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The Role of Plasma Membrane Proteins in Tolerance of Dehydration in the Plant Cell
Published in Hasanuzzaman Mirza, Nahar Kamrun, Fujita Masayuki, Oku Hirosuke, Tofazzal M. Islam, Approaches for Enhancing Abiotic Stress Tolerance in Plants, 2019
Pragya Barua, Dipak Gayen, Nilesh Vikram Land, Subhra Chakraborty, Niranjan Chakraborty
PM H+ATPases couple ATP hydrolysis with proton transport across the membrane and helps create a potential difference. One of their basic functions in plants is involvement in polar auxin transport and signaling. The several isoforms of PM H+ATPases are encoded by a multigene family. Arabidopsis hosts 11 such isoforms, with different members showing ubiquitous as well as tissue or stage-specific expression (Zhang et al., 2017). H+ATPases are also reported to be instrumental in brassinosteroid-mediated signaling under cadmium stress (Jakubowska and Janicka, 2017). Their role in heavy-metal-induced abiotic stress has been highlighted in several studies (Table 18.1).
The aluminum tolerance and detoxification mechanisms in plants; recent advances and prospects
Published in Critical Reviews in Environmental Science and Technology, 2022
Lei Yan, Muhammad Riaz, Jiayou Liu, Min Yu, Jiang Cuncang
Concerning the physiological role in plants, as mentioned above, the release of inorganic phosphorus from roots also increase the pH value of root surface, which has been confirmed in Al-tolerant wheat varieties (Pellet et al., 1997). Besides, plants can increase root surface pH by absorbing H+. In the root tip of Al-tolerant Arabidopsis mutant, the flow of H+ increased twice under Al stress, and its resistance to Al toxicity was significantly reduced when the mutant was placed in pH buffer (Ma, 2007a). The pH had a discrepancy between different root segments, the pH of the meristematic zone and transitional zone were generally higher than that of the elongation zone and mature zone (Liu et al., 2018). Aluminum stress can induce extracellular H+ to enter the cytoplasm, increase the pH around the root cap and reduce the solubility of Al3+, thus reduce the activity of Al3+ around the root tip and improve its tolerance to Al (Degenhardt et al., 1998; Kochian et al., 2015). Polar auxin transport and the downstream regulation of the plasma membrane H+-ATPase could elevate root surface pH (root surface alkalization), which is very crucial to reduce Al accumulation in the Al-targeted apical root zone (Li et al., 2018).