Abstract: With the development of techniques in molecular biology, many high-efficient and reliable DNA molecular markers came forth in succession in past twenty years. In this paper, the basic principals and technical characteristics of estricted fragment length polymorphism (RFLP), microsatellites morphism/simple equence repeat (SSR), random amplified polymorphic DNA (RAPD), and amplified fragment length polymorphism (AFLP) were summarized, and the application of DNA ecular markers in conservation biology,e.g., in the studies of population genetics of endangered species, factors causing danger, and conservation strategies, was also introduced.

Key words: Zea mays, Allelochemical, Cyclic hydroxamic acids, Exudation