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doi:10.1534/genetics.106.068361
A more recent version of this article appeared on May 1, 2007.
REGULAR RESEARCH PAPERS |
Identification of Quantitative Trait Loci and Environmental Interactions for Accumulation and Remobilization of Water-soluble Carbohydrates in Wheat (Triticum aestivum L.) Stems
De-Long Yang 1, Rui-Lian Jing 1*, Xiao-Ping Chang 1 and Wei Li 2
1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences
2 Gansu Agricultural University
* To whom correspondence should be addressed. E-mail: jingrl{at}caas.net.cn.
Submitted on November 18, 2006
Revised on January 10, 2007
Accepted on 25 January 2007
Genetic analyses of nine traits associated with stem water-soluble carbohydrates (SWSC) accumulation and remobilization at grain filling period under drought stress (DS) and well-watered (WW) conditions were undertaken using doubled haploid lines (DHLs) derived from two Chinese common wheat cultivars. Some significantly and very significantly positive correlation was observed among nine traits associated with SWSC. Higher phenotypic values for most traits were detected under DS. Broad sense heritabilities (hB2) of the traits showed wide fluctuations between two water treatments. A total of 48 additive and 62 pairs of epistatic QTLs for nine traits were identified to distribute on all 21 chromosomes. A majority of QTLs involved significant additive and epistatic effects, with interactions of QTLs and environments (QEIs). Two additive and two pairs of epistatic loci involved only QEIs without corresponding significant additive or epistatic effects. The contributions of the additive QEIs were two to four folds higher than those of their corresponding additive QTLs. Most of the additive QEIs for traits associated with SWSC interacted with DS. In addition, some QTLs for the grain-filling efficiencies and thousand-grain weight were co-located in the same or adjacent chromosome intervals with QTLs for accumulation and remobilization efficiency of SWSC and SWSC at the earlier flowering stage.
Key Words: Drought tolerance, QTL environment interaction, Quantitative trait loci, Triticum aestivum L., Water-soluble carbohydrates