Climate change variables induced soft rot causing plant pathogen to produce new quorum sensing (cell to cell communication) signal for enhanced pathogenesis
Keywords:
Pathogenesis, Quorum sensing, Pectobacterium carotovorum sub sp. carotovorumAbstract
Although unicellular, bacteria are highly interactive, behave like a social organism and employ a range of cell-to-cell communication [Quorum Sensing (QS)] for behaving collectively. Climate change variables found to have direct influence on pathogenic capacity of Pectobacterium carotovorum sub sp. carotovorum (Pcc) hence on QS. Under elevated CO2 and temperature, Pcc produced three different quorum sensing signal molecules and chemically confirmed as C6-OHHL,C6-HHL and a new signal (earlier not reported in Pcc) C10-3-Decanoyl homoserine lactone (C10-dHSL)(m/z:268.2). Production and secretion of C10 signal molecule with un-saturation in C2 position is first report from Pcc and this signal played synergistic roles on C6-OHHL mediated virulence.Under controlled environmental chamber (Phytotron), highest disease severity (73.18%) was observed in elevated CO2 (600 ppm) and temperature (28oC) in tomato. This enhanced virulence was confirmed as stimulatory effect of C10-dHSL to the function of
C6-OHHL.
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