Association mapping in durum wheat grown across a broad range of water regimes
Open Access
- 1 November 2010
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 62 (2), 409-438
- https://doi.org/10.1093/jxb/erq287
Abstract
Association mapping was used to dissect the genetic basis of drought-adaptive traits and grain yield (GY) in a collection of 189 elite durum wheat accessions evaluated in 15 environments highly different for water availability during the crop cycle (from 146 to 711 mm) and GY (from 9.9 to 67.3 q ha−1). For highly heritable traits (e.g. heading date, kernel weight, etc.) several significant experiment-wise marker-trait associations were detected across five or more (up to 13 for kernel weight) environments, with R2 values ranging from ca. 5 to 10%. As to GY, significant associations (R2 from 2.5 to 4.2%) were mostly detected in one environment only (56 markers), while decreasing rapidly from two to five environments (from 20 to three markers, respectively) and with only one marker (Xbarc197 on chr. 5A) found significant in six environments (ranging from low- to high-yielding). These results are probably due to the complex genetic basis of GY and its interaction with environmental conditions. The number of markers significantly affecting GY decreased considerably under drought conditions, suggesting a limited effectiveness of association mapping to identify loci for GY under low-moisture conditions, most likely because different genotypes can attain similar phenotypes via different morpho-physiological traits and corresponding gene networks. Our study confirmed the role of major loci for phenology previously described in biparental mapping populations, highlighted a novel set of loci for drought-adaptive traits, and provided information on the agronomic value of the alleles at such loci across a broad range of soil moisture conditions.Keywords
This publication has 79 references indexed in Scilit:
- Association genetics in crop improvementCurrent Opinion in Plant Biology, 2010
- Analysis of diversity and linkage disequilibrium along chromosome 3B of bread wheat (Triticum aestivum L.)Theoretical and Applied Genetics, 2009
- What Has Natural Variation Taught Us about Plant Development, Physiology, and Adaptation?Plant Cell, 2009
- Quantitative Trait Loci and Crop Performance under Abiotic Stress: Where Do We Stand?: Table I.Plant Physiology, 2008
- Association mapping of partitioning loci in barleyBMC Genomic Data, 2008
- Whole genome linkage disequilibrium maps in cattleBMC Genomic Data, 2007
- A Mixed-Model Approach to Association Mapping Using Pedigree Information With an Illustration of Resistance to Phytophthora infestans in PotatoGenetics, 2007
- Recent history of artificial outcrossing facilitates whole-genome association mapping in elite inbred crop varietiesProceedings of the National Academy of Sciences of the United States of America, 2006
- A unified mixed-model method for association mapping that accounts for multiple levels of relatednessNature Genetics, 2005
- The Pattern of Polymorphism in Arabidopsis thalianaPLoS Biology, 2005