GrainGenes Reference Report: TAG-131-2021
Reference
TAG-131-2021
Title
Identification and characterization of Rht25, a locus on chromosome arm 6AS affecting wheat plant height, heading time, and spike development.
Journal
Theoretical and Applied Genetics
Year
2018
Volume
131
Pages
2021-2035
Author
[ Hide all but 1 of 10 ] Mo Y Vanzetti LS Hale I Spagnolo EJ Guidobaldi F Al-Oboudi J Odle N Pearce S Helguera M Dubcovsky J
Abstract
Understanding genes regulating wheat plant height is important to optimize harvest index and maximize grain yield. In modern wheat varieties grown under high-input conditions, the gibberellin-insensitive semi-dwarfing alleles Rht-B1b and Rht-D1b have been used extensively to confer lodging tolerance and improve harvest index. However, negative pleiotropic effects of these alleles (e.g., poor seedling emergence and reduced biomass) can cause yield losses in hot and dry environments. As part of current efforts to diversify the dwarfing alleles used in wheat breeding, we identified a quantitative trait locus (QHt.ucw-6AS) affecting plant height in the proximal region of chromosome arm 6AS (less than 0.4 cM from the centromere). Using a large segregating population (approx. 2800 gametes) and extensive progeny tests (70-93 plants per recombinant family), we mapped QHt.ucw-6AS as a Mendelian locus to a 0.2 cM interval (144.0-148.3 Mb, IWGSC Ref Seq v1.0) and show that it is different from Rht18. QHt.ucw-6AS is officially designated as Rht25, with Rht25a representing the height-increasing allele and Rht25b the dwarfing allele. The average dwarfing effect of Rht25b was found to be approximately half of the effect observed for Rht-B1b and Rht-D1b, and the effect is greater in the presence of the height-increasing Rht-B1a and Rht-D1a alleles than in the presence of the dwarfing alleles. Rht25b is gibberellin-sensitive and shows significant pleiotropic effects on coleoptile length, heading date, spike length, spikelet number, spikelet density, and grain weight. Rht25 represents a new alternative dwarfing locus that should be evaluated for its potential to improve wheat yield in different environments.
External Databases
DOI: 10.1007/s00122-018-3130-6
Gene
Rht25 (Triticum)
QTL
QHt.ucw-6AS
Summarized in
Dubcovsky J MAS Wheat. Bringing Genomics to the Wheat Fields. Plant height gene Rht25. MAS Wheat. Marker Assisted Selection in Wheat.
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: TAG-131-2021
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||