Responses to Solar UV-B Exclusion and Drought Stress in Two Cultivars of Chestnut Rose with Different Leaf Thickness

Plants adopt a series of strategies to tolerate solar UV-B radiation (with the side effects growth reduction), but positive have not been yet clarified. In this study, two cultivars with different leaf thickness for Chestnut rose (Rosa roxburghii Tratt), pioneering species ecological restoration in Karst region Southwest China, were employed investigate its responses ultraviolet-B (UV-B) exclusion, moderate drought, and their combination an outdoor experiment. Thin-leaf (Gui 2) opportunistic strategy, growing better than Gui 7 under exclusion combined well-watered conditions. To avoid penetration wavelengths into underlying tissues, 2 exhibited higher enhancements thickness, palisade/spongy tissue ratio, antioxidant such as concentration flavonols compounds catalyse activity exposure. Moreover, ambient alleviated adverse impact caused by drought both cultivars, improving total biomass reducing membrane penetration. This alleviation may be related potential explanations. First, primes chestnut plants increased antioxidative capacity against stress, shown enzyme non-enzyme antioxidants (in particular, flavonol ratio [(quercetin+myricetin)/kaempferol]). Second, nutrition insufficiency, endows complementary on balance. Overall, helps stress that occurs frequently modulating