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Increased pericarp cell length underlies a major QTL for grain weight in hexaploid wheat

Jemima Brinton, James Simmonds, Francesca Minter, Michelle Leverington-Waite, John Snape, View ORCID ProfileCristobal Uauy
doi: https://doi.org/10.1101/117937
Jemima Brinton
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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James Simmonds
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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Francesca Minter
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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Michelle Leverington-Waite
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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John Snape
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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Cristobal Uauy
John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, United Kingdom
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  • ORCID record for Cristobal Uauy
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Summary

  • Crop yields must increase to address food insecurity. Grain weight, determined by grain length and width, is an important yield component, but our understanding of the underlying genes and mechanisms is limited.

  • We used genetic mapping and near isogenic lines (NILs) to identify, validate and fine map a major quantitative trait loci (QTL) on wheat chromosome 5A associated with grain weight. Detailed phenotypic characterisation of developing and mature grains from the NILs was performed.

  • We identified a stable and robust QTL associated with a 6.9 % increase in grain weight. The positive interval leads to 4.0 % longer grains, with differences first visible twelve days post fertilization. This grain length effect was fine-mapped to a 4.3 cM interval. The locus also has a pleiotropic effect on grain width (1.5 %) during late grain development that determines the relative magnitude of the grain weight increase. Positive NILs have increased maternal pericarp cell length, an effect which is independent of absolute grain length.

  • These results provide direct genetic evidence that pericarp cell length affects final grain size and weight in polyploid wheat. We propose that combining genes which control distinct biological mechanisms, such as cell expansion and proliferation, will enhance crop yields.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted March 17, 2017.
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Increased pericarp cell length underlies a major QTL for grain weight in hexaploid wheat
Jemima Brinton, James Simmonds, Francesca Minter, Michelle Leverington-Waite, John Snape, Cristobal Uauy
bioRxiv 117937; doi: https://doi.org/10.1101/117937
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Increased pericarp cell length underlies a major QTL for grain weight in hexaploid wheat
Jemima Brinton, James Simmonds, Francesca Minter, Michelle Leverington-Waite, John Snape, Cristobal Uauy
bioRxiv 117937; doi: https://doi.org/10.1101/117937

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