Hormone dependent survival mechanisms of plants during post-waterlogging stress

Abstract

Waterlogging stress has two phases like waterlogging phase and post-waterlogging phase where both are injurious to plants. Susceptible plants normally die at post-waterlogging phase due to damaged root system, sudden rexoygenation, dehydration and photoinhibition of the desubmerged tissues. Formation of reactive oxygen species (ROS) is the main result of reoxygenation stress that can cause oxidative damage of the functional tissues responsible for normal physiological activities. There are almost all types of hormones responsible to recover plants from these destructive phenomenons. Among these hormones ethylene and abscisic acid (ABA) are the main regulators to overcome the reoxygenation and drought like stresses in plants at post-waterlogging condition. The balanced crosstalk among the hormones is highly important for the survival of plants at these stresses. So this paper is completely a precise summary of hormonal homeostasis of post-waterlogged plants through physiological, biochemical and signaling pathways. ARTICLE HISTORY

Leaf nutrient content and transcriptomic analyses of endive (Cichorium endivia) stressed by downpour-induced waterlog reveal a gene network regulating kestose and inulin contents

“…As lettuce and endive share common pathogens, the transcriptomic analyses of endive orthologs to lettuce responding to infections (Table S 7 ) were addressed and the comparison between our data with those of transcriptome variations in lettuce-pathogen interactions did not bring out the response of genes 3 , 42 or GO terms typically associated to disease 43 . Hence, the data reinforced that stress sources other than waterlog were minimal and waterlog was likely to be the prevailing cause of the “omic” differences, and consistently, many enriched GO terms of endive recur in leaf transcriptional responses of waterlogged plants 8 , 44 . Indeed, DEG-enriched terms about ethylene, jasmonate, and ABA typically characterize waterlog-induced hormonal responses 8 .…”

“…Overall, the waterlog impact on plant metabolism varies with severity, timing and duration of stress and with genotype tolerance 5 . Communication from anoxic root to shoot occurs via xylem 6 , throughout root signals such as tricarboxylic acids (TCA) 7 and hormones 8 . Leaf responses include stomatal closure and non-stomatal metabolic alterations (e.g.…”

The Contribution of Plant Dioxygenases to Hypoxia Signaling

“…Strigolactones (SLs) are a group of molecules involved in the control of shoot branching, adventitious root development, establishment of symbiotic mycorrhiza and, recently, have been associated to root adaptation to abiotic stress conditions including waterlogging (Bashar, 2018). SLs biosynthetic pathways require the action of two CCD enzymes: CCD7 and CDD8 (Booker et al, 2004;Auldridge et al, 2006).…”

Phytohormone-Mediated Stomatal Response, Escape and Quiescence Strategies in Plants under Flooding Stress

“…Oxidation of putrescine by CuAO produces H 2 O 2 , follows stomatal closure in V. faba [82] ( Figure 4). ABA is also responsible for stomatal closing in plants as a survival mechanism under post-waterlogging stress [84].…”

“…Proposed model for hormone mediated stomatal closure under waterlogging and/or post-waterlogging stress conditions. Modified figure[84]. Ethylene and/or ABA are directly or indirectly enhance H 2 O 2 production under waterlogging and/or post-waterlogging stress conditions.…”