Loading…
Wheat storage proteins: their genetics and their potential for manipulation by plant breeding
The genes that code for endosperm storage proteins occur at nine complex loci on six different chromosomes. Glu-A1, Glu-B1 and Glu-D1 contain the genes for high molecular mass subunits of glutenin and are close to the centromere on the long arms of chromosomes 1A, 1B and 1D respectively. On the shor...
Saved in:
Published in: | Philosophical transactions of the Royal Society of London. Series B, Biological sciences Biological sciences, 1984-01, Vol.304 (1120), p.359-371 |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The genes that code for endosperm storage proteins occur at nine complex loci on six different chromosomes. Glu-A1, Glu-B1
and Glu-D1 contain the genes for high molecular mass subunits of glutenin and are close to the centromere on the long arms
of chromosomes 1A, 1B and 1D respectively. On the short arms of the same chromosomes, but distant from the centromere, are
Gli-A1, Gli-B1 and Gli-D1. Each of these loci carry three major gene families coding for $\omega$-gliadins,
$\gamma$-gliadins and low molecular mass glutenin subunits. The remaining loci, Gli-A2, Gli-B2 and Gli-D2 occur
near the ends of the short arms of chromosomes 6A, 6B and 6D respectively and each code for $\alpha$- and $\beta$-gliadins.
Recombination of genes within a locus is very rare and has so far been detected only at Glu-B1, at the rate of about one recombinant
in 1000 progeny. Each locus displays allelic variation and this is responsible for differences among varieties in protein
quality for making bread. The protein variants that are associated with good quality are being identified, firstly by analysing
segregating populations and secondly from the development of near-isogenic lines. Current, incomplete, information on the
relative qualities of different alleles at each locus indicates the following order of importance: Glu-1 > Gli-1 > Gli-2.
Landraces of primitive agriculture are being screened for novel proteins. The genes for some of them are being incorporated
into the genomes of commercial wheats. |
---|---|
ISSN: | 0080-4622 0962-8436 1471-2970 2054-0280 |
DOI: | 10.1098/rstb.1984.0031 |