Abscisic acid improves drought tolerance of triploid bermudagrass and involves H2O2- and NO-induced antioxidant enzyme activities |
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| Authors: | Shaoyun Lu Wei Su Haihang Li Zhenfei Guo |
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| Affiliation: | 1. Biotechnology Laboratory for Forages and Turfgrass, College of Life Science, South China Agricultural University, Wu Shan Street, Guangzhou 510642, China;2. Test Center, South China Agricultural University, Guangzhou 510642, China;3. College of Life Sciences, South China Normal University, Guangzhou 510631, China;1. Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;1. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China;2. Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China;1. Istituto di Fisica Applicata “Nello Carrara” CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy;2. Department of Agriculture, Food and Environment, University of Pisa, via del Borghetto n. 80, 56124 Pisa, Italy;1. Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture and Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, Hubei 430074, China;2. University of Chinese Academy of Sciences,19 Yuquan Road, Beijing 100049, China;1. USDA – Agricultural Research Service, 3218 Williams Hall, NCSU Campus Box 7619, Raleigh, NC 27695, United States;2. USDA – Agricultural Research Service, 1100 S. Limestone, Lexington, KY 40546, United States;3. USDA – Agricultural Research Service, 1420 Experiment Station Road, Watkinsville, GA 30677, United States |
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| Abstract: | Drought is a major limiting factor for turfgrass growth. Protection of triploid bermudagrass against drought stress by abscisic acid (ABA) and its association with hydrogen peroxide (H2O2) and nitric oxide (NO) were investigated. ABA treatment increased relative water content, decreased ion leakage and the percentage of dead plants significantly under drought stress. Superoxide dismutase (SOD) and catalase (CAT) activities increased in both ABA-treated and control plants, but more in ABA-treated plants, under drought stress. Malondialdehyde, an indicator of plant lipid peroxidation, was lower in ABA-treated plants than in control plants, indicating that ABA alleviated drought-induced oxidative injury. ABA treatment increased H2O2 and NO contents. ABA-induced SOD and CAT activities could be blocked by scavengers of H2O2 and NO, and inhibitors of H2O2 and NO generation. The results indicated that H2O2 and NO were essential for ABA-induced SOD and CAT activities. Both H2O2 and NO could induce SOD and CAT activities individually. SOD and CAT induced by H2O2 could be blocked by scavenger of NO and inhibitors of NO generation, while SOD and CAT induced by NO could not be blocked by scavenger of H2O2 and inhibitor of H2O2. The results revealed that ABA-induced SOD and CAT activities were mediated sequentially by H2O2 and NO, and NO acted downstream of H2O2. |
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