Journal Article

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Environmental Pollution

Environ.Pollut.

1980/04

21

4

287

306

0269-7491

Unknown(0)

Albus rubra (Bong.) was grown for three months in a greenhouse and given 0, 6, 12, 31 and 62 μg cadmium/litre 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 and the number of starch grains in root xylem parenchyma cells tripled as the cadmium concentration increased from 12 to 62 μg/litre 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 μg/litre. Observations of root and nodule cell ultrastructure of Albus 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 host plant cells.

cadmium, animal experiment, vascular plant, plant, plant root

Embase

Embase

Wickliff,C., Evans,H. J.

Wickliff, Carlos, Environm. Prot. Agency, Terrestrial Syst. Div., Corvallis, Ore. 97330

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1980