Abstract
ABSTRACTSeed 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.
Highlights
Rice (Oryza sativa L.) is one of the most important crops in the world
The results indicate that the treatments with 1 mM salicylic acid (SA) significantly reduced the severity of bacterial leaf blight (BLB) in the rice foliage at 7 and 14 days after inoculation (DAI) compared to the non-treated control, confirming that induction of systemic resistance had occurred
We investigated whether a classification procedure could provide more information about the biochemical change of rice leaves treated with exogenous SA and challenge inoculated with Xanthomonas oryzae pv. oryzae (Xoo)
Summary
Rice (Oryza sativa L.) is one of the most important crops in the world. Asia has the largest growing area, with top producing countries including China, India, Thailand, and Vietnam (Xu et al 2013). Previous studies have shown that resistance can be induced by priming plants with chemical inducers such as acibenzolarS-methyl, benzo-1,2,3-thiadiazole-7-carbothionic acid Smethyl ester (BTH), L-ascorbic acid, N-cyanomethyl-2-chloroisonicotinamide, oxalic acid, probenazole, SA, and sodium saccharin dihydrate (Ganesan & Thomas 2001; Nakashita et al 2002; Tokunaga & Esaka, 2007; Kumar et al 2011; Nahar et al 2011; Li & Zhang 2012; Anwar et al 2013; Takatsuji 2014). The SA-dependent pathway is associated with systemic acquired resistance (SAR) activated upon infection of the rice plant pathogens (Sticher et al 1997)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
