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Effect of GA sensitive Rht18 and GA insensitive Rht-D1b dwarfing genes on vegetative and reproductive growth in bread wheat


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Tang, T, Botwright Acuna, T ORCID: 0000-0003-2955-2450, Spielmeyer, W and Richards, RA 2020 , 'Effect of GA sensitive Rht18 and GA insensitive Rht-D1b dwarfing genes on vegetative and reproductive growth in bread wheat' , Journal of Experimental Botany , doi: 10.1093/jxb/eraa481.

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Gibberellin (GA) insensitive dwarfing genes Rht-B1b and Rht-D1b that are responsible for the ‘Green Revolution’ have been remarkably successful in wheat improvement globally. However, these alleles result in shorter coleoptiles and reduced vigour and hence poor establishment and growth in some environments. Rht18, on the other hand, is a GA sensitive, dominant gene with potential to overcome some of the early growth limitations associated with Rht-B1b and Rht-D1b. We assessed progeny from both a biparental and backcross population that contained tall, single-dwarf and double-dwarf lines, to determine whether Rht18 differs from Rht-D1b and hence verifying its value in wheat improvement. Progeny with Rht18 had an almost identical height to lines with Rht-D1b, and both were about 26% shorter than the tall lines with the double dwarf 13% shorter again. However, coleoptile length of Rht18 was 42% longer than Rht-D1b. We detected no differences in time to terminal spikelet, anthesis and few differences in stem or spike growth. Both dwarfing genes diverted more dry matter to the spike than tall lines from prior to heading. No differences were detected between Rht18 and Rht-D1b that could prevent the adoption of Rht18 in wheat breeding to overcome some of the limitations associated with the ‘Green Revolution’ genes.

Item Type: Article
Authors/Creators:Tang, T and Botwright Acuna, T and Spielmeyer, W and Richards, RA
Keywords: early growth, stem internodes, assimilate competition, carbohydrate remobilisation
Journal or Publication Title: Journal of Experimental Botany
Publisher: Oxford Univ Press
ISSN: 0022-0957
DOI / ID Number: 10.1093/jxb/eraa481
Copyright Information:

Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved.This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Experimental Botany following peer review. The version of record: Ting Tang, Tina Botwright Acuña, Wolfgang Spielmeyer, Richard A Richards, Effect of gibberellin-sensitive Rht18 and gibberellin-insensitive Rht-D1b dwarfing genes on vegetative and reproductive growth in bread wheat, Journal of Experimental Botany, Volume 72, Issue 2, 2 February 2021, Pages 445–458, is available online at: on the OUP website, DOI

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