ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Photosystem I activity of chloroplasts isolated from 21 days old maize seedlings (Zea mays L. cv. Hidosil) cultivated in a nutrient solution containing different concentrations of Cd (10,20,30μM) was investigated. Cd markedly decreased ferredoxin(Fd)-dependent NADP+ photoreduction, while it had no effect on electron transport from 2. 6-dichlorophenolindophenol to methyl viologen, indicating that the metal interferred with electron transport on the reducing side of photosystem I. The decrease in electron transport correlated with a low Fd content, which in turn was correlated with a low Fe concentration, suggesting Cd-induced Fe deficiency. In in vitro experiments direct Cd inhibition of Fd-dependent NADP+ photoreduction required much higher Cd concentrations than those observed in Cd-treated plants.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1993.tb00142.x
Permalink