在维持或消除植物的顶端优势方面，下面哪两种激素起关键性作用？（

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25864' and id < 2171296 and id<>'2171296' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25864' and id > 2171296 and id<>'2171296' order by id asc limit 5