Abstract
The utilization of dwarfing genes Rht-B1b and Rht-D1b in wheat significantly increased grain yield and contributed to the “green revolution”. However, the benefit of Rht-B1b and Rht-D1b in drought environments has been debated. Although quantitative trait loci (QTL) for kernel number per spike (KN) and thousand-grain weight (TGW) have been found to be associated with Rht-B1 and Rht-D1, the confounding effect of environmental variation has made a direct association difficult to find. In this study, we used a doubled haploid population (225 lines) of Westonia × Kauz, in which both Rht-B1b (Kauz) and Rht-D1b (Westonia) segregated. The purpose of the study was to determine the interaction of Rht-B1 and Rht-D1 with grain yield components, namely KN and TGW, and to investigate genotype-by-environment interactions in glasshouse and field trials conducted in 2010 and 2011 in Western Australia. A genetic map of 1,156 loci was constructed using 195 microsatellite markers, two gene-based markers for Rht-B1 and Rht-D1, and 959 single nucleotide polymorphisms. The major QTL for TGW and KN were strongly linked to Rht-B1 and Rht-D1 loci and the positive effects were associated with the wild-type alleles, Rht-B1a and Rht-D1a. The major QTL of TGW were on chromosome 2D and 4B. The significant genetic effects (14.6–22.9 %) of TGW indicated that marker-assisted selection for TGW is possible, and markers gwm192a (206 bp) or gwm192b (236 bp) can be used as indicators of high TGW. For KN, one major QTL was detected on chromosome 4D in the analysis across three environments. The association of the wild-type alleles Rht-B1a and Rht-D1a in drought environments is discussed.
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Abbreviations
- DH:
-
Doubled haploid
- GA:
-
Gibberellic acid
- GAI:
-
Gibberellic acid insensitive
- GW:
-
Grain weight per spike
- KN:
-
Kernel number per spike
- QTL:
-
Quantitative trait loci
- SNP:
-
Single nucleotide polymorphism
- SSR:
-
Microsatellite molecular markers
- TGW:
-
Thousand-grain weight
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Acknowledgments
This work was supported by Murdoch University and Grain Research & Development Corporation ‘grant number UMU00039’. The authors acknowledge Ruilian Jing, Wei Shi, Xianshan Hu (Chinese Academy of Agricultural Science, China) and Jun Zhu (Zhe Jiang University) for their help in QTL analysis and checking the mapping data. The authors are very grateful to Irene Waters and Tim Setter (Department of Agriculture and Food, Western Australia) for providing the Westonia and Kauz double haploid lines and to Mehmet Cakir for providing 199 polymorphic SSR marker names.
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Zhang, J., Dell, B., Biddulph, B. et al. Wild-type alleles of Rht-B1 and Rht-D1 as independent determinants of thousand-grain weight and kernel number per spike in wheat. Mol Breeding 32, 771–783 (2013). https://doi.org/10.1007/s11032-013-9905-1
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DOI: https://doi.org/10.1007/s11032-013-9905-1