The Effect of Different Water Deficit during Panicle Developmental Stage of Hybrid Rice on Grain Formation

doi:10.7668/hbnxb.2011.05.037

Abstract

Abstract: During panicle development stage of hybrid rice varieties,with experiment cultivated in pots and contrived simulation of water deficit,method to determine soil moisture by electronic balance and W.E.T Sensor,the effect of water treatments lasting different time and stress level on grain formation was studied.The results showed that both different time intervals and levels water deficit influenced panicle growth and development obviously,numbers of spikelets and filled grains,fertility rate and 1 000-grain weight all decreased,which leaded to the sharp reduction of panicle weight and grain yields.The decrease of spikelets numbers is one of the main reasons leading to yield reduction,secondary,the drop of fertility rate and grain weight.A positive correlation existed between yield drop range and water deficit degree,heavier water deficit had the greater influence than middle water deficit,and lower water deficit had certain influence,too.Water deficit during entire period of panicle growth and 10-20 d after panicle initiation had the greatest influence,nextly,0-10 d after panicle initiation,20-30 d after panicle initiation had little influence on the panicle growth,but certain influence on grain filling.Influence degree of super hybrid rice,Guodao 6,was lower than that of normal hybrid rice,Shanyou 63,and its automatic adjustment ability of growth compensation and yield component factors after enduring moderate water deficit was stronger.

Key words: Hybrid rice, Water deficit, Panicle development, Yield traits

CLC Number:

S511

ZHANG Wei-xing, ZHU De-feng, ZHU Zhi-wei, LIN Xian-qing, ZHANG Yu-ping, CHEN Hui-zhe. The Effect of Different Water Deficit during Panicle Developmental Stage of Hybrid Rice on Grain Formation[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2011, 26(5): 186-191. doi: 10.7668/hbnxb.2011.05.037.

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