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Identification of a major QTL controlling the content of B-type starch granules in Aegilops.
- Source :
- Journal of Experimental Botany; Mar2011, Vol. 62 Issue 6, p2217-2228, 12p, 1 Color Photograph, 2 Diagrams, 2 Charts, 2 Graphs
- Publication Year :
- 2011
-
Abstract
- Starch within the endosperm of most species of the Triticeae has a unique bimodal granule morphology comprising large lenticular A-type granules and smaller near-spherical B-type granules. However, a few wild wheat species (Aegilops) are known to lack B-granules. Ae. peregrina and a synthetic tetraploid Aegilops with the same genome composition (SU) were found to differ in B-granule number. The synthetic tetraploid had normal A- and B-type starch granules whilst Ae. peregrina had only A-granules because the B-granules failed to initiate. A population segregating for B-granule number was generated by crossing these two accessions and was used to study the genetic basis of B-granule initiation. A combination of Bulked Segregant Analysis and QTL mapping identified a major QTL located on the short arm of chromosome 4S that accounted for 44.4% of the phenotypic variation. The lack of B-granules in polyploid Aegilops with diverse genomes suggests that the B-granule locus has been lost several times independently during the evolution of the Triticeae. It is proposed that the B-granule locus is susceptible to silencing during polyploidization and a model is presented to explain the observed data based on the assumption that the initiation of B-granules is controlled by a single major locus per haploid genome. [ABSTRACT FROM PUBLISHER]
- Subjects :
- AEGILOPS
STARCH
ENDOSPERM
PLANT genomes
PLANT genetics
Subjects
Details
- Language :
- English
- ISSN :
- 00220957
- Volume :
- 62
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Experimental Botany
- Publication Type :
- Academic Journal
- Accession number :
- 59528379
- Full Text :
- https://doi.org/10.1093/jxb/erq423