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2017 ; 68
(20
): 5497-5509
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Transfer of a starch phenotype from wild wheat to bread wheat by deletion of a
locus controlling B-type starch granule content
#MMPMID29099990
Chia T
; Adamski NM
; Saccomanno B
; Greenland A
; Nash A
; Uauy C
; Trafford K
J Exp Bot
2017[Nov]; 68
(20
): 5497-5509
PMID29099990
show ga
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 ?-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.