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Inheritance and Improvement of Grain Shape in indica Rice

SHI Chunhai,SHEN Zongtan (Department of Agronomy,Zhejiang Agricultural University.Hangzhou 310029)  
Grain shape of paddy rice,including length.width,thickness and ratio of length to width. were quantitative traits controlled by polygene.The most of the traits in crosses were mainly controlled by additive genetic effects and had higher genetic advance and the range of their heritabilities in broad and narrow-sense were 28.3%-94.0% and 4.0%-83.2%,respectively.There were closely relationships among grain length,grain width and ratio of length to width.Paddy grain length and ratio of length to width could be improved with heavier panicle and more panicles in higher selecting pressure.Using above methods of selection.Zhenong 928 and Zhenong 937 with preferable paddy grain shape and yield potential have been bred.
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