Background: The lateral root is one of the most important organs that constitute the root architecture system in plants. It can directly affect the contact area between plants and soil and plays an important role in plant structural support and nutrient absorption. Optimizing root architecture systems can greatly increase crop yields. This study was designed to identify the molecular markers and candidate genes associated with lateral root development in cotton and to evaluate correlations with yield and disease traits. Result: The number of lateral roots for 14-day old seedlings was recorded for 215 Gossypium arboreum accessions. A correlation analysis showed that the number of lateral roots positively correlates with the sympodial branch node and seed index traits, but negatively correlates with lint percentage. A Genome-wide association study (GWAS) identified 18 significant SNPs with 19 candidate genes associated with the lateral root number. Expression analysis identified three genes (FLA12, WRKY29, and RBOHA) associated with lateral root development. Conclusion: GWAS analysis identified key SNPs and candidate genes for lateral root number, and genes of FLA12, WRKY29, and RBOHA may play a pivotal role in lateral root development in Asian cotton.

HU Daowu;HE Shoupu;SUN Gaofei;JIA Yinhua;GENG Xiaoli;WANG Liru;PAN Zhaoe;CHEN Baojun;LI Hongge;ZUBAIR Iqbal;WANG Xiaoyang;ZHAO Zibo;GE Yuting;PANG Baoyin;DU Xiongming

Institute of Cotton Research of Chinese Academy of Agricultural Science/State Key Laboratory of Cotton Biology,Anyang 455000,Henan,China;Anyang Institute of Technology,Anyang 455000,China;School of Agricul-ture Sciences,Zhengzhou University,Zhengzhou 450000,Henan,China

棉花研究（英文）

[1]HU Daowu;HE Shoupu;SUN Gaofei;JIA Yinhua;GENG Xiaoli;WANG Liru;PAN Zhaoe;CHEN Baojun;LI Hongge;ZUBAIR Iqbal;WANG Xiaoyang;ZHAO Zibo;GE Yuting;PANG Baoyin;DU Xiongming-.A genome?wide association study of lateral root number for Asian cotton (Gossypium arboreum L.))[J].棉花研究（英文）,2022(02):93-102

arboreum,sympodial,lint,FLA12,WRKY29,RBOHA

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