Effect of acute UV irradiation of barley in different stages of organogenesis on yield

摘要

The negative effect of acute barley irradiation depends both on the spectrum of UV radiation and on the stage of plant development. UV-B radiation, having a higher photon energy, has the greater negative effect compared to UV-A radiation at the same dose of irradiation. During the vegetation, barley is the most sensitive to the influence of ultraviolet at the Ⅱ-V stages of organogenesis (in the transition from the vegetative to the generative stage of development). The adverse effect of UV-B radiation on the grain yield shows in the substantial reduction of flowers in the ear during their laying and probably in the pollen sterility.