杂交水稻及亲本灌浆期籽粒和叶片内源激素的变化

Changes of Endogenous Hormone Levels in Leaves and Grains of Hybrid Rice and Its Parents during Filling Stage

以杂交水稻"Tiyou418"及亲本为材料,测定和分析了水稻灌浆期籽粒和叶片的内源激素水平。结果表明:"Tiyou418"在灌浆期籽粒中脱落酸(ABA)的变化趋势与亲本不同,前期高,后期低;吲哚乙酸(IAA)、玉米素核苷(ZR)和赤霉素(GA1+3)的变化趋势与亲本相同,但后期积累较高的GA1+3;"Tiyou418"叶片中4种内源激素变化趋势与亲本相似,含量除GA1+3外都介于亲本之间;"Tiyou418"ABA粒/叶峰值出现早,父母本的峰值出现晚,父本C418灌浆前期ZR的粒/叶高。这说明灌浆前期籽粒中较高的ABA有利于灌浆,灌浆后期叶片中(GA1+3+ZR+IAA)/ABA下降慢,有利于延缓衰老。

<Abstrcat> This study was undertaken to characterize the changes of endogenous hormone levels in hybrid rice Tiyou 418 and its parents Tjin/C418 during filling stage. The results showed that in grains the changes of abscisic acid(ABA) of Tiyou418 is different from that of its parents, higher in early stage and lower in later stage, the changes of IAA, ZR and GA_(1+3) of Tiyou418 are the same as those of its parents, but GA_(1+3) is high in later stage; In leaves, the changes of endogenous hormones of Tiyou418 are the same as those of its parents, except for GA_(1+3), the content of other endogenous hormones is between that of its parents; The peak grain/leaf of ABA in Tiyou 418 appeared early and that of its parents appeared later. The grain/leaf of ZR in C418 is high during early stage. These results indicated that the higher ABA in grains at early filling stage may be favorable to filling, the slow decrease of (GA_(1+3)+ZR+IAA)/ ABA in leaves at later filling stage may be favorable to delaying senescence.