Hydrogen peroxide as a signalling molecule in plants and its crosstalk with other plant growth regulators under heavy metal stress. (August 2020)

• Record Type: Journal Article
• Authors: Nazir, Faroza; Fariduddin, Qazi; Khan, Tanveer Alam
• Is Part Of: Chemosphere. Volume 252(2020)
• Publication Date: 2020-08
• Subjects: Hydrogen peroxide -- Heavy metals -- Plant growth regulators -- Protein kinases -- Transcription factors -- Tolerance; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126486
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Hydrogen peroxide (H2 O2 ) acts as a significant regulatory component interrelated with signal transduction in plants. The positive role of H2 O2 in plants subjected to myriad of abiotic factors has led us to comprehend that it is not only a free radical, generated as a product of oxidative stress, but also helpful in the maintenance of cellular homeostasis in crop plants. Studies over the last two centuries has indicated that H2 O2 is a key molecule which regulate photosynthesis, stomatal movement, pollen growth, fruit and flower development and leaf senescence. Exogenously-sourced H2 O2 at nanomolar levels functions as a signalling molecule, facilitates seed germination, chlorophyll content, stomatal opening, and delays senescence, while at elevated levels, it triggers oxidative burst to organic molecules, which could lead to cell death. Furthermore, H2 O2 is also known to interplay synergistically or antagonistically with other plant growth regulators such as auxins, gibberellins, cytokinins, abscisic acid, jasmonic acid, ethylene and salicylic acid, nitric oxide and Ca 2+ (as signalling molecules), and brassinosteroids (steroidal PGRs) under myriad of environmental stresses and thus, mediate plant growth and development and reactions to abiotic factors. The purpose of this review is to specify accessible knowledge on the role and dynamic mechanisms of H2 O2 in mediating growth responses and plant resilience to HM stresses, and its crosstalk with other significant PGRs in controlling various processes. More recently, signal transduction by mitogen activated protein kinases and other transcription factors which attenuate HM stresses in plants have also been dissected. Highlights: Hydrogen peroxide acts as a significant signalling and regulatory component interrelated with signal transduction in plants. H2 O2 at nanomolar levels facilitates seed germination, chlorophyll content, stomatal opening, flowering and delays senescence. At elevated levels, H2 O2 triggers oxidative burst to organic molecules, which lead to cell death. H2 O2 is also known to interplay synergistically or antagonistically with other plant growth regulators.