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. 2020 Apr 14;10:6313. doi: 10.1038/s41598-020-63059-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Salicylic acid is involved in the disease resistance of IRBB5 to Xoo strain PXO86. (a) Resistance of IRBB5, IR24, B5xa5Ri, 24NG and B5NG plants at the flourishing tillering stage. NahG-dependent lesion formation is shown in the leaves of B5NG plants. The phenotype survey is carried out at 14 dai. The scale bar is 2 cm. (b) Lesion lengths on the leaves of rice plants at 14 dai. Values are the mean ± SD of three independent biological replicates. Letters denote significant differences based on analyses of plants treated with SA (+SA) and H₂O (−SA) using the Tukey significance difference test (p < 0.05). (c) Bacterial populations of PXO86 in rice plants. Number of bacteria in 1-cm leaf sections from the cut sites were measured at 1, 4, 8 and 12 dai. Bars are means ± standard error. These plants were pretreated with 2 mM SA or H₂O for one day and then inoculated with PXO86. B5NG and 24NG are the T₁ transgenic plants overexpressing the bacterial nahG gene in IRBB5 and IR24 respectively; B5xa5Ri is the xa5 RNAi plant in IRBB5 background; IRBB5V and IR24V are the transgenic plants with pCAMBIA1300 vector in IRBB5 and IR24 respectively.