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Quantitative trait locus analysis for spikelet shape-related traits in wild wheat progenitor Aegilops tauschii: Implications for intraspecific diversification and subspecies differentiation.
PLoS One. 2017; 12(3):e0173210.Plos

Abstract

Wild diploid wheat Aegilops tauschii, the D-genome progenitor of common wheat, carries large genetic variation in spikelet and grain morphology. Two differentiated subspecies of Ae. tauschii, subspecies tauschii and strangulata, have been traditionally defined based on differences in spikelet morphology. Here, we first assessed six spikelet shape-related traits among 199 Ae. tauschii accessions, and found that the accessions belonging to TauL1major lineage produced significantly longer spikes, higher spikelet density, and shorter, narrower spikelets than another major lineage, TauL2, in which the strangulata accessions are included. Next, we performed quantitative trait locus (QTL) analysis of the spikelet and grain shape using three mapping populations derived from interlineage crosses between TauL1 and TauL2 to identify the genetic loci for the morphological variations of the spikelet and grain shape in Ae. tauschii. Three major QTL regions for the examined traits were detected on chromosomes 3D, 4D and 7D. The 3D and 4D QTL regions for several spikelet shape-related traits were conserved in the three mapping populations, which indicated that the 3D and 4D QTLs contribute to divergence of the two major lineages. The 7D QTLs were found only in a mapping population from a cross of the two subspecies, suggesting that these 7D QTLs may be closely related to subspecies differentiation in Ae. tauschii. Thus, QTL analysis for spikelet and grain morphology may provide useful information to elucidate the evolutionary processes of intraspecific differentiation.

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Authors+Show Affiliations

Nishijima R
Laboratory of Plant Genetics, Graduate School of Agricultural Science, Kobe University, Nada, Kobe, Japan.
Okamoto Y
Laboratory of Plant Genetics, Graduate School of Agricultural Science, Kobe University, Nada, Kobe, Japan.
Hatano H
Laboratory of Plant Genetics, Graduate School of Agricultural Science, Kobe University, Nada, Kobe, Japan.
Takumi S
Laboratory of Plant Genetics, Graduate School of Agricultural Science, Kobe University, Nada, Kobe, Japan.

MeSH

Chromosome MappingGenetic Association StudiesGenetic VariationGenotypePhenotypeQuantitative Trait LociQuantitative Trait, HeritableTriticum

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28264068

Citation

Nishijima, Ryo, et al. "Quantitative Trait Locus Analysis for Spikelet Shape-related Traits in Wild Wheat Progenitor Aegilops Tauschii: Implications for Intraspecific Diversification and Subspecies Differentiation." PloS One, vol. 12, no. 3, 2017, pp. e0173210.
Nishijima R, Okamoto Y, Hatano H, et al. Quantitative trait locus analysis for spikelet shape-related traits in wild wheat progenitor Aegilops tauschii: Implications for intraspecific diversification and subspecies differentiation. PLoS One. 2017;12(3):e0173210.
Nishijima, R., Okamoto, Y., Hatano, H., & Takumi, S. (2017). Quantitative trait locus analysis for spikelet shape-related traits in wild wheat progenitor Aegilops tauschii: Implications for intraspecific diversification and subspecies differentiation. PloS One, 12(3), e0173210. https://doi.org/10.1371/journal.pone.0173210
Nishijima R, et al. Quantitative Trait Locus Analysis for Spikelet Shape-related Traits in Wild Wheat Progenitor Aegilops Tauschii: Implications for Intraspecific Diversification and Subspecies Differentiation. PLoS One. 2017;12(3):e0173210. PubMed PMID: 28264068.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quantitative trait locus analysis for spikelet shape-related traits in wild wheat progenitor Aegilops tauschii: Implications for intraspecific diversification and subspecies differentiation. AU - Nishijima,Ryo, AU - Okamoto,Yuki, AU - Hatano,Hitoshi, AU - Takumi,Shigeo, Y1 - 2017/03/06/ PY - 2016/11/29/received PY - 2017/02/16/accepted PY - 2017/3/7/entrez PY - 2017/3/7/pubmed PY - 2017/8/26/medline SP - e0173210 EP - e0173210 JF - PloS one JO - PLoS One VL - 12 IS - 3 N2 - Wild diploid wheat Aegilops tauschii, the D-genome progenitor of common wheat, carries large genetic variation in spikelet and grain morphology. Two differentiated subspecies of Ae. tauschii, subspecies tauschii and strangulata, have been traditionally defined based on differences in spikelet morphology. Here, we first assessed six spikelet shape-related traits among 199 Ae. tauschii accessions, and found that the accessions belonging to TauL1major lineage produced significantly longer spikes, higher spikelet density, and shorter, narrower spikelets than another major lineage, TauL2, in which the strangulata accessions are included. Next, we performed quantitative trait locus (QTL) analysis of the spikelet and grain shape using three mapping populations derived from interlineage crosses between TauL1 and TauL2 to identify the genetic loci for the morphological variations of the spikelet and grain shape in Ae. tauschii. Three major QTL regions for the examined traits were detected on chromosomes 3D, 4D and 7D. The 3D and 4D QTL regions for several spikelet shape-related traits were conserved in the three mapping populations, which indicated that the 3D and 4D QTLs contribute to divergence of the two major lineages. The 7D QTLs were found only in a mapping population from a cross of the two subspecies, suggesting that these 7D QTLs may be closely related to subspecies differentiation in Ae. tauschii. Thus, QTL analysis for spikelet and grain morphology may provide useful information to elucidate the evolutionary processes of intraspecific differentiation. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/28264068/Quantitative_trait_locus_analysis_for_spikelet_shape_related_traits_in_wild_wheat_progenitor_Aegilops_tauschii:_Implications_for_intraspecific_diversification_and_subspecies_differentiation_ L2 - https://dx.plos.org/10.1371/journal.pone.0173210 DB - PRIME DP - Unbound Medicine ER -