Abstract: Pot experiments with middle-season rice variety Peiliangyou 93 served as material were conducted to study the effects of synergist added to special formulated fertilizers on endogenous phytohormones ABA,IAA,GA₃ and ZR in rice plant under soil drought conditions.After drought treatment,ABA accumulated massively first and then decreased.ABA in roots and leaves rose sharply,58 to 101 times as high as that in the control in roots.ABA accumulation in root was much faster than that in leaf.Synergist treatment enhanced the accumulation of ABA.Before drought stress,the contents of IAA,ZR and GA₃ in roots under synergist treatment were higher than those of the control,while under drought stress,the contents of IAA,ZR and GA₃ in roots decreased,and the decreasing rates of synergist treatment were larger than those of the control.However,the changes of IAA,ZR and GA₃ contents in leaf were contrary.

Key words: rice, drought stress, formulated fertilizer synergist, endogenous phytohormones

摘要： 为揭示土壤自然干旱条件下配方肥增效剂对水稻植株内源激素的影响，以中稻培两优93为材料，采用盆栽法研究了配方肥增效剂对水稻内源脱落酸（ABA）、生长素（IAA）、赤霉酸（GA3）、玉米素核苷（ZR）的影响。干旱处理后，ABA在前期大量积累，后期呈下降趋势。根系和叶片中ABA含量大幅度升高，其中根系中ABA增幅达58~101倍，根源ABA积累幅度远高于叶源ABA积累幅度，而增效剂处理促进了ABA的积累。干旱胁迫前，增效剂处理水稻植株根系IAA、ZR和叶片GA3均显著高于对照；而干旱胁迫后，增效剂处理植株上述激素水平均大幅下降，而对照下降幅度较小。叶中IAA、ZR和GA3的变化则与根系相反。

关键词: 水稻, 干旱胁迫, 配方肥增效剂, 内源植物激素