Abscisic acid is involved in the response of Arabidopsis mutant sad2-1 to ultraviolet-B radiation by enhancing antioxidant enzymes

作者：M. Chen, Wenqi Zhang, Zhiwei Lv, Shiyong Zhang, Jun Hidema, Fumei Shi, L.L. Liu · 发表于：South African Journal of Botany · 年份：2013 · DOI：10.1016/j.sajb.2012.11.006 · 被引用次数：36 · 研究领域：Light effects on plants、Plant Stress Responses and Tolerance、Photosynthetic Processes and Mechanisms

In this study, we examined the physiological mechanisms in the responses of Arabidopsis mutant sensitive to ABA and drought 2–1 (sad2-1) to ultraviolet-B radiation (UVB) treatments. The effects of enhanced UVB radiation on plant growth, concentration of UV-absorbing compounds, photosynthesis, endogenous ABA and antioxidant system were investigated in two types of Arabidopsis thaliana — the mutant sad2-1 and the wild type (WT, C24). Results indicated that, under UVB radiation, mutant sad2-1 showed a higher resistance than C24 through accumulating more UV absorption materials, maintaining bio-membrane balance and photosynthesis efficiency, enhancing endogenous ABA content and activating ROS scavenging enzymes. It can be postulated that ABA might participate in a complex signal crosstalk in increasing the tolerance of UVB.