Abstract
CAMTA3, a Ca2+-regulated transcription factor, is a repressor of plant immune responses. A truncated version of CAMTA3; CAMTA3334 called N-terminal repression module (NRM), and its extended version (CAMTA447), which include the DNA binding domain, were previously reported to complement the camta3/2 mutant phenotype. Here, we generated a series of CAMTA3 truncated versions [the N-terminus (aa 1-517), C-terminus (aa 517-1032), R1 (aa 1-173), R2 (aa 174-345), R3 (aa 346–517), R4 (aa 517-689), R5 (aa 690-861) and R6 (aa 862-1032)], expressed in camta3 mutant and analyzed the phenotypes of the transgenic lines. Interestingly, unlike CAMTA447, extending the N-terminal region to 517 aa did not complement the camta3 phenotype, suggesting that the amino acid region from 448-517 (70 aa), which includes a part of the TIG domain suppresses the NRM activity. The C-terminus and other truncated versions (R1–R6) also failed to complement the camta3 mutant. Expressing the full length or NRM of CAMTA3 in camta3 plants suppressed the activation of immune-responsive genes and increased the expression of cold-induced genes. In contrast, the transgenic lines expressing the N- or C-terminus or R1–R6 of CAMTA3 showed expression patterns like those of the camta3 with enhanced expression of the defense genes and suppressed expression of the cold response genes. Furthermore, like camta3, the transgenic lines expressing the N- or C-terminus, or R1–R6 of CAMTA3 exhibited higher levels of H2O2 and increased resistance to a Pst DC3000 as compared to WT, NRM, or FL-CAMTA3 transgenic plants. Our studies identified a novel regulatory region in CAMTA3 that suppresses the NRM activity.
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Acknowledgements
This research was supported by the Agriculture and Food Research Initiative competitive grant (2019-67013-29239) of the USDA NIFA and the NSF (MCB # 5333470) to A.S.N.R; A.A.E.A. was supported by the Egyptian Cultural and Educational Bureau.
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Funding was provided by the Directorate for Biological Sciences (NSF) and the NIFA (USDA).
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A.S.N.R. conceived the project. A.A.E.A. made gene constructs, generated lines expressing different versions of CAMTA3, and performed transcript quantification of marker genes. K.V.S.K.P. performed immunoblots, disease resistance assays, and in situ staining for H2O2. All authors were involved in data analysis and writing the manuscript.
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Supplementary Table 1
Primer sequences of all the primers used in the current investigation (DOCX 46 kb)
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Abdel-Hameed, A.A.E., Prasad, K.V.S.K. & Reddy, A.S.N. The amino acid region from 448-517 of CAMTA3 transcription factor containing a part of the TIG domain represses the N-terminal repression module function. Physiol Mol Biol Plants 29, 1813–1824 (2023). https://doi.org/10.1007/s12298-023-01401-w
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DOI: https://doi.org/10.1007/s12298-023-01401-w