Abstract:
:The contribution of changes in stomatal conductance and metabolism in determining heterogeneous photosynthesis inhibition during dehydration and abscisic acid (ABA) feeding was investigated using detached leaves of Rosa rubiginosa L. The steady-state and maximal rates of electron transport under a transient high CO(2) concentration were monitored using chlorophyll fluorescence imaging. The decrease in electron transport rate induced by dehydration and ABA treatment almost reverted to the control rate under transient high CO(2) availability. Therefore, inhibition of photosynthesis was mainly mediated through stomatal closure. However, since reversion was not complete, a metabolic inhibition was also identified as a decrease in the maximal electron transport rate driven by carboxylation. Under dehydration or ABA feeding, as under low ambient CO(2) treatment, in 21% or 0.4% O(2), the lower the steady-state electron transport was, the lower was the maximal electron transport rate during transient high CO(2) availability. We conclude that low CO(2) availability reduced the capacity of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) to drive electron transport. The potential contribution of Rubisco deactivation mediated by stomatal closure is discussed.
journal_name
Plantajournal_title
Plantaauthors
Meyer S,Genty Bdoi
10.1007/s004250050661subject
Has Abstractpub_date
1999-11-01 00:00:00pages
126-31issue
1eissn
0032-0935issn
1432-2048pii
92100126.425journal_volume
210pub_type
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