Attenuated accumulation of jasmonates modifies stomatal responses to water deficit

De Ollas Valverde, Carlos Jose and Arbona, Vicent and Gomez-Cadenas, Aurelio and Dodd, Ian Charles (2018) Attenuated accumulation of jasmonates modifies stomatal responses to water deficit. Journal of Experimental Botany, 69 (8). pp. 2103-2116. ISSN 0022-0957

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Abstract

To determine whether drought-induced root jasmonates (JA, jasmonic acid and JA-Ile, jasmonic acid iso-leucine) accumulation affected shoot responses to drying soil, near isogenic wild type (WT) tomato (Solanum lycopersicum cv. Castlemart) and the def-1 mutant (which fails to accumulate jasmonates during water deficit) were self- and reciprocally-grafted. Rootstock hydraulic conductance was entirely rootstock-dependent and significantly lower in def-1, yet def-1 scions maintained a higher leaf water potential as the soil dried due to their lower stomatal conductance (gs). Stomatal sensitivity to drying soil (the slope of gs versus soil water content) was low in def-1 self grafts but was normalised by grafting onto WT rootstocks. Although soil drying increased OPDA (a JA-precursor and putative antitranspirant) concentrations in def-1 scions, foliar JA accumulation was negligible and foliar ABA accumulation reduced compared to WT scions. A WT rootstock increased drought-induced ABA and JA accumulation in def-1 scions, but decreased OPDA accumulation. Xylem-borne jasmonates were biologically active, since supplying exogenous JA via the transpiration stream to detached leaves decreased transpiration of WT seedlings but had the opposite effect in def-1. Thus foliar accumulation of both ABA and JA at WT levels is required for both maximum (well watered) gs and stomatal sensitivity to drying soil.

Item Type: Journal Article
Journal or Publication Title: Journal of Experimental Botany
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1300/1314
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 124265
Deposited By: ep_importer_pure
Deposited On: 26 Mar 2018 09:28
Refereed?: Yes
Published?: Published
Last Modified: 19 Feb 2020 04:28
URI: https://eprints.lancs.ac.uk/id/eprint/124265

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