Effects of ABA and NaCl on physiological responses in selected bryophyte species

Abstract

The effects of NaCl and ABA on selected bryophyte species were studied. Two phylogenetically unrelated halophyte mosses, namely, Entosthodon hungaricus and Hennediella heimii, in addition of one model non-halophyte moss, Physcomitrella patens, were selected to compare the variability in certain biochemical and physiological parameters under salt-stress alone and salt-stress upon ABA pretreatment. The results showed different patterns of ABA effects in all three studied species, as well as no common response to salt stress. In general, all tested species reacted to exogenous ABA, which surely contributed to changes observed in morphological development under salt stress, and to salt-tolerance mechanism function. Physcomitrella patens proved to be a salt tolerant species. Although it is not ecologically classified as a halophyte, these results highlighted that various stress-resistance pathways are supported by similar reactions to different stresses. Significant differences in stress tolerance were documented between the two bryo-halophytes tested by comparing biochemical and physiological parameters. Our findings suggested that different salt stress-tolerance strategies characterize these two species, both enhanced by exogenous ABA.

Peer Review #1 of "Acclimation of liverwort Marchantia polymorpha to physiological drought reveals important roles of antioxidant enzymes, proline and abscisic acid in land plant adaptation to osmotic stress (v0.1)"

“…Previous reports also demonstrated that ABA essentially triggered the antioxidant enzyme activities in angiosperms wheat and maize in response to drought stress (Wei et al, 2015;Yao et al, 2019). A lower level of ABA contributed to the activation of enzymatic antioxidant system in liverwort M. polymorpha, moss P. patens, A. undulatum, Entosthodon hungaricus and Hennediella heimii (Vujicic et al, 2017;Ćosić et al, 2020b). The ABAmediated enhancement of antioxidant enzyme activities was also reported in aquatic seaweed (Guajardo, Correa & Contreras-Porcia, 2016), indicating that the mechanisms was initiated earlier than the terrestrial plant.…”

DICER‐LIKE1a autoregulation based on intronic microRNA processing is required for stress adaptation in Physcomitrium patens

“…Even though it is not clear when the ABA signaling transduction pathway emerged, the number of core components as well as distinct specialized functions have increased to adapt to the terrestrial habitat during land plant evolution (Furst-Jansen et al, 2020;Komatsu et al, 2020). ABA, a key mediator of the abiotic stress response, is responsible for regulating biochemical, metabolic and physiological mechanisms in response to environmental cues, including salt stress ( Cosi c et al, 2020). Despite the multigenic nature of salinity tolerance, we report here that the miR1047-based feedback control of the PpDCL1a transcript is one of the key components of salt stress adaptation in P. patens.…”

Acclimation of liverwort Marchantia polymorpha to physiological drought reveals important roles of antioxidant enzymes, proline and abscisic acid in land plant adaptation to osmotic stress

“…Previous reports also demonstrated that ABA essentially triggered the antioxidant enzyme activities in angiosperms wheat and maize in response to drought stress ( Wei et al, 2015 ; Yao et al, 2019 ). A lower level of ABA contributed to the activation of enzymatic antioxidant system in liverwort M. polymorpha and mosses P. patens, A. undulatum, Entosthodon hungaricus , and Hennediella heimii ( Vujicic et al, 2017 ; Ćosić et al, 2020b ). The ABA-mediated enhancement of antioxidant enzyme activities was also reported in aquatic seaweed ( Guajardo, Correa & Contreras-Porcia, 2016 ), indicating that the mechanisms was initiated earlier than the terrestrial plant.…”