Study of phytohormones effects on UV-B stress seeds of thyme species

Thymus species are commonly used as flavoring agents and medicinal plants. Seeds of this plant do not exhibit dormancy and the best time for harvesting this plant is at the beginning of its flowering period (Yadegari, 2015). During the past decades, the thinning of the stratospheric ozone has led to enhanced ultraviolet-B (UV-B) radiation on the earthsurface. UV-B radiation (280-320 nm) represents only 0.3% of the radiation Journal of Herbal Drug