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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (07): 1151-1158.doi: 10.3724/SP.J.1006.2011.01151

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

QTL Analysis of Root Traits of Soybean at Seedling Stage

ZHOU Rong,CHEN Hai-Feng,WANG Xian-Zhi,WU Bao-Duo,CHEN Shui-Lian,ZHANG Xiao-Juan,WU Xue-Jun,YANG Zhong-Lu,QIU De-Zhen,JIANG Mu-Lan,ZHOU Xin-An*   

  1. Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crops Biology of the Ministry of Agriculture, Wuhan 430062, China
  • Received:2010-12-28 Revised:2011-03-27 Online:2011-07-12 Published:2011-05-11
  • Contact: 周新安, E-mail: xazhou@public.wh.hb.cn, Tel: 027-86711563

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Abstract: Root system plays important roles in plant growth and development, including uptaking water and nutrient, resisting biotic and abiotic stresses, and finally influencing yield and quality. A number of QTLs for shoot traits have been detected using different populations in soybean [Glycine max (L.) Merr], but rarely for root trait. The aim of the present study was to identify QTLs for some root traits at seedling stage in soybean. A total of 165 recombinant inbred lines (RILs) derived from the cross between Zhongdou 29 and Zhongdou 32 were used. Soybean seedlings were hydroponically cultured,root traits including main root length, number of lateral roots, root weight, root volume, and aerial part traits such as plant weight, shoot weight per plant, and ratio of root weight to shoot weight were measured at the stage of V2 (first trifoliolate leaf fully expanded). By composite interval mapping (CIM) method, twenty QTLs for roots and aerial part traits were mapped on eight chromosomes, including nine major-effect QTLs on chromosome 11 and 14 with 10.5–26.1% of the phenotypic variation. On chromosome 11 and 14, some QTLs for root traits and aerial part traits were clustered, which was consistent with the correlation analysis of phenotypic traits, indicating that the root traits are associated with the shoot traits.

Key words: Soybean, Root traits, Seedling stage, QTL mapping

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