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Control of late maturity alpha-amylase in wheat by the dwarfing gene Rht - D1b and genes on the 1B/1R translocation

Published on Aug 1, 2013in Molecular Breeding1.862
· DOI :10.1007/s11032-013-9881-5
A. D. Farrell8
Estimated H-index: 8
(UWI: University of the West Indies),
P. S. Kettlewell2
Estimated H-index: 2
(Harper Adams University)
+ 4 AuthorsPeter Jack9
Estimated H-index: 9
Abstract
The occurrence of late maturity alpha-amylase (LMA) was investigated using two doubled haploid wheat populations segregating for the dwarfing gene Rht-D1b and the 1B/1R translocation. Genotypes were assessed in the field and in controlled environments where a cold-shock treatment was used to induce LMA. Results from field-grown genotypes from the cross Spark × Rialto suggest that the absence of Rht-D1b or the presence of the 1B/1R translocation increases the expression of LMA.These two genetic factors were found to act independently and to have a positive interaction (complementary epistasis). In Option × Potent genotypes fixed for Rht-D1b, the 1B/1R effect was similar to that seen in the equivalent Spark × Rialto genotypes. Under controlled environment conditions, genotypes with the 1B/1R translocation showed a higher occurrence of LMA under both control and cold-shock conditions. 1B/1R was present in the majority of genotypes expressing LMA under control and cold-shock conditions. The results point to the novel finding that the 1B/1R translocation increases the expression of alpha-amylase in LMA-prone germplasm independently of effects of Rht-D1b, whereas previously it had been thought to act by a modification of the Rht-D1b effect.
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