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Effect of Cd on Photosynthesis and Transpiration of Excised Leaves of Corn and Sunflower
Author(s) -
BAZZAZ F. A.,
ROLFE G. L.,
CARLSON ROGER W.
Publication year - 1974
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.1399-3054.1974.tb03154.x
Subject(s) - sunflower , transpiration , photosynthesis , chemistry , helianthus annuus , helianthus , botany , horticulture , biology , agronomy
Detached corn and sunflower leaves exposed to various concentrations of Cd, supplied as CdCl 2 , exhibit reduced photosynthesis and transpiration. The reduction is dependent on the concentration of CdCl 2 solution and generally becomes more pronounced with time. In sunflower, net photosynthesis and transpiration are completely inhibited within 45 min after the introduction of 18 m M Cd. Within two hours net photosynthesis is reduced to 40% and 70% of maximum after the introduction of 9 and 4.5 m M Cd respectively. In corn the trend of photo‐synthetic response to Cd is similar to that in sunflower except that the inhibition in corn is more pronounced at all treatment levels. A strong linear relationship between photosynthesis and transpiration inhibition is obtained in both species suggesting that Cd contamination induces stomatal closure.