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Differential changes in the electron transport properties of thylakoid membranes during aging of attached and detached leaves, and of isolated chloroplasts
Author(s) -
MISRA A. N.,
BISWAL U. C.
Publication year - 1982
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11587573
Subject(s) - chloroplast , electron transport chain , thylakoid , in vivo , biophysics , dcmu , chemistry , organelle , photochemistry , photosystem ii , in vitro , photosynthesis , biochemistry , biology , microbiology and biotechnology , gene
. Aging of chloroplasts both in vivo and in vitro causes a considerable loss in the 2,6‐dichlorophenol indophenol (DCPIP)‐Hill reaction with water as electron donor. The loss can be reduced by exogenous electron donors like diphenyl carbazide (DPC). suggestive of aging‐induced damage of the oxygen evolving system. Aging also brings about a considerable loss in methylviologen (MV) reduction mediated by Photosystem I (PS I) of chloroplasts with an ascorbate‐DCPIP couple as the electron donating system. The loss in the electron transport ability of the plastids is faster during in vitro compared to in vivo aging of the chloroplasts. Light protects the photo‐electron transport ability of chloroplasts during aging of intact leaves in contrast to its action during aging of the isolated organelles.