PMID:22791821

Citation	Gasperini, D, Greenland, A, Hedden, P, Dreos, R, Harwood, W and Griffiths, S (2012) Genetic and physiological analysis of Rht8 in bread wheat: an alternative source of semi-dwarfism with a reduced sensitivity to brassinosteroids. J. Exp. Bot. 63:4419-36
Abstract	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 F(2) 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.
Links	PubMed PMC3421992 Online version:10.1093/jxb/ers138
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
WHEAT:Q0ZA03	involved_in	GO:0009826: unidimensional cell growth	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
WHEAT:Q0ZA03		GO:0009826: unidimensional cell growth	ECO:0000315:		P		As seen in figures 3A-3D, comparison of longitudinal culm cuts from the Rht8 (putative Bri1) lines versus the wild type exhibited shorter cells in the former line, in both the peduncle and internode 1 sections.	complete CACAO 7357

References

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