Abstract: Enhanced UV-B radiation has different effects on different plants, and even, on the different varieties of same plant species. Taking two winter wheat varieties (Keyi 26 and Taishan 269) with different UV-B tolerance as test materials, this paper compared their morphological indices, biomass, and physiological indices under effects of different dose UV-B radiation. For the two test varieties, high dose UV-B radiation decreased their plant height, leaf color value, tiller number, fresh weight, F_v/F_m, and photosynthesis rate, but increased their leaf MDA and flavonoid contents and relative electric conductivity. In these aspects, wheat variety Taishan 269 showed more apparent variations than Keyi 26, suggesting that the former was more sensitive to enhanced UV-B radiation. Low dose UV-B radiation promoted the plant height, leaf color value, tiller number, fresh mass, and especially, flavonoid content of test varieties, but had less effects on the F_v/F_m, leaf MDA content, and leaf relative electric conductivity.

Key words: Dry-hot volley, Artificial vegetation, Soil water environment