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Citation:

Comparison on Osmotica Accumulation of Different Salt-tolerant Plants under Salt Stress

  • Received Date: 2015-06-11
  • In this study, the osmotic adjustment mechanism of different salt-tolerant plants under salt stress was analyzed. The Salix psammophila, Elaeagnus angustifolia, Tamarix chinensis and Nitraria sibirica were treated by different salt concentrations(0,100,200,and 300 mmol·L-1NaCl),the change of the content of inorganic and organic solutes and their role in osmotic adjustment regulation of the 4 types of salt-tolerant plants were evaluated. The results are as follows.(1)Among the 4 types plants, the content of Na+ and Cl- increased and K+,Ca2+,Mg2+ decreased under salt stress.(2)The salt-delution halophytes(N. sibirica)and salt-secretion halophytes(T. chinensis)took Na+ as the main inorganic osmotic adjustment, while the salt-exclusion halophytes(S. psammophila and E. angustifolia)took K+ as the main inorganic osmotic adjustment.(3)Soluble sugar was the common organic osmotic adjustment for the four types of plants under salt stress,and it was particularly important for S. psammophila and E. angustifolia;Proline was an important organic osmotic adjustment for El. angustifolia under high salt concentration(≥ 200 mmol·L-1NaCl)stress;The content of betaine increased significantly with salt concentration increase of N. sibirica leaves, it also has an important role to improve the salt-tolerance of N. sibirica. There were significant differences in accumulation of osmotic adjustment substances, also the osmotic regulation and mechanisms of salt resistance had differences under saline stress of the 4 types of salt-tolerant plants.
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Comparison on Osmotica Accumulation of Different Salt-tolerant Plants under Salt Stress

  • 1. Nanjing Forestry University, Nanjing 210037, Jiangsu, China
  • 2. Research Center of Saline and Alkali Land of State Forestry Administration, Beijing 100091, China

Abstract: In this study, the osmotic adjustment mechanism of different salt-tolerant plants under salt stress was analyzed. The Salix psammophila, Elaeagnus angustifolia, Tamarix chinensis and Nitraria sibirica were treated by different salt concentrations(0,100,200,and 300 mmol·L-1NaCl),the change of the content of inorganic and organic solutes and their role in osmotic adjustment regulation of the 4 types of salt-tolerant plants were evaluated. The results are as follows.(1)Among the 4 types plants, the content of Na+ and Cl- increased and K+,Ca2+,Mg2+ decreased under salt stress.(2)The salt-delution halophytes(N. sibirica)and salt-secretion halophytes(T. chinensis)took Na+ as the main inorganic osmotic adjustment, while the salt-exclusion halophytes(S. psammophila and E. angustifolia)took K+ as the main inorganic osmotic adjustment.(3)Soluble sugar was the common organic osmotic adjustment for the four types of plants under salt stress,and it was particularly important for S. psammophila and E. angustifolia;Proline was an important organic osmotic adjustment for El. angustifolia under high salt concentration(≥ 200 mmol·L-1NaCl)stress;The content of betaine increased significantly with salt concentration increase of N. sibirica leaves, it also has an important role to improve the salt-tolerance of N. sibirica. There were significant differences in accumulation of osmotic adjustment substances, also the osmotic regulation and mechanisms of salt resistance had differences under saline stress of the 4 types of salt-tolerant plants.

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