Journal
SOUTH AFRICAN JOURNAL OF BOTANY
Volume 85, Issue -, Pages 79-86Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.sajb.2012.11.006
Keywords
UVB; ABA; Mutant sad2-1; Antioxidant enzymes
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Funding
- NSFC (National Natural Science Research Foundation of China) [30771156, 30800585, 31170246]
- Doctoral Foundation of Shandong Province [BS2011SW048]
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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. (C) 2012 SAAB. Published by Elsevier B.V. All rights reserved.
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