African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6169

Full Length Research Paper

QTL mapping for ear length and ear diameter under different nitrogen regimes in maize

Hongmei Zhang1,4*, Zuping Zheng2, Xiaohong Liu3, Zhong Li2, Chuan He2, Daihui Liu2, Yangchun Luo2, Guoqin Zhang2, Zhenbo Tan3 and Runzhi Li1
1Shanxi Agricultural University, Taigu 030800, P. R. China. 2Nanchong Institute of Agricultural Sciences, Nanchong 637000, P. R. China. 3College of Life Sciences, China West Normal University, Nanchong 637009, P. R. China. 4Maize Research Institute, Shanxi Academy of Agricultural Sciences, Xinzhou 034000, P. R. China.
Email: [email protected]

  •  Accepted: 15 February 2010
  •  Published: 18 April 2010

Abstract

Ear length (EL) and ear diameter (ED) are two of the most important traits in maize (Zea mays L.), related to yield and plant morphology. In this study, an F9recombinant inbred line (RIL) population was used to identify the quantitative trait loci (QTLs) controlling EL and ED under two nitrogen (N) regimes. As a result, 3 QTLs were detected under N rich environment, 1 for EL on chromosome 1 and 2 for ED on chromosome 9. Under N stress environment, 4 QTLs were identified, 1 for EL on chromosome 1 and 3 for ED on chromosome 4 and 9. The phenotypic variances explained by these QTLs ranged from 5.68% to 9.86%, their additive effects were from -0.74 to 0.16. These results were beneficial for realizing the genetic basis of EL and ED and carrying out marker-assisted selection in maize.

 

Key words: Maize (Zea mays L.), ear length, ear diameter, quantitative trait locus, recombinant inbred line, nitrogen.

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