Lancaster EPrints

Regulation of Rubisco during drought and heat stress in wheat.

Hobson, P. D. and Keys, A. J. and Parry, M. A. and Lea, P. J. (2002) Regulation of Rubisco during drought and heat stress in wheat. Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology, 132 (Supple). S173-S180. ISSN 1095-6433

Full text not available from this repository.

Abstract

The regulation of Rubisco in terms of activation and the presence of inhibitors was assessed in the leaves of wheat plants, in response to drought and heat stress. A decline in the leaf relative water content by 25% caused little change in the initial and total Rubisco activity or activation state. There was, however, some evidence for a decreased amount of Rubisco protein in drought-stressed plants, shown by reduced maximal Rubisco activity and CABP binding. In the droughted plants, there was a significant reduction in the concentration of the ‘daytime inhibitor’ of Rubisco activity, indicating that it did not play an important role during drought stress in this species. High temperature stress caused a reduction in photosynthetic rate. As the temperature was increased from 25 to 40 °C, the photosynthetic rate was reduced by 100%, followed by a 90% reduction in stomatal conductance, although the internal CO2 content increased slightly. The initial and total Rubisco activity and activation state declined with increasing temperature, suggesting a possible perturbation of the heat-labile Rubisco activase activity. The amount of RuBP declined as temperature increased, suggesting a reduction in the flux through the Calvin cycle. The decrease in concentration of the ‘daytime inhibitor’ of Rubisco activity indicated that, as for drought, it did not play an important role during temperature stress in this species.

Item Type: Article
Journal or Publication Title: Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Psychology
Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 10751
Deposited By: Mr Richard Ingham
Deposited On: 23 Jul 2008 15:15
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2013 15:57
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10751

Actions (login required)

View Item