Most of boll abscission occurred in the first node and most of square abscission in the second node at the same branch.
同一果枝第一果节以落铃为主，第二果节以落蕾为主。
The paper studied effects of GA_3 and IAA on cellulase activity in abscission zone from petiole of primary leaves of bean, cotyledon petioles and boll petioles of cotton.
赤霉酸（GA_3）处理菜豆叶柄和棉苗子叶柄外植体，离区的纤维素酶活力增加，而吲哚乙酸（IAA）则抑制离区纤维索酶的活力。
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