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Expression of chloroplastic genes during autumnal senescence in a deciduous tree Populus deltiodes
Author(s) -
Reddy M.S. Srinivasa,
Trivedi Prabodh K.,
Tuli Rakesh,
Sane Prafullachandra V.
Publication year - 1997
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549700204481
Subject(s) - senescence , deciduous , biology , botany , photosynthesis , photosystem , gene , horticulture , photosystem ii , microbiology and biotechnology , genetics
In Populus deltoides, a deciduous tree, the development on new leaves starts in the month of March, the leaves reach maturity by October and fall by December. Changes in the composition and function of the photosynthetic apparatus were analysed during autumnal senescence. With the progress of senescence, there was an initial increase followed by a decrease in the steady state levels of psbA, psbD/C and psaA/B gene transcripts. Decrease in the steady state level of D1 protein was faster than that of Cytochrome f. The decline in LHCP level was seen only during late senescence. Although the leaves continue to look green and healthy till late November, the electron transport driven by individual photosystems started declining by October end suggesting the onset of senescence.