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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (07): 1108-1113.doi: 10.3724/SP.J.1006.2010.01108

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

QTL Analysis for Mesocotyl Length in Rice(Qryza sativa L.)

HUANG Cheng,JIANG Shu-Kun**,FENG Ling-Ling,XU Zheng-Jin*,CHEN Wen-Fu   

  1. Key Laboratory of Crop Physiology, Ecology, Genetics and Breeding, Ministry of Agriculture / Key Laboratory of Northern Japonica Rice Breeding of Liaoning Province / Shenyang Agricultural University, Shenyang 110161, China
  • Received:2010-02-03 Revised:2010-04-20 Online:2010-07-12 Published:2010-06-12

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Abstract:

To understand genetic basis underlying the relationship between mesocotyl elongation and hormone (GA) in rice (Oryza sativa L.), we genetically analyzed RILs population derived from a cross between two japonica rice cultivars, Shennong 265 (long mesocotyl) and Lijiangxintuanheigu (short mesocotyl), with its linkage map. QTLs for mesocotyl length were detected under water and GA germination conditions. The results showed that GA at 1.50 mmol L-1 stimulated mesocotyl elongation dramatically. Total five QTLs for rice mesocotyl length, each accounting for 7% to 33% of the phenotypic variance (VE), were detected on chromosomes 1, 2, 3, 6, and 11 under two germination conditions (environments). The LOD value of each QTL was ranged from 3.65 to 15.52. Among the five QTLs, qML3, qML6, and qML11 were detected under both germination conditions and qml1 and qml2 were identified only under water germination condition. In comparison with other studies revealed that major QTL qML3 was easily re-detected in different populations and environments.

Key words: Rice, Mesocotyl length, Gibberellin, Quantitative trait loci

  
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