Current Science

Soumen Bhattacharjee ¹

Affiliations
1 Plant Physiology and Biochemistry Research Laboratory, Centre for Advanced Study, Department of Botany, University of Burdwan, Burdwan 713 104, IN

Abstract

Membranes are the most vital structure for all organisms which not only control molecular trafficking but also perceive environmental cues and transduce it in response. Membrane lipid peroxidation, which is normally associated with natural course of ageing, senescence and environmental stresses, is mechanistically important as it is one of the very few examples of carbon-centered radical production in cell. Chemically, it involves the formation and propagation of lipid radicals, the uptake of molecular oxygen and arrangement of double bonds in the unsaturated lipids and eventually their destruction, with subsequent production of a variety of breakdown products, including alcohol, ketones, alkanes, aldehydes and ethers. The process is considered as the main event involved in oxidative damage to cell, which may eventually cause cell death. A significant proportion of oxidized lipids are electrophilic in nature. Recent studies suggest that reactive lipid species formed through lipid peroxidation can benefit cells in a number of ways. There are strong evidences in support of the view that reactive lipid species-mediated signalling participates in several physiological pathways including apoptosis, induction of antioxidative defence, membrane repair, proteosomal pathway, etc. The activation of cell signalling pathways by reactive lipid species is hierarchical and largely depends on intrinsic chemical reactivity of electrophiles, thiol-containing signalling domains and the subsequent signalling cascades. An effort has been made to provide an update on membrane lipid peroxidation while addressing the conflicting roles of membrane lipid peroxidation in deteriorative oxidative damage and adaptive cell signalling.

Keywords

Adaptive Response, Cell Signalling, Membrane Lipid Peroxidation, Oxidative Damage, Reactive Lipid Species.

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Durga Kora ¹, Soumen Bhattacharjee ¹

Affiliations
1 Plant Physiology and Biochemistry Research Laboratory, Centre For Advanced Study, Department of Botany, University of Burdwan, Burdwan 713 104, IN

Abstract

This article highlights the physiological and molecular language that exploits redox pathways to modulate hormonal function and, transcriptional regulation of gene expression associated with adventitious ischolar_main formation (ARF) in plants. The role of plant growth regulators that exploit the redox cue either by activating the NADPH-oxidase or modulating antioxidant-coupled redox signalling during ARF is also elaborated. We also elaborate upon various transcriptomic studies on the role of reactive oxygen species in upregulation of various proteins and transcription factors involved in cell cycle and cell division, hormone signalling, amino acid synthesis, protein processing, transport and cell-wall modification.

Keywords

Adventitious Root Formation, Phytohormones, Reactive Oxygen Species, Redox Cue, Stress Signalling.

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