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Volume :22 Issue : 1 1995      Add To Cart                                                                    Download

Effect of cadmium and mercury on seed germination and early seedling growth of rice and alfalfa

Auther : A. A. AL-HELAL

 Botany and Microbiology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia

 ABSTRACT

The effects of different concentrations (0.05 to 50mM) of CdC1 and HgCL2 and t. concentrations of KCI (50 & 200mM) on percentage seed germination after 2 and 5 days of incubation, and on seedling growth after 5 days of incubation of rice and alfalfa (cultivars - Al-Ahssa) were investigated. Seed germination and seedling growth were inhibited significantly by CdCL2 and HgCL2. Germination inhibition was completely due to heavy metal toxicity, while seedling growth inhibition was mostly due to the toxicity of heavy metals as evident from the effect of KCI. Rice seed germination was more tolerant to heavy metals.

In rice, root growth was more sensitive to heavy metals than shoot growth, while the latter was more sensitive to KCI stress.

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