Breadfruit (Artocarpus altilis) gibberellin 2-oxidase genes in stem elongation and abiotic stress response

Zhou, Yuchan and Underhill, Steven J. R. (2016) Breadfruit (Artocarpus altilis) gibberellin 2-oxidase genes in stem elongation and abiotic stress response. Plant Physiology and Biochemistry, 98 81-88. doi:10.1016/j.plaphy.2015.11.012


Author Zhou, Yuchan
Underhill, Steven J. R.
Title Breadfruit (Artocarpus altilis) gibberellin 2-oxidase genes in stem elongation and abiotic stress response
Formatted title
Breadfruit (Artocarpus altilis) gibberellin 2-oxidase genes in stem elongation and abiotic stress response
Journal name Plant Physiology and Biochemistry   Check publisher's open access policy
ISSN 0981-9428
1873-2690
Publication date 2016-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.plaphy.2015.11.012
Open Access Status Not Open Access
Volume 98
Start page 81
End page 88
Total pages 8
Place of publication Issy les Moulineaux, Cedex, France
Publisher Elsevier Masson
Language eng
Formatted abstract
Breadfruit (Artocarpus altilis) is a traditional staple tree crop in the Oceania. Susceptibility to windstorm damage is a primary constraint on breadfruit cultivation. Significant tree loss due to intense tropical windstorm in the past decades has driven a widespread interest in developing breadfruit with dwarf stature. Gibberellin (GA) is one of the most important determinants of plant height. GA 2-oxidase is a key enzyme regulating the flux of GA through deactivating biologically active GAs in plants. As a first step toward understanding the molecular mechanism of growth regulation in the species, we isolated a cohort of four full-length GA2-oxidase cDNAs, AaGA2ox1- AaGA2ox4 from breadfruit. Sequence analysis indicated the deduced proteins encoded by these AaGA2oxs clustered together under the C19 GA2ox group. Transcripts of AaGA2ox1, AaGA2ox2 and AaGA2ox3 were detected in all plant organs, but exhibited highest level in source leaves and stems. In contrast, transcript of AaGA2ox4 was predominantly expressed in roots and flowers, and displayed very low expression in leaves and stems. AaGA2ox1, AaGA2ox2 and AaGA2ox3, but not AaGA2ox4 were subjected to GA feedback regulation where application of exogenous GA3 or gibberellin biosynthesis inhibitor, paclobutrazol was shown to manipulate the first internode elongation of breadfruit. Treatments of drought or high salinity increased the expression of AaGA2ox1, AaGA2ox2 and AaGA2ox4. But AaGA2ox3 was down-regulated under salt stress. The function of AaGA2oxs is discussed with particular reference to their role in stem elongation and involvement in abiotic stress response in breadfruit.
Keyword Breadfruit (Artocarpus altilis)
Drought
Dwarfing
Gibberellin 2-oxidase
Salinity
Stem elongation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2016 Collection
 
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Created: Thu, 28 Jan 2016, 07:17:27 EST by Yuchan Zhou on behalf of Centre for Plant Science