Quantitative Trait Loci Mapping for Chlorophyll Fluorescence and Associated Traits in Wheat (Triticum aestivum)

文献类型： 外文期刊

第一作者： Yang, De-Long

作者： Yang, De-Long;Jing, Rui-Lian;Chang, Xiao-Ping;Li, We

作者机构：

关键词： additive effect;chlorophyll content;chlorophyll fluorescence;epistasis;mapping;quantitative trait loci;Triticum aestivum

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

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年卷期：

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收录情况： SCI

摘要： Parameters of chlorophyll fluorescence kinetics (PCFKs) under drought stress condition are generally used tocharacterize instincts for dehydration tolerance in wheat (Triticum aestivum L.). Therefore, it is important to mapquantitative trait loci (QTLs) for PCFKs In wheat genetic improvement for drought tolerance. A doubled haploid (DH)population with 150 lines, derived from a cross between two common wheat varieties, Hanxuan 10 and Lumai 14,was used to analyze the correlation between PCFKs and chlorophyll content (ChIC) and to map QTLs at the grain-filling stage under conditions of both rainfed (drought stress, DS) and well-watered (WW), respectively. QTLs forthese traits were detected by QTLMapper version 1.0 based on the composite Interval mapping method of themixed-linear model. The results showed a very significant positive correlation between Fv, Fm, Fv/Fm and Fv/Fo.The correlation coefficients were generally higher under WW than under DS. Also, there was a significant or a highfysignificant positive correlation between Fv, Fm, Fv/Fm, Fv/Fo and ChIC. The correlation coefficients were higher inthe DS group than the WW group. A total of 14 additive QTLs (nine QTLs detected under DS and five QTLs under WW)and 25 pairs of epistatic QTLs (15 pairs detected under DS and 10 pairs under WW) for PCFKs were mapped onchromosomes 6A, 7A, 1B, 3B, 4D and 7D. The contributions of additive QTLs for PCFKs to phenotype variation werefrom 8.40% to 72.72%. Four additive QTLs (two QTLs detected under DS and WW apiece) controlling ChIC weremapped on chromosomes 1A, 5A and 7A. The contributions of these QTLs for ChIC to phenotype variation werefrom 7.27% to 11.68%. Several QTL clusters were detected on chromosomes 1B, 7A and 7D, but no shared chromo-somal regions for them were identified under different water regimes, indicating that these QTLs performeddifferent expression patterns under rainfed and well-watered conditions.

分类号： Q94

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