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The Effect of Cadmium on Net Photosynthesis, Transpiration, and Dark Respiration of Excised Silver Maple Leaves
Author(s) -
LAMOREAUX ROBERT J.,
CHANEY WILLIAM R.
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb02569.x
Subject(s) - transpiration , photosynthesis , respiration , cadmium , carbon dioxide , botany , chemistry , maple , horticulture , zoology , biology , organic chemistry
Excised leaves of silver maple (Acer saccharinum L.) exposed to 0, 0.045, 0.090, or 0.180 m M Cd 24 exhibited reduced net photosynthesis and transpiration, and increased dark respiration. Rates of net photosynthesis and transpiration diminished with time and were strongly correlated with solution concentration and tissue content of Cd 24 , Net photosynthesis and transpiration were reduced to 18 and 21%, respectively, of the untreated controls after 64 h. Dark respiration increased as much as 193% of the untreated controls but was poorly correlated with solution concentration or tissue content of Cd 24 , Diffusive resistances of leaves to carbon dioxide and water vapor transfer increased with both increasing Cd 24 concentration and time. These findings are discussed in relation to stomatal function.