scholarly journals Apical‐root apoplastic acidification affects cell wall extensibility in wheat under salinity stress

2021 ◽  
Author(s):  
Yang Shao ◽  
Xiaohui Feng ◽  
Hiroki Nakahara ◽  
Muhammad Irshad ◽  
Eneji A. Egrinya ◽  
...  
Keyword(s):  
Cell Wall ◽  
Salinity Stress ◽  
Cell Wall Extensibility ◽  
Wall Extensibility

scholarly journals Apical-root apoplastic acidification affects cell-wall extensibility in wheat under salinity stress

2020 ◽  
Author(s):  
Yang Shao ◽  
Xiaohui Feng ◽  
Hiroki Nakahara ◽  
Muhammad Irshad ◽  
A. Egrinya Eneji ◽  
...  
Keyword(s):  
Cell Wall ◽  
Root Growth ◽  
Salinity Stress ◽  
Root Elongation ◽  
Elongation Zone ◽  
Cell Wall Extensibility ◽  
Cell Wall Loosening ◽  
Dependent Cell ◽  
Wall Loosening ◽  
Wall Extensibility

AbstractPlant salt tolerance is closely associated with a high rate of root growth. Although root growth is governed by cell-wall and apoplastic pH, the relationship between these factors in the root elongation zone under salinity stress remains unclear. Here, we assess apoplastic pH, pH- and expansin-dependent cell-wall extensibility, and expansin expression in the root elongation zone of salt-sensitive (Yongliang-15) and -tolerant (JS-7) cultivars under salinity stress. A six-day 80 mM NaCl treatment significantly reduced apical-root apoplastic pH, from 6.2 to 5.3, in both cultivars. Using a pH-dependent cell-wall extensibility experiment, we found that, under 0 mM NaCl treatment, the optimal pH for cell-wall loosening was 6.0 in the salinity-tolerant cultivar and 4.6 in the salinity-sensitive cultivar. Under 80 mM treatment, a pH of 5.0 mitigated the cell-wall stiffness caused by salinity stress in the salinity-tolerant cultivar, but promoted cell-wall stiffening in the salinity-sensitive cultivar. These changes in pH-dependent cell-wall extensibility are consistent with differences in the root growth of two cultivars under salinity stress. Exogenous expansin application, and expansin expression experiments, we found that salinity stress altered expansin expression, differentially affecting cell-wall extensibility under pH 5.0 and 6.0. TaEXPA7 and TaEXPA8 induced cell-wall loosening at pH 5.0, whereas TaEXPA5 induced cell-wall loosening at pH 6.0. These results elucidate the relationship between expansin and cell-wall extensibility in the root elongation zone, with important implications for enhancing plant growth under salinity stress.

scholarly journals Aluminum Targets Elongating Cells by Reducing Cell Wall Extensibility in Wheat Roots

2004 ◽  
Vol 45 (5) ◽  
pp. 583-589 ◽  
Author(s):  
Jian Feng Ma ◽  
Renfang Shen ◽  
Sakiko Nagao ◽  
Eiichi Tanimoto
Keyword(s):  
Cell Wall ◽  
Cell Wall Extensibility ◽  
Wheat Roots ◽  
Wall Extensibility
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