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Genetic dissection of grain size and grain number trade-offs in CIMMYT Wheat Germplasm

Author: Griffiths, S.
Author: Wingen, L.U.
Author: Pietragalla, J.
Author: Garcia, G.
Author: Hasan, A.
Author: Miralles, D.
Author: Calderini, D.F.
Author: Jignaben Bipinchandra Ankleshwaria
Author: Leverington Waite, M.
Author: Simmonds, J.
Author: Snape, J.
Author: Reynolds, M.P.
Year: 2015
Abstract: Grain weight (GW) and number per unit area of land (GN) are the primary components of grain yield in wheat. In segregating populations both yield components often show a negative correlation among themselves. Here we use a recombinant doubled haploid population of 105 individuals developed from the CIMMYT varieties Weebill and Bacanora to understand the relative contribution of these components to grain yield and their interaction with each other. Weebill was chosen for its high GW and Bacanora for high GN. The population was phenotyped in Mexico, Argentina, Chile and the UK. Two loci influencing grain yield were indicated on 1B and 7B after QTL analysis. Weebill contributed the increasing alleles. The 1B effect, which is probably caused by to the 1BL.1RS rye introgression in Bacanora, was a result of increased GN, whereas, the 7B QTL controls GW. We concluded that increased in GW from Weebill 7B allele is not accompanied by a significant reduction in grain number. The extent of the GW and GN trade-off is reduced. This makes this locus an attractive target for marker assisted selection to develop high yielding bold grain varieties like Weebill. AMMI analysis was used to show that the 7B Weebill allele appears to contribute to yield stability.
Format: PDF
Language: English
Publisher: Public Library of Science
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Type: Article
Place of Publication: USA
Pages: art.0118847
Issue: 3
Volume: 10
DOI: 10.1371/journal.pone.0118847
Keywords: CIMMYT
Country of Focus: CHILE
Country of Focus: USA
Agrovoc: WHEAT
Agrovoc: GRAIN
Related Datasets:
Journal: PLoS ONE

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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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