Long term water stress inactivates Rubisco in subterranean clover

Medrano, H. and Parry, M. A J and Socias, X. and Lawlor, D. W. (1997) Long term water stress inactivates Rubisco in subterranean clover. Annals of Applied Biology, 131 (3). pp. 491-501. ISSN 0003-4746

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Abstract

In long-term field experiments, during consecutive years, microswards of subterranean clover were irrigated to minimise water deficits or subjected to progressively increasing drought over 30 days. Both leaf water potential and relative water content steadily decreased during the experiments. Plants affected by drought grew more slowly and photosynthesis was decreased. Photosynthetic rate (A) and Rubisco were analysed in relation to midday water potentials and relative water contents. The difference in A between droughted and irrigated plants increased progressively, in part as a result of decreased stomatal conductance and CO2 concentration within leaf (Ci). However, A-Ci curves suggest that the photosynthetic capacity in plants experiencing long-term stress was reduced by 50% when compared with irrigated plants. Drought decreased both the initial and the total Rubisco activity per unit area in a similar way but did not reduce the amount of Rubisco protein per unit leaf area. Thus, the specific activity of Rubisco, rather than its activation state, decreased suggesting that under water stress the active sites were blocked by inhibitors.

Item Type: Journal Article
Journal or Publication Title: Annals of Applied Biology
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1100/1102
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 76036
Deposited By: ep_importer_pure
Deposited On: 21 Oct 2015 05:04
Refereed?: Yes
Published?: Published
Last Modified: 20 Nov 2019 07:07
URI: https://eprints.lancs.ac.uk/id/eprint/76036

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