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Two Non-Necrotic Disease Resistance Types Distinctly Affect the Expression of Key Pathogenic Determinants of <i>Xanthomonas euvesicatoria</i> in Pepper
oleh: Zoltán Bozsó, Dániel Krüzselyi, Ágnes Szatmári, Gábor Csilléry, János Szarka, Péter G. Ott
Format: | Article |
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Diterbitkan: | MDPI AG 2022-12-01 |
Deskripsi
Pepper (<i>Capsicum annuum</i> L.) carrying the <i>gds</i> (corresponding to <i>bs5</i>) gene can prevent the development of bacterial leaf spot disease without HR. However, little is known regarding the development of the resistance mechanism encoded by <i>gds</i>, especially its influence on the bacterium. Here, the effect of <i>gds</i> was compared with pattern-triggered immunity (PTI), another form of asymptomatic resistance, to reveal the interactions and differences between these two defense mechanisms. The level of resistance was examined by its effect on the bacterial growth and <i>in planta</i> expression of the stress and pathogenicity genes of <i>Xanthomonas euvesicatoria</i>. PTI, which was activated with a <i>Pseudomonas syringae hrcC</i> mutant pretreatment, inhibited the growth of <i>Xanthomonas euvesicatoria</i> to a greater extent than <i>gds</i>, and the effect was additive when PTI was activated in <i>gds</i> plants. The stronger influence of PTI was further supported by the expression pattern of the <i>dpsA</i> bacterial stress gene, which reached its highest expression level in PTI-induced plants. PTI inhibited the <i>hrp/hrc</i> expression, but unexpectedly, in <i>gds</i> plant leaves, the <i>hrp/hrc</i> genes were generally expressed at a higher level than in the susceptible one. These results imply that different mechanisms underlie the <i>gds</i> and PTI to perform the symptomless defense reaction.