Long term water stress inactivates Rubisco in subterranean clover

A - Papers appearing in refereed journals

Medrano, H., Parry, M. A. J., Socias, X. and Lawlor, D. W. 1997. Long term water stress inactivates Rubisco in subterranean clover. Annals of Applied Biology - AAB. 131 (3), pp. 491-501. https://doi.org/10.1111/j.1744-7348.1997.tb05176.x

AuthorsMedrano, H., Parry, M. A. J., Socias, X. and Lawlor, D. W.
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 CO(2) 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.

KeywordsAgriculture, Multidisciplinary
Year of Publication1997
JournalAnnals of Applied Biology - AAB
Journal citation131 (3), pp. 491-501
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1744-7348.1997.tb05176.x
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or code214
413
Project: 011485
PublisherWiley
ISSN0003-4746

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