Journal article : China Rice 2017 Vol.23 No.4 pp.135-138 ref.8
Abstract : In order to clarify the sensitive period of water during the growth of rice, explore the cultivation measures to resist drought, the effects of drought stress on yield and growth characteristics of rice in different periods were studied, using two conventional japonica cultivars Chugeng 29 and Yungeng 39 as materials, to precisely control soil moisture (water potential) by pot experiment. The results indicated that the yield of Chugeng 29 and Yungeng 39 at different drought stress treatments decreased by 10.63%-47.60% and 6.19%-47.27% respectively, compare with the control. Yield decreased degree ranked as follows: drought stress in early stage of panicle initiation (T2) > drought stress in effective tillering stage (T1) > drought stress in late stage of panicle initiation (T3) > drought stress in booting stage (T4). Compared with the control, effective panicles per pot of two cultivars were reduced by drought stress in effective tillering stage, the number of spikelet per panicle was obviously reduced by drought stress in early stage of panicle initiation, the number of filled grain per panicle and seed setting rate were obviously reduced by drought stress in late stage of panicle initiation, the seed setting rate or 1 000-grain weight was influenced by drought stress in booting stage.
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