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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (2): 267-275.doi: 10.3724/SP.J.1006.2010.00267

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

Analysis of QTLs Associated with Photosynthesis Characteristics in Wheat Seedlings

LIANG Yan1,ZHANG Kun-Pu2,ZHAO Liang1,LIANG Xue1,ZHANG Wen-Ting1,SUN Xiao-Lin1,MENG Qing-Wei1,TIAN Ji-Chun1,*,ZHAO Shi-Jie1,*
  

  1. 1 State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an 271018, China; 2Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2009-05-26 Revised:2009-10-02 Online:2010-02-10 Published:2010-01-10
  • Contact: ZHAO Shi-Jie, E-mail: sjzhao@sdau.edu.cn; Tel: 0538-8249767;WANG Ji-Chun, E-mail: jctian@sdau.edu.cn; Tel: 0538-8242040

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Abstract:

For the purpose of detecting QTLs associated with photosynthetic related traits, a set of 168 doubled haploid (DH) lines derived from the cross between Huapei 3 and Yumai 57 was tested with 324 SSR markers covering the whole genome of wheat (Triticum aestivum L.). The net photosynthetic rate, gas changes, chlorophyll content, and chlorophyll fluorescence in leaves were investigated in both DH population and the parents at seedling stage. QTL analysis was carried out using QTLNetwork version 2.0 based on the mixed linear model. A total of 17 additive QTLs and 20 pairs of epistatic QTLs were detected for the photosynthetic related traits. All additive QTLs and 16 pairs of epistatic QTLs had interactions with environments. In agreement with the high correlations of phenotypes, several traits shared common QTL regions, and showed tight linkages of these QTLs or pleiotropisms. In the interval between Xwmc215 and Xgdw63 on chromosome 5D, three major additive QTLs for chlorophyll a, chlorophyll b, and carotinoid contents explained the phenotypic variations by 18.23%, 10.40%, and 27.25%, respectively, whose positive alleles were all originated from Huapei 3. These QTLs are favorable for marker-assisted selection. In addition, this region was near the QTLs for net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), and the ratio of Cito gas conductance (Cr). The QTL for Ci on chromosome 5B was a minor locus but explained relatively great phenotypic variation in the interactions between QTLs and environments.

Key words: Photosynthetic rate, Chlorophyll content, Chlorophyll fluorescence parameters, QTL mapping, Wheat

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