Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Effect of Cadmium on the Root and Nodule Ultrastructure of 'Alnus rubra'.
Author Wickliff, Carlos ; Evans, H. J. ;
CORP Author National Heart, Lung, and Blood Inst., Bethesda, MD.
Year Published 1980
Report Number EPA-600/J-80-032;
Stock Number PB80-220056
Additional Subjects Cadmium ; Toxicology ; Plants(Botany) ; Electron microscopy ; Reprints ; Alnus rubra ; Toxic substances
Library Call Number Additional Info Location Last
NTIS  PB80-220056 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 25p
Alnus rubra (Bong.) was grown for three months in a greenhouse and given 0, 6, 12, 31 and 62 migrograms cadmium/liter of nitrogen-free nutrient solution for 11 weeks. Segments of nodules and secondary roots were collected from plants grown at the different Cd levels. Thin sections were made for transmission electron microscopy and the ultrastructure of root and nodule cells was then investigated. Endophyte resorption advanced in the nodules ad the number of starch grains in root xylem parenchyma cells tripled as the cadmium concentrations increased from 12 to 62 micrograms/liter of nutrient solution. Nucleoli increased in prominence in the nuclei of the root xylem parenchyma cells as the cadmium concentration in the nutrient solution was raised from 12 to 62 micrograms/liter. Observations of root and nodule cell ultrastructure of Alnus rubra suggest that cadmium exerts its toxic effect in roots and nodules by decreasing the number of endophyte structures capable of fixing nitrogen and reducing the rate of respiration and growth by hose plant cells.