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Overcoming the trade-off between grain weight and number in wheat by the ectopic expression of expansin in developing seeds leads to increased yield potential

Creator: Calderini, D.F.
Creator: Castillo, F.M.
Creator: Arena, A.
Creator: Molero, G.
Creator: Reynolds, M.P.
Creator: Craze, M.
Creator: Bowden, S.
Creator: Milner, M.J.
Creator: Wallington, E.J.
Creator: Dowle, A.
Creator: Gomez, L.D.
Creator: McQueen-Mason, S.J.
Year: 2021
Language: English
Publisher: Wiley
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
Type: Article
Place of Publication: United Kingdom
Pages: 629-640
Issue: 2
Volume: 230
DOI: 10.1111/nph.17048
Keywords: Expansin Protein
Keywords: Grain Number
Keywords: Grain Weight
Keywords: Trade-Offs
Description: Wheat is the most widely grown crop globally, providing 20% of all human calories and protein. Achieving step changes in genetic yield potential is crucial to ensure food security, but efforts are thwarted by an apparent trade-off between grain size and number. Expansins are proteins that play important roles in plant growth by enhancing stress relaxation in the cell wall, which constrains cell expansion. Here, we describe how targeted overexpression of an α-expansin in early developing wheat seeds leads to a significant increase in grain size without a negative effect on grain number, resulting in a yield boost under field conditions. The best-performing transgenic line yielded 12.3% higher average grain weight than the control, and this translated to an increase in grain yield of 11.3% in field experiments using an agronomically appropriate plant density. This targeted transgenic approach provides an opportunity to overcome a common bottleneck to yield improvement across many crops.
Agrovoc: GRAIN
Agrovoc: GRASSES
ISSN: 0028-646X
Journal: New Phytologist

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

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