Abstract
In tomato, the stolbur disease caused by ‘Candidatus Phytoplasma solani’ alters developmental processes resulting in malformations of both vegetative and reproductive organs, two stolbur phytoplasma strains PO and C induce mutually distinct symptoms. The aim of the present study was to determine the effect of stolbur phytoplasma-infection on the Salicylic (SA) and Jasmonic (JA) acids hormone signalling pathways and to assess whether pre-activation of these defence pathways could protect tomato against the stolbur disease development. Expression of SA- and JA-dependent marker genes was studied in tomato by qRT-PCR. Results indicated that the SA-mediated defence response was activated by the stolbur phytoplasma strains PO and C in contrast to the JA-dependent defence pathway which was repressed by strain PO but activated by strain C. The two stolbur strains, PO and C, generated different responses, suggesting that the two strains might have distinct virulence factors, in agreement with the fact that they induce distinctive symptoms. In stolbur PO-infected tomato, pre-activation of the JA-dependent defence pathway by methyl jasmonate (MeJA) before infection had no effect on the disease development whereas pre-activation of the SA-dependent defence pathway by treatment with benzothiadiazole (BTH) prior to graft-inoculation of the phytoplasma resulted in a minor delay in phytoplasma multiplication and symptom production. As grafting implicates a high inoculum as compared to insect inoculation, it would be of interest to test BTH treatment in natural conditions.
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Acknowledgments
Jam Nazeer Ahmad was received a grant from Higher Education Commission of Pakistan (HEC) through SFERE in France. We thank Kaëlig Guionneaud and Denis Lacaze for growing and grafting plants.
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Supplementary table S1
primers used for transcriptional expression study of 14 genes involved in defense pathways in 3 mm flower buds and leaves of stolbur C and PO phytoplasma-infected tomatoes through real time RT-PCR (except PR4 by semi-quantitative RT-PCR). PAL: Phenylalanine ammonialyase, ICS: Isochorismate synthase, CHS2: Chalcone synthase 2, a-PRX: Acidic pathogenesis-related proteinX, b-PRX: Basic pathogenesis-related proteinX, PRX: Pathogenesis-related proteinX, LOXD: Lipoxygenase, PIN2: Proteinase inhibitor 2, PTI4: Transcription factor Pti4, TSR: stress-responsive factor TSRF1. (DOCX 25 kb)
Supplementary table S2
Transcriptional expression of 14 genes involved in defense pathways in 3 mm flower buds and leaves of stolbur PO and C phytoplasma-infected tomatoes through real time RT-PCR. PAL: Phenylalanine ammonialyase, ICS: Isochorismate synthase, CHS2: Chalcone synthase 2, a-PRX: Acidic pathogenesis-related proteinX, b-PRX: Basic pathogenesis-related proteinX, PRX: Pathogenesis-related proteinX, LoxD: Lipoxygenase, PIN2: Proteinase inhibitor 2, PTI4: Transcription factor Pti4, TSR: stress-responsive factor TSRF1. Values represent relative gene expression (RGE). RGE <1 means gene repression. (DOCX 21 kb)
Supplementary Fig. S1
Transcriptional expression analysis of acidic PR1 and proteinase inhibitor 2 (PIN2) 14 days or 21 days after infection in tomato. Plants were healthy (H) or stolbur infected (S), treated with ethanol (etOH) or methyl jasmonate (MeJA). Results are means of 3 replicates (*P < 0.05; **P < 0.005; ***P < 0.001) (DOCX 75 kb)
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Ahmad, J.N., Renaudin, J. & Eveillard, S. Expression of defence genes in stolbur phytoplasma infected tomatoes, and effect of defence stimulators on disease development. Eur J Plant Pathol 139, 39–51 (2014). https://doi.org/10.1007/s10658-013-0361-x
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DOI: https://doi.org/10.1007/s10658-013-0361-x