Lancaster EPrints

Water relations of the tos1 tomato mutant at contrasting evaporative demands.

Jurado, Olivia and Albacete, Alfonso and Martínez-Ballesta, M. Carmen and Carvajal, Micaela and Pérez-Alfocea, Francisco and Dodd, Ian C. and Romero-Aranda, M. Remedios (2009) Water relations of the tos1 tomato mutant at contrasting evaporative demands. Physiologia Plantarum, 137 (1). pp. 36-43. ISSN 0031-9317

Full text not available from this repository.

Abstract

The tos1 (tomato osmotically sensitive) mutant, isolated from an in vitro screen of root growth during osmotic stress, was less sensitive to exogenous ABA, but accumulated more ABA under osmotic stress than WT plants. We assessed growth and water relations characteristics of hydroponically grown tos1 seedlings (in the absence of osmotic stress) at low and high evaporative demands. Growth of tos1 was severely inhibited at both high and low evaporative demands. Twenty DAS, WT and tos1 genotypes had a similar leaf water and turgor potential, but mature tos1 plants (45 day old) showed a significant diurnal loss of leaf turgor, with recovery overnight. Increased evaporative demand increased turgor loss of tos1 plants. High evaporative demand at the beginning of the day decreased stomatal conductance of tos1, without diurnal recovery, thus whole plant transpiration was decreased. De-topped tos1 seedlings showed decreased root hydraulic conductance and had a 1.4-fold increase in root ABA concentration. Impaired root function of tos1 plants failed to meet transpirational water demand and resulted in shoot turgor loss, stomatal closure and growth inhibition.

Item Type: Article
Journal or Publication Title: Physiologia Plantarum
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 30892
Deposited By: Mr Richard Ingham
Deposited On: 10 Dec 2009 10:32
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2013 19:44
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/30892

Actions (login required)

View Item