关于苹果的早期落果,目前比较清楚的一点是要脱落的果实在离开树体前6～10天就停止了生长,而且其种子数比正常果实的种子要少,赤霉素及细胞激动素的活性也低。因此,可以认为早期落果与种子内生长调节物质的活性高低及果实之间养分的竞争力大小有关。但是,种子数多的果实也有脱落的,并且养分的竞争不仅仅是在果实间,在生长旺盛的新梢与果实之间也会发生,并可认为它是早期落果的原因之一。赤霉素与细胞激动素是果实发育初划不可 As for the early fall of apple, it is clearer that the fruit to be shed should stop growing 6 to 10 days before leaving the tree, and its seed number is less than that of the normal fruit. The gibberellin and cytokinin Activity is also low. Therefore, it can be considered that the early fall fruit and seed growth regulators in the level of activity and the competitiveness of fruits between the size of the relevant. However, the seeds with more seeds also fall off, and the competition for nutrients occurs not only between fruits, between the growing shoots and the fruits, but also as one of the reasons for the early fall. Gibberellins and cytokinin are the primary targets of fruit development