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- Title
Aliphatic suberin confers salt tolerance to Arabidopsis by limiting Na+ influx, K+ efflux and water backflow.
- Authors
Wang, Pei; Wang, Chun-Mei; Gao, Li; Cui, Yan-Nong; Yang, Hai-Li; de Silva, Nayana D. G.; Ma, Qing; Bao, Ai-Ke; Flowers, Timothy J.; Rowland, Owen; Wang, Suo-Min
- Abstract
Background and aims: Uncontrolled uptake of Na+ is the reason that many species are sensitive to salinity. Suberin is a protective barrier found in the walls of root endodermal cells that appears to be important for salt tolerance, yet its specific protective mechanism has not been fully elucidated. Methods: Here we investigated the role of aliphatic suberin in protecting plants against salt stress by using a mutant of Arabidopsis, cyp86a1, which exhibits a significant reduction of root aliphatic suberin. Results: We found that NaCl significantly increased suberization in roots of hydroponic-grown wild-type plants, but not in cyp86a1. Cyp86a1 exhibited a salt-sensitive phenotype. Compared with wild-type, Na+ accumulation in shoots was higher in cyp86a1. We provide evidence that increased Na+ uptake was via the root transcellular pathway. Furthermore, cyp86a1 accumulated less K+ in shoots than wild-type under NaCl stress, which was a consequence of increased K+ efflux from the root vasculature. Additionally, we provide evidence that aliphatic suberin reduces inflow of water across the root endodermis under non-stress conditions but reduces the backflow of water to the medium under salt stress. Conclusions: Finally, we propose a model for the role of aliphatic suberin in restricting Na+ influx, K+ efflux and water backflow in plants under saline conditions.
- Subjects
TRANSCYTOSIS; ARABIDOPSIS; SALT; PLANT-water relationships; SALINITY
- Publication
Plant & Soil, 2020, Vol 448, Issue 1/2, p603
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-020-04464-w