Transfer of a starch phenotype from wild wheat to bread wheat by deletion of a locus controlling B-type starch granule content

Journal of Experimental Botany
Tansy ChiaKay Trafford

Abstract

Our previous genetic analysis of a tetraploid wild wheat species, Aegilops peregrina, predicted that a single gene per haploid genome, Bgc-1, controls B-type starch granule content in the grain. To test whether bread wheat (Triticum aestivum L.) has orthologous Bgc-1 loci, we screened a population of γ-irradiated bread wheat cv. Paragon for deletions of the group 4 chromosomes spanning Bgc-1. Suitable deletions, each encompassing ~600-700 genes, were discovered for chromosomes 4A and 4D. These two deletions are predicted to have 240 homoeologous genes in common. In contrast to single deletion mutant plants, double deletion mutants were found to lack B-type starch granules. The B-less grains had normal A-type starch granule morphology, normal overall starch content, and normal grain weight. In addition to variation in starch granule size distribution, the B-less wheat grains differed from controls in grain hardness, starch swelling power, and amylose content. We believe that these B-less wheat plants are the only Triticeae cereals available that combine substantial alterations in starch granule size distribution with minimal impact on starch content.

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Citations

Oct 31, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Jian XiaYueming Yan
Nov 20, 2018·Journal of Experimental Botany·David Seung, Alison M Smith
Dec 14, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Marianna PasquarielloPaul Nicholson
May 31, 2020·Journal of Experimental Botany·Benjamin HalesPaul Nicholson
Dec 17, 2019·Journal of Experimental Botany·James R Lloyd
Sep 25, 2021·Journal of the Science of Food and Agriculture·Xuteng ZhangQiantao Jiang

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