Seed dormancy-A dominant trait in rice (Oryza sativa L.) : A review

摘要

Dormancy is a desirable trait for the adaptation of a species in adverse conditions Rice possesses dormancy specially during rainy season This review gives in brief the research advances on dormancy in rice discussing the problems, types of dormancy,factors influencing dormancy, the mechanisms of dormancy, the genetics behind and the methods to break dormancy. Temperature, relative humidity, the age of seeds and genotypes influence dormancy in rice seeds Seed dormancy in rice is mainly imposed by hull, pericarp/testa and embryo factor Dormancy owing to hull is genetically independent Dormancy is strong in weedy rice Domestication and bleeding activities have elimated alieles at loci for shattering and morphological characteristics of improved ricecultivars. A review on genetics of dormancy is also given.