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《Scientia Agricultura Sinica》 2008-02
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Effects of Spikelet and Grain Position on Fertile Spikelet Number, Grain Weight and Quality of Wheat

PEI Xue-xia1,2, WANG Jiao-ai1, DANG Jian-you1, WANG Xiu-bin2, ZHANG Ding-yi1 (1Wheat Research Institute, Shanxi Academy of Agricultural Sciences, Linfen 041000, Shanxi; 2 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Sciences, Beijing 100081)  
【Objective】The experiment was conducted to study the change of fertile spikelet number,kernel weight and quality of wheat with spikelet and grain position. 【Method】Using field experiment, effect of spikelet and grain position on fertile spikelet number, kernel weight and quality of three wheat cultivars, Linyou 2018, Linyou 145 and Linyou 2069, which have equal fertile spikelet and unequal kernel weight and quality, were studied.【Result】Results showed that, fertile spikelet number, spikelet weight, kernel weight, protein content, dry gluten, sedimentation value, dough rheology characteristics in different spikelet positions showed parabolic changes. Kernel weight and quality of the 1st, 2nd, 3rd grain position in different spikelet positions also showed parabolic changes. And this is accord with medial dominant in grain development. Kernel weight of the 1st grain position is close to that of the 2nd grain position, and both higher than that of the 3rd grain position. Grain of 2nd position had bigger potential in improving yield. Coefficient of variation of protein content, dry gluten and sedimentation value of the 2nd grain position in Linyou 2018 and Linyou 2069 was higher than other grain positions, and that of the 1st grain position in Linyou 145 was higher. In conclusion, the 2nd grain position of Linyou 2018 and Linyou 2069 and the 1st grain position of Linyou 145 had bigger potential in improving quality. 【Conclusion】 In wheat breeding and cultivation, as for wheat cultivars, which have no more than three grains in each spikelet, wheat stability quality and uniformity can be obtained simultaneously through little florets.
【Fund】: 国家科技支撑计划(2006BAD01A02-08);; 山西省科技厅攻关项目(031008)
【CateGory Index】: S512.1
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