Salicylic acid-induced accumulation of biochemical components associated with resistance against Xanthomonas oryzae pv. oryzae in rice |
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| Authors: | Toan Le Thanh Kanjana Thumanu Sopone Wongkaew Nantakorn Boonkerd Neung Teaumroong Piyaporn Phansak |
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| Affiliation: | 1. School of Crop Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand;2. Crop Protection Department, College of Agriculture and Applied Biology, Can Tho University, Can Tho City, Viet Nam;3. Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand;4. School of Biotechnology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand;5. Division of Biology, Faculty of Science, Nakhon Phanom University, Muang, Nakhon Phanom, Thailand |
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| Abstract: | Seed treatment and foliar sprays of salicylic acid (SA) provided protection in rice against bacterial leaf blight (BLB) caused by bacterial Xanthomonas oryzae pv. oryzae (Xoo). Treatment of rice with exogenous SA reduced disease severity by more than 38%. Superoxide anion production and hypersensitive response increased approximately 28% and 110% at 6 and 48?h after Xoo inoculation, respectively, for plants treated with SA. Moreover, the Xoo in treated rice plants grew more slowly, resulting in a population that was half of that observed in the control. Fourier transform infrared spectroscopy analysis revealed that the higher ratios of 1233/1517, 1467/1517, and 1735/1517?cm?1 observed in treated rice suggested alteration of monomer composition of lignin and pectin in the rice cell wall. Exogenous SA-treated rice had more amide I β-sheet structure and lipids as shown by the peaks at 1629, 2851, and 1735?cm?1. These biochemical changes of rice treated with SA and inoculated with Xoo were related to primed resistance of the rice plants to BLB disease. |
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| Keywords: | Bacterial leaf blight salicylic acid rice defence reactions biochemical change FTIR |
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