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Enhanced transpiration rate in the high pigment 1 tomato mutant and its physiological significance

Carvalho, R. F. and Aidar, S. T. and Azevedo, R. A. and Dodd, I. C. and Peres, L. E. P. (2011) Enhanced transpiration rate in the high pigment 1 tomato mutant and its physiological significance. Plant Biology, 13 (3). pp. 546-550. ISSN 1435-8603

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Abstract

Tomato high pigment (hp) mutants represent an interesting horticultural resource due to their enhanced accumulation of carotenoids, flavonoids and vitamin C. Since hp mutants are known for their exaggerated light responses, the molecules accumulated are likely to be antioxidants, recruited to deal with light and others stresses. Further phenotypes displayed by hp mutations are reduced growth and an apparent disturbance in water loss. Here, we examined the impact of the hp1 mutation and its near isogenic line cv Micro-Tom (MT) on stomatal conductance (gs), transpiration (E), CO2 assimilation (A) and water use efficiency (WUE). Detached hp1 leaves lost water more rapidly than control leaves, but this behaviour was reversed by exogenous abscisic acid (ABA), indicating the ability of hp1 to respond to this hormone. Although attached hp1 leaves had enhanced gs, E and A compared to control leaves, genotypic differences were lost when water was withheld. Both instantaneous leaf-level WUE and long-term whole plant WUE did not differ between hp1 and MT. Our results indicate a link between exaggerated light response and water loss in hp1, which has important implications for the use of this mutant in both basic and horticultural research.

Item Type: Article
Journal or Publication Title: Plant Biology
Uncontrolled Keywords: Light response ; tomato mutant ; transpiration ; water use efficiency ; HIGH-PIGMENT ; ABSCISIC-ACID ; DARK-GREEN ; IN-VITRO ; ARABIDOPSIS ; SENSITIVITY ; PHENOTYPE ; ETHYLENE ; MUTATION ; HOMOLOG
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 50440
Deposited By: ep_importer_pure
Deposited On: 19 Oct 2011 15:19
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2013 22:47
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/50440

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