanism of initial fruit set in Younai was discussed in this paper.