J Integr Plant Biol. ›› 2009, Vol. 51 ›› Issue (9): 818-824.DOI: 10.1111/j.1744-7909.2009.00854.x

Special Issue: Rice Genomics and Agriculture

• Cell and Developmental Biology •     Next Articles

Quantitative Trait Loci for Panicle Layer Uniformity Identified in Doubled Haploid Lines of Rice in Two Environments

Liangyong Ma1,2, Jinsong Bao2, Longbiao Guo1, Dali Zeng1, Ximing Li1, Zhijuan Ji1, Yingwu Xia2, Changdeng Yang1* and Qian Qian1*   

  1. 1 State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
    2 Key Laboratory of Zhejiang Province and Chinese Ministry of Agriculture for Nuclear-Agricultural Sciences, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hua Jiachi Campus, Hangzhou 310029, China

Abstract:

Uniformity of stem height in rice directly affects crop yield potential and appearance, and has become a vital index for rice improvement. In the present study, a doubled haploid (DH) population, derived from a cross between japonica rice Chunjiang 06 and indica rice TN1 was used to analyze the quantitative trait locus (QTL) for three related traits of paniclelayer- uniformity; that is, the tallest panicle height, the lowest panicle height and panicle layer disuniformity in two locations: Hangzhou (HZ) and Hainan (HN). A total of 16 QTLs for three traits distributed on eight chromosomes were detected in two different environments. Two QTLs, qTPH-4 and qTPH-8 were co located with the QTLs for qLPH-4 and qLPH-8, which were only significant in the HZ environment, whereas the qTPH-6 and qLPH-6 located at the same interval were only significant in the HN environment. Two QTLs, qPLD-10-1 and qPLD-10-2, were closely linked to qTPH-10, and they might have been at the same locus. One QTL, qPLD-3, was detected in both environments, explaining more than 23% of the phenotypic variations. The CJ06 allele of qPLD-3 could increase the panicle layer disuniformity by 9.23 and 4.74 cm in the HZ and HN environments. Except for qPLD-3, almost all other QTLs for the same trait were detected only in one environment, indicating that these three traits were dramatically affected by environmental factors. The results may be useful for elucidation of the molecular mechanism of panicle-layer-uniformity and marker assisted breeding for super-rice.
 

Ma L, Bao J, Guo L, Zeng D, Li X, Ji Z, Xia Y, Yang C, Qian Q (2009). Quantitative trait loci for panicle layer uniformity identified in doubled haploid lines of rice in two environments. J. Integr. Plant Biol. doi: 10.1111/j.1744-7909.2009.00854.x.

Key words: double haploid population, panicle layer uniformity, plant height, quantitative trait loci, rice.

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