Genetic analysis of leaf morphology underlying the plant density response by QTL mapping in maize (Zea mays L.) |
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Authors: | Lixia Ku Zhenzhen Ren Xiao Chen Yong Shi Jianshuang Qi Huihui Su Zhiyong Wang Guohui Li Xiaobo Wang Yuguang Zhu Jinlong Zhou Xin Zhang Yanhui Chen |
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Affiliation: | 1.College of Agronomy, Synergetic Innovation Center of Henan Grain Crops and National Key Laboratory of Wheat and Maize Crop Science,Henan Agricultural University,Zhengzhou,China;2.Henan Province Seed Control Station,Zhengzhou,China;3.Research Institute of Food Crops,Henan Academy of Agricultural Science,Zhengzhou,China |
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Abstract: | Maize yield increase has been strongly linked to plant population densities over time with changes in plant architecture, but the genetic basis for the plant architecture response to plant density is unknown, as is its stability across environments. To elucidate the genetic basis of the plant architecture response to density in maize, we mapped quantitative trait loci (QTLs) for leaf morphology-related traits in four sets of recombinant inbred line (RIL) populations under two plant density conditions. Forty-five QTLs for six traits were detected in both high and low plant density conditions. Thirty-seven QTLs were only detected when grown under high plant density, and 34 QTLs were only detected when grown under low plant density. Twenty-two meta-QTLs (mQTLs) were identified by meta-analysis, and mQTL1-1, mQTL3-2 and mQTL8 were identified when grown under high and low plant densities, with R 2 of some initial QTLs > 10 %, suggesting the mQTLs might be hot spots of the important QTLs for the related traits under planting density stress conditions. The results presented here provide useful information for further research and the marker-assisted selection of varieties targeting increased plant density and will help to reveal the molecular mechanisms related to leaf morphology in response to density. |
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