NDLI: Effects of salt stress and exogenous Ca$^{2+}$ on Na$^{+}$ compartmentalization, ion pump activities of tonoplast and plasma membrane in Nitraria tangutorum Bobr. leaves

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Effects of salt stress and exogenous Ca$^{2+}$ on Na$^{+}$ compartmentalization, ion pump activities of tonoplast and plasma membrane in Nitraria tangutorum Bobr. leaves

Content Provider	Springer Nature Link
Author	Liu, Wei Yuan, Xiaoting Zhang, Yanyan Xuan, Yanan Yan, Yongqing
Copyright Year	2014
Abstract	Nitraria tangutorum Bobr. is a typical halophyte with superior tolerance to salinity. However, little is known about its physiological adaptation mechanisms to the salt environment. In the present study, N. tangutorum seedlings were treated with different concentrations of NaCl (100, 200, 300 and 400 mmol L$^{−1}$) combined with five levels of Ca$^{2+}$ (0, 5, 10, 15 and 20 mmol L$^{−1}$) to investigate the effects of salt stress and exogenous Ca$^{2+}$ on Na$^{+}$ compartmentalization and ion pump activities of tonoplast and plasma membrane (PM) in leaves. Na$^{+}$ and Ca$^{2+}$ treatments increased the fresh weight and dry weight of N. tangutorum seedlings. The absorption of Na$^{+}$ in roots, stems and leaves was substantially increased with the increases of NaCl concentration, and Na$^{+}$ was mainly accumulated in leaves. Exogenous Ca$^{2+}$ reduced Na$^{+}$ accumulation in roots but promoted Na$^{+}$ accumulation in leaves. The absorption and transportation of Ca$^{2+}$ in N. tangutorum seedlings were inhibited under NaCl treatments. Exogenous Ca$^{2+}$ promoted Ca$^{2+}$ accumulation in the plant. Na$^{+}$ contents in apoplast and symplast of leaves were also significantly increased, and symplast was the main part of Na$^{+}$ intracellular compartmentalization. The tonoplast H$^{+}$-ATPase and H$^{+}$-PPase activities were significantly promoted under salt stress (NaCl concentrations ≤300 mmol L$^{−1}$). PM H$^{+}$-ATPase activities gradually increased under salt stress (NaCl concentrations ≤200 mmol L$^{−1}$) followed by decreases with NaCl concentration increasing. The tonoplast H$^{+}$-ATPase, H$^{+}$-PPase and PM H$^{+}$-ATPase activities increased first with the increasing exogenous Ca$^{2+}$ concentration, reached the maximums at 15 mmol L$^{−1}$ Ca$^{2+}$, and then decreased. The tonoplast and PM Ca$^{2+}$-ATPase activities showed increasing trends with the increases of NaCl and Ca$^{2+}$ concentration. These results suggested that certain concentrations of exogenous Ca$^{2+}$ effectively enhanced ion pump activities of tonoplast and PM as well as promoted the intracellular Na$^{+}$ compartmentalization to improve the salt tolerance of N. tangutorum.
Starting Page	2183
Ending Page	2193
Page Count	11
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	36
Issue Number	8
e-ISSN	18611664
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-06-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Exogenous Ca$^{2+}$ Ion pump activity Na$^{+}$ compartmentalization Nitraria tangutorum Bobr. Salt stress Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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