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141397 - Effect of GA sensitive Rht18 and GA insensitive Rht-D1b dwarfing genes on vegetative and reproductive growth in bread wheat.pdf (909.67 kB)

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

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posted on 2023-05-20, 18:42 authored by Tang, T, Tina AcunaTina Acuna, Spielmeyer, W, Richards, RA
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.

History

Publication title

Journal of Experimental Botany

Volume

72

Article number

eraa481

Number

eraa481

Pagination

445-458

ISSN

0022-0957

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Oxford Univ Press

Place of publication

Great Clarendon St, Oxford, England, Ox2 6Dp

Rights statement

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, https://doi.org/10.1093/jxb/eraa481 is available online at:https://academic.oup.com/jxb/article/72/2/445/5929756 on the OUP website, DOI https://doi.org/10.1093/jxb/eraa481

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  • Restricted

Socio-economic Objectives

Wheat

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