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Gasperini, D.; Greenland, A.; Hedden, P.; Dreos, R.; Harwood, W.; Griffiths, S. Genetic and physiological analysis of Rht8 in bread wheat: an alternative source of semi-dwarfism with a reduced sensitivity to brassinosteroids J Exp Bot 63, 4419-4436, (2012) DOI: 10.1093/jxb/ers138
Over the next decade, wheat grain production
must increase to meet the demand of a fast growing human population. One
strategy to meet this challenge is to raise wheat productivity by
optimizing plant stature. The Reduced height 8 (Rht8) semi-dwarfing gene
is one of the few, together with the Green Revolution genes, to reduce
stature of wheat (Triticum aestivum L.), and improve lodging resistance,
without compromising grain yield. Rht8 is widely used in dry
environments such as Mediterranean countries where it increases plant
adaptability. With recent climate change, its use could become
increasingly important even in more northern latitudes. In the present
study, the characterization of Rht8 was furthered. Morphological
analyses show that the semi-dwarf phenotype of Rht8 lines is due to
shorter internodal segments along the wheat culm, achieved through
reduced cell elongation. Physiological experiments show that the reduced
cell elongation is not due to defective gibberellin biosynthesis or
signalling, but possibly to a reduced sensitivity to brassinosteroids.
Using a fine-resolution mapping approach and screening 3104 F2
individuals of a newly developed mapping population, the Rht8 genetic
interval was reduced from 20.5 cM to 1.29 cM. Comparative genomics with
model genomes confined the Rht8 syntenic intervals to 3.3 Mb of the
short arm of rice chromosome 4, and to 2 Mb of Brachypodium distachyon
chromosome 5. The very high resolution potential of the plant material
generated is crucial for the eventual cloning of Rht8.