Genome‐Wide Genetic Dissection of Supernumerary Spikelet and Related Traits in Common Wheat

Echeverry-Solarte, Morgan; Kumar, Ajay; Kianian, Shahryar F.; Mantovani, Éder Eduardo; Şimşek, Şenay; Alamri, Mohammed S.; Mohamed, Maryati

doi:10.3835/plantgenome2014.03.0013

Cited by 18 publications

(26 citation statements)

References 114 publications

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“…A population of 163 RILs was developed from a cross between the hexaploid hard white wheat (HWW) elite line WCB414 with the exotic hexaploid hard red wheat (HRSW) line WCB617. The line WCB414 has conventional (fusiform), awned, and glabrous wheat spikes; meanwhile, WCB617 is a plant introduction (pending to registration) characterized by the productions of SS, heterobraching behavior, awned spikes, and pubescencent glumes (Echeverry‐Solarte et al, 2014). Single seed descent was used to advance the population from F 2 to F 2:7 generation.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the RIL population was assessed at F 7:9 , F 10:11 , and F 12:13 generations in 2009, 2010, and 2011, respectively. More details about the mapping population have been described elsewhere (Echeverry‐Solarte et al, 2014). WCB414 is an elite line with fusiform architecture, awned, and glabrous glumes, while WCB617 is an exotic line with SS, awns, and pubescence on the glumes.…”

Section: Methodsmentioning

confidence: 99%

“…Spikes from SS lines have more than one spikelet per rachis node, and have been suggested as a means of increasing wheat yield by increasing the number of fertile florets from which the grain develops (Pennell and Halloran 1983, 1984a, 1984b; Hucl and Fowler 1992). Several studies suggest that the SS trait is controlled by at least three genes (Koric, 1973; Pennell and Halloran, 1983; Klindworth et al, 1990a; Echeverry‐Solarte et al, 2014) including a major gene located on chromosome 2D (Klindworth et al, 1990b; Dobrovolskaya et al, 2009; Echeverry‐Solarte et al, 2014). Apparently, the gene on chromosome 2D is a suppressor of SS gene expression in commercial wheat cultivars (Pennell and Halloran, 1983; Echeverry‐Solarte et al, 2014).…”

mentioning

confidence: 99%

“…Several studies suggest that the SS trait is controlled by at least three genes (Koric, 1973; Pennell and Halloran, 1983; Klindworth et al, 1990a; Echeverry‐Solarte et al, 2014) including a major gene located on chromosome 2D (Klindworth et al, 1990b; Dobrovolskaya et al, 2009; Echeverry‐Solarte et al, 2014). Apparently, the gene on chromosome 2D is a suppressor of SS gene expression in commercial wheat cultivars (Pennell and Halloran, 1983; Echeverry‐Solarte et al, 2014).…”

mentioning

confidence: 99%

“…Past studies investigating the association of agronomically important traits (AIT) in branched genotypes were based on phenotypic analyses. Some studies used molecular markers to identify genetic regions controlling the SS trait (Dobrovolskaya et al, 2009; Li et al, 2011; Haque et al, 2012; Echeverry‐Solarte et al, 2014), but none investigated the association of these loci with other AIT. In the present study, a recombinant inbred line (RIL) population derived from a cross between an elite white wheat line (WCB414) and a wheat line with SS and pubescence on glumes (WCB617) was used to (i) detect QTL for nine spike‐related traits and 10 important AIT of spring wheat; (ii) identify if the QTL/genes for SS‐related share common genomic region with QTL for spike‐related and AIT; and (iii) identify novel genes and/or alleles with potential use in breeding programs for wheat improvement.…”

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Genome‐Wide Mapping of Spike‐Related and Agronomic Traits in a Common Wheat Population Derived from a Supernumerary Spikelet Parent and an Elite Parent

Echeverry-Solarte¹,

Kumar²,

Kianian

et al. 2015

The Plant Genome

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In wheat, exotic genotypes harbor a broad range of spike-related traits, and can be used as a source of new genes for germplasm enhancement in wheat breeding programs. In the present study, a population of 163 recombinant inbred lines was derived from a cross between an elite line (WCB414) and an exotic line (WCB617) with branched spike (supernumerary spikelet; SS) head morphology. The population was evaluated over four to six environments to identify quantitative trait loci (QTL) associated with nine spike-related traits and 10 agronomic traits. A genetic map consisting of 939 diversity arrays technology (DArT) markers was constructed. Composite interval mapping identified a total of 143 QTL located on 17 different wheat chromosomes and included 33 consistent and definitive QTL. The amount of phenotype variation explained (PVE) by individual QTL ranged from 0.61 to 91.8%. One major QTL for glume pubescence was located in a QTL-rich region on the short arm of chromosome 1A, where loci for other traits such as for kernels per spike (KS) and spike length (SL) were also identified. Similarly, a cluster of QTL associated with yield-related, agronomic and spike-related traits contributing up to 40.3% of PVE was found on the short arm of chromosome 2D, in the vicinity of a major QTL for SS-related traits. Consistent and major QTL identified in the present study may be useful in markerassisted breeding programs to facilitate transfer of desirable alleles into other germplasm. Desirable QTL alleles were also contributed by the exotic line, suggesting the possibility of enriching the breeding germplasm with alleles from SS genotypes. The wheat (Triticum aestivum L.) spike (also termed ear) is the most readily identifiable characteristic of common wheat and is the source of the primary crop product, grain. Spike architecture is defined by spikerelated traits, which contribute to pronounced phenotypic differences among wheat subspecies. For instance, the spikes of spelt wheat (T. aestivum ssp. spelta) have a long and fragile rachis, lax density with spikelets well separated from each other on the rachis, and are not free threshing (Percival, 1921;Jantasuriyarat et al., 2004). The spikes of club wheat (T. aestivum ssp. compactum) however, have a tough rachis, short length, are laterally compressed with spikelets closely packed, and are

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Genome‐Wide Mapping of Spike‐Related and Agronomic Traits in a Common Wheat Population Derived from a Supernumerary Spikelet Parent and an Elite Parent

Echeverry-Solarte¹,

Kumar²,

Kianian

et al. 2015

The Plant Genome

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New QTL alleles for quality-related traits in spring wheat revealed by RIL population derived from supernumerary × non-supernumerary spikelet genotypes

et al. 2015

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A population developed from an exotic line with supernumerary spikelets was genetically dissected for eight quality traits, discovering new genes/alleles with potential use in wheat breeding programs. Identifying new QTLs and alleles in exotic germplasm is paramount for further improvement of quality traits in wheat. In the present study, an RIL population developed from a cross of an elite wheat line (WCB414) and an exotic genotype with supernumerary spikelets (SS) was used to identify QTLs and new alleles for eight quality traits. Composite interval mapping for 1,000 kernels weight (TKW), kernel volume weight (KVW), grain protein content (GPC), percent of flour extraction (FE) and four mixograph-related traits identified a total of 69 QTLs including 19 stable QTLs. These QTLs were located on 18 different chromosomes (except 4D, 5D, and 6D). Thirteen of these QTLs explained more than 15% of phenotypic variation (PV) and were considered as major QTLs. In this study, we identified 11 QTLs for TKW (R (2) = 7.2-17.1 %), 10 for KVW (R (2) = 6.7-22.5%), 11 for GPC (R (2) = 4.7-16.9%), 6 for FE (R (2) = 4.8-19%) and 31 for mixograph-related traits (R (2) = 3.2-41.2%). In this population, several previously identified QTLs for SS, nine spike-related and ten agronomic traits were co-located with the quality QTLs, suggesting pleiotropic effects or close linkage among loci. The traits GPC and mixogram-related traits were positively correlated with SS. Indeed, several loci for quality traits were co-located with QTL for SS. The exotic parent contributed positive alleles that increased PV of the traits at 56% of loci demonstrating the suitability of germplasm with SS to improve quality traits in wheat.

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Genetic architecture of male floral traits required for hybrid wheat breeding

et al. 2016

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This study revealed a complex genetic architecture of male floral traits in wheat, and Rht-D1 was identified as the only major QTL. Genome-wide prediction approaches but also phenotypic recurrent selection appear promising to increase outcrossing ability required for hybrid wheat seed production. Hybrid wheat breeding is a promising approach to increase grain yield and yield stability. However, the identification of lines with favorable male floral characteristics required for hybrid seed production currently poses a severe bottleneck for hybrid wheat breeding. This study therefore aimed to unravel the genetic architecture of floral traits and to assess the potential of genomic approaches to accelerate their improvement. To this end, we employed a panel of 209 diverse winter wheat lines assessed for male floral traits and genotyped with genome-wide markers as well as for Rht-B1 and Rht-D1. We found the highest proportion of explained genotypic variance for the Rht-D1 locus (11-24 %), for which the dwarfing allele Rht-D1b had a negative effect on anther extrusion, visual anther extrusion and pollen mass. The genome-wide scan detected only few QTL with small or medium effects, indicating a complex genetic architecture. Consequently, marker-assisted selection yielded only moderate prediction abilities (0.44-0.63), mainly relying on Rht-D1. Genomic selection based on weighted ridge-regression best linear unbiased prediction achieved higher prediction abilities of up to 0.70 for anther extrusion. In conclusion, recurrent phenotypic selection appears most cost-effective for the initial improvement of floral traits in wheat, while genome-wide prediction approaches may be worthwhile when complete marker profiles are already available in a hybrid wheat breeding program.

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Genome‐Wide Genetic Dissection of Supernumerary Spikelet and Related Traits in Common Wheat

Cited by 18 publications

References 114 publications

Genome‐Wide Mapping of Spike‐Related and Agronomic Traits in a Common Wheat Population Derived from a Supernumerary Spikelet Parent and an Elite Parent

Genome‐Wide Mapping of Spike‐Related and Agronomic Traits in a Common Wheat Population Derived from a Supernumerary Spikelet Parent and an Elite Parent

New QTL alleles for quality-related traits in spring wheat revealed by RIL population derived from supernumerary × non-supernumerary spikelet genotypes

Genetic architecture of male floral traits required for hybrid wheat breeding

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