Brassinosteroids – A new class of phytohormones
نویسندگان
چکیده
Brassinosteroids are a new group of plant hormones with significant growth-promoting activity. Brassinosteroids were first isolated and characterized from the pollen of rape plant, Brassica napus L. Subsequently, they have so far been reported from 44 plants and are regarded probably ubiquitous in the plant kingdom. Brassinosteroids are considered as hormones with pleiotropic effects, as they influence varied developmental processes like growth, germination of seeds, rhizogenesis, flowering and senescence. Brassinosteroids also confer resistance to plants against various abiotic stresses. The article reviews the work relating to their discovery, distribution, physiological functions and economic importance. In addition, the case of brassinosteroids as the sixth group of phytohormones is discussed taking into account how they satisfy the basic features of plant hormones and evidences that they are essential for plant growth and development.
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