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编辑同志: 秋后梨和苹果为什么还会第二次开花,并能座果? 湖北宜城县讴东公社姚崇师崇师同志: 你来信谈到的现象是存在的。据报导:热带爪哇岛栽培苹果,每年在5月和11月两次摘除全部叶片,4月和10月可采收两次苹果。这种现象的本质虽然还不十分清楚,但目前趋向认为:植物任何器官的生长和发育受促进激素(赤霉素和细胞激动素等)和抑制激素(脱落酸等)平衡变化的控制。在正常情况下,梨和苹果形成花芽以后一般保持休眠状况,直到第二年春季才开花、结果,因为有花芽的枝上,
Editor comrades: Pears and apples in autumn Why will the second flowering, and fruit can? Yizong County, Hubei Yizong commune Yao Chong division Comrade comrades: you talk about the phenomenon there. It is reported that tropical Javanese cultivated apples are harvested twice a year in May and November and twice in April and October. Although the nature of this phenomenon is not yet fully understood, the current trend is that the growth and development of any plant organism is controlled by the balance between the promotion of hormones (such as gibberellin and cytokinin) and the suppression of hormones (abscisic acid, etc.). Under normal circumstances, pears and apples generally remain dormant after forming flower buds and bloom until the spring of next year. As a result,