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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (1): 47-52.doi: 10.3724/SP.J.1006.2010.00047

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

Primary Mapping of QTL for Dehydration Rate of Maize Kernal after Physiologyical Maturing

LIU Xian-Jun1,WANG Zhen-Hua1,*,WANG Xia2,LI Ting-Feng1,ZHANG Lin1   

  1. 1Northeast Agricultural University，Harbin 15030，China；2Heilongjiang Bayi Agricultural University，Daqing 163319，China
  • Received:2009-06-04 Revised:2009-09-08 Online:2010-01-12 Published:2009-11-17
  • Contact: WANG Zhen-Hua, E-mail: zhenhuawang_2006@163.com

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Abstract:

The aim of this study was to identify QTL for dehydration rate of maize kernel after physiological maturing using 232 recombinant inbred lines derived from a cross between line Ji846 (more faster kernel dehydration rate, 1.18% d-1) and line Ye3189 (more slower kernel dehydration rate, 0.39% d-1). Dehydration rate of maize kernel of this population and two parents were evaluated according to the method of Wang et al.(2001) and Jin et al. (1997) at tested locations Shuangcheng and Harbin in 2007, respectively. A molecular genetic map including 10 linkage groups was constructed, covering 1 941.7 cM with mean distance 19.22 cM using 101 SSR markers. A total of nine QTLs were identified through software WinQTL2.5, which were located on chromosomes 2, 3, 4, 5 and 6, respectively. Additive effect of these QTLs was derived from line Ji846. Of them, two QTLs (qKdr-2-1 located in bnlg198-umc1516 of chromosomes 2, qKdr-6-1 located in phi126-phi077 of chromosomes 6) were repeatedly found in two environments, which explained 15.49% of total phenotypic variation. Since beneficial alleles were from line Ji846，it was concluded that these QTLs would have the greatest potential value for marker assisted selection for high kernel dehydration rate of maize after physiological maturing.

Key words: Maize, Recombination inbred line, Kernal dehydration rate, SSR, QTL

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