ABA与GA对水稻籽粒灌浆的调控

灌浆初期籽粒中ABA(脱落酸)含量(ng g-1FW)和ABA与GA(赤霉素)的比值，强势粒高于弱势粒，籽粒充实度好的组合高于籽粒充实度差的组合。开花后2天，喷施外源ABA，籽粒中ABA含量和ABA/GA增大，喷施外源GA后籽粒中GA含量增加，ABA/GA减小。低浓度(15mg/L)ABA处理后，灌浆初期籽粒中ADPG焦磷酸酶和淀粉合成酶活性及淀粉含量增加，

Regulation of ABA and GA to the Grain Filling of Rice

ABA(Abscisic acid) content(ng g-1FW) and the ratio of ABA to GA(Gibberellin) in strong potential grains or in the grains of the combination with good plumpness were higher than those in weak potential grains or in the grains of the combination with poor plumpness at early filling stage. Spraying exogenous ABA on the second day from anthesis increased ABA content and the ratio of ABA to GA, and spraying GA increased GA content and reduced the ratio in the grains. Low concentration(15mg/L) ABA treatment raised ADP-glucose pyrophos-phorylase and starch synthase activities and starch content, and reduced soluble sugar content in grains at early filling stage, and increased grain filling rate, and shortened the time reaching the maximum filling rate, and promoted matter mobilization from stems and sheaths and raised seed-setting percentage, filled grain percentage and grain yield. The results were reversed for the treatments of high concentration(30mg/L) ABA as well as both low and high concentration GA (20 and 40mg/L respectively). It was suggested that properly raising ABA content and the ratio of ABA to GA in the early developing grains played a role in promoting the grain filling of rice.