Many basic conceptions of the modern genetics were based on the knowledge of higher plants. The „Allium test“ used by Levan in as early as in 1938 was one of the first tests evaluating the risk of mutagenity of chemical agents influencing living organisms. In the wave of obligatory established tests of influences of chemical agents on the environment plant tests have not been brought off. On international level there is a markable effort to return the plant tests their importance especially with regard to their irreplaceable role of bioindication of environmental pollution directly in nature.