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Water economy and photosynthesis of the CAM plant Senecio medley‐woodii during increasing drought
Author(s) -
RUESS B. R.,
FERRARI S.,
ELLER B. M.
Publication year - 1988
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/j.1365-3040.1988.tb01800.x
Subject(s) - transpiration , photosynthesis , senecio , crassulacean acid metabolism , economic shortage , botany , horticulture , environmental science , biology , chemistry , linguistics , philosophy , government (linguistics)
CO 2 gas exchange, transpiration and water uptake of the succulent Senecio medley‐woodii were monitored simultaneously during a 10 day period of increasing drought. The measurements were performed with a combination of a CO 2 gas exchange chamber and a potometer system. Further, leaf water relations and CO 2 gas exchange of a branched potted plant were measured during 15 days of water shortage. The enhancement of CO 2 dark fixation at the beginning of drought modifies the leaf water relations according to the increased malate accumulation during the dark period. The enhancement of water uptake from dusk to dawn corresponds to the increase of Ψ leaf during the same period. Therefore at the beginning of drought a short time improvement of plant water status through the increased CO 2 dark fixation and malate accumulation can be maintained.