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lodging resistance and yield potential of winter wheat:effect of planting density and genotype

Frontiers of Agricultural Science and Engineering 2015年第2期2卷 168-178页

作者： Yonggui XIAO Jianjun LIU Haosheng LI Xinyou CAO Xianchun XIA Zhonghu HE Institute of Crop Science National Wheat Improvement CenterChinese Academy of Agricultural Sciences(CAAS)Beijing 100081China Crop Research Institute Shandong Academy of Agricultural SciencesJinan 250100China International Maize and Wheat Improvement Center(CIMMYT)China Office c/o CAASBeijing 100081China

Improved lodging resistance is important for achieving high yield in irrigated *** study was conducted to determine genotypic variation in lodging resistance and related morphological traits among winter wheat cultivars planted at two densities,and to identify key traits associated with lodging *** performance of 28 genotypes,including 24 released cultivars and four advanced lines,was evaluated at 250 plants per square meter and 500 plants per square meter in Shandong province during the 2008–2009 and 2009–2010 crop *** the higher density,the average grain yield was 2.6%higher,even though lodging score rose by as much as 136%.The higher planting density increased lodging through increased leaf area index(LAI),plant height,center of gravity and length of basal internodes,and reduced grain weight per spike and diameter of the lower two stem ***,center of gravity and diameter of first internodes,as the important indicators for lodging resistance,were significantly correlated with lodging score,with R=0.62,0.59 and–0.52(Plodging resistance in irrigated *** carrying high plant density tolerance and high yield potential,such as Jimai 22 and Liangxing 66,were recommended as leading cultivars for production as well as elite crossing parents for further increasing yield potential in the Yellow and Huai Valleys Winter Wheat Zone in China.

关键词： common wheat yield potential lodging performance pushing resistance leaf area index

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