New Aspect of H₂O₂Signaling

Abstract

Plant defense is based on a complex response triggered by unfavorable external impacts. The redox state of the cells and its temporal alteration, the oxidative burst, is an important regulatory element of this defense response. Data collected during the last years have caused us to change the previous, strongly simplified theory on signaling which had been based on a speculative, rather sequential mechanism. In the framework of signal transduction, H(2)O(2) signaling pathway(s) is/are only a special part of signal transduction but interacting with other pathways it/they influence the whole transducting system in several points. Our results show that in complexity and in basic regulatory mechanisms (transients, oscillation, tuning, signaling pattern) H(2)O(2) signaling is comparable with other pathways, of which we have more detailed cognition, and our present knowledge makes developing a new theory on this aspect necessary.

A Novel Protein Elicitor PeBL2, from Brevibacillus laterosporus A60, Induces Systemic Resistance against Botrytis cinerea in Tobacco Plant

“…In order to examine recombinant PeBL2-activated HR biochemical responses, the accumulation of ROS generated by the plasma membrane-localized NADPH oxidase complex was analyzed ( Bóka and Orbán, 2007 ; Rahantaniaina et al, 2017 ) and levels of H 2 O 2 and superoxide anion (O − 2 ) production were assayed using DAB. Significant brown DAB-stained precipitates were easily observed in the recombinant PeBL2-treated areas ( Fig.…”

A Novel Protein Elicitor (PeBA1) from Bacillus amyloliquefaciens NC6 Induces Systemic Resistance in Tobacco

“…ROS burst is one of the earliest significant events before the HR 41 and has a crucial role in plant systemic resistance 42 . To further examine the recombinant PeBA1-activated HR biochemical responses, we analysed the accumulation of ROS generated by the plasma membrane-localized NADPH oxidase complex 43 .…”

PeBL1, a Novel Protein Elicitor from Brevibacillus laterosporus Strain A60, Activates Defense Responses and Systemic Resistance in Nicotiana benthamiana

“…In comparison with a known elicitor, Flg22, used as a positive control, PeBL1-treated and Flg22-treated tobacco suspension cells showed similar ROS production patterns, indicating that PeBL1 performs similarly to this well-known elicitor. ROS act as signaling molecules and interact with various molecules, including calcium ions, NO (nitric oxide), lipids, and mitogen-activated protein (MAP) kinase, which are general regulatory elements (59,60). These signaling molecules may be involved in physiological phenomena and can regulate several processes in interconnected branch pathways and defense signaling pathways (61,62).…”