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Antimycin A sensitive pathway independent from PGR5 cyclic electron transfer triggers non-photochemical reduction of PQ pool and state transitions in Arabidopsis thaliana

Paper ID Volume ID Publish Year Pages File Format Full-Text
29397 44384 2015 10 PDF Available
Title
Antimycin A sensitive pathway independent from PGR5 cyclic electron transfer triggers non-photochemical reduction of PQ pool and state transitions in Arabidopsis thaliana
Abstract

•Non-photochemical reduction of PQ pool is responsible for temperature induced state transitions.•Phosphorylated LHCII is detached from PSII and migrated to PSI under moderate heat.•Chlororespiration and cyclic electron transfer on non-photochemical reduction of PQ pool was studied.•Antimycin A in wt and mutants revealed its inhibitory action on state transitions.•Antimycin A sensitive pathway is independent from PGR5 dependent cyclic electron transfer.

We investigated the mechanism involved in triggering state transitions at 40 °C in Arabidopsis thaliana. Leaves (1–6 week old) exposed to 40 °C exhibited state II transition indicating its role as one of the earliest stress responsive mechanism apart from regulation of light energy distribution between photosystem (PS)II and PSI. Post illumination transients (rise in Fo′) revealed that non-photochemical reduction of PQ pool at 40 °C in dark is responsible for activation of STN7 kinase, consequently light harvesting complex (LHC)II phosphorylation leading to state II condition. Later, in pgr5 mutant, non-photochemical reduction of PQ pool was observed indicating the involvement of alternative electron transfer routes. In chlororespiratory mutant crr2-2, state II transition occurred signifying that the reduction of PQ pool is independent from NDH mediated cyclic electron transfer. Further, antimycin A inhibitor studies in wt and mutants revealed its inhibitory action on non-photochemical reduction of PQ pool affecting both LHCII phosphorylation and migration to PSI which leads to state I. Thus, our study showed that antimycin A sensitive pathway independent from PGR5 dependent cyclic electron transfer, is responsible for inducing non-photochemical reduction of PQ pool and state transitions at 40 °C.

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Antimycin A sensitive pathway independent from PGR5 cyclic electron transfer triggers non-photochemical reduction of PQ pool and state transitions in Arabidopsis thaliana
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 146, May 2015, Pages 24–33
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us