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Tissue tolerance mechanisms conferring salinity tolerance in a halophytic perennial species Nitraria sibirica Pall.

Authors
  • Tang, Xiaoqian1
  • Zhang, Huilong1
  • Shabala, Sergey2, 3
  • Li, Huanyong4
  • Yang, Xiuyan1
  • Zhang, Huaxin1
  • 1 Research Center of Saline and Alkali Land of National Forestry and Grassland Administration, Chinese Academy of Forestry, Beijing 10091, China. , (China)
  • 2 Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania 7001, Australia. , (Australia)
  • 3 International Research Centre for Environmental Membrane Biology, Foshan University, Foshan Guangdong 528000, China. , (China)
  • 4 Tianjin Academy of Agricultural Sciences, Tianjin 300384, China. , (China)
Type
Published Article
Journal
Tree Physiology
Publisher
Oxford University Press
Publication Date
Jul 05, 2021
Volume
41
Issue
7
Pages
1264–1277
Identifiers
DOI: 10.1093/treephys/tpaa174
PMID: 33367891
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Plant salt tolerance relies on a coordinated functioning of different tissues and organs. Salinity tissue tolerance is one of the key traits that confer plant adaptation to saline environment. This trait implies maintenance low cytosolic Na+/K+ ratio in metabolically active cellular compartments. In this study, we used Nitraria sibirica Pall., a perennial woody halophyte species, to understand the mechanistic basis of its salinity tissue tolerance. The results showed that the growth of seedlings was stimulated by 100-200 mM NaCl treatment. The ions distribution analysis showed that the leaves act as an Na+ sink, while the plant roots possess superior K+ retention. The excessive Na+ absorbed from the soil was mainly transported to the shoot and was eventuallysequestrated into mesophyll vacuoles in the leaves. As a result, N. sibirica could keep the optimal balance of K+/Na+ at a tissue- and cell-specific level under saline condition. To enable this, N. sibirica increased both vacuolar H+-ATPase and H+-PPase enzymes activities and up-regulated the expressions of NsVHA, NsVP1 and NsNHX1 genes. Vacuolar Na+ sequestration in the leaf mesophyll, mediated by NsVHA, NsVP1 and NsNHX1, reduced the Na+ concentration in cytosol and inhibited further K+ loss. Meanwhile, N. sibirica enhanced the Two Pore K+ expression at the transcriptional level to promote K+ efflux from vacuole into cytoplasm, assisting in maintaining cytosolic K+ homeostasis. It is concluded that the tissue tolerance traits such as vacuolar Na+ sequestration and intracellular K+ homeostasis are critical to confer adaptation of N. sibirica to soil salinity. © The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: [email protected]

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