Abstract
Little is known about the physiological adaptation mechanisms of the desert halophyte Nitraria tangutorum Bobr. to the environment. In this study, callus from Nitraria tangutorum Bobr. was used to investigate physiological responses to salinity and the regulatory function of nitric oxide (NO) on catalase (CAT) activity. Increased dry weight and soluble proteins were observed in the callus exposed to lower salinity (50 and 100 mM NaCl), whereas 200 mM NaCl led to significant decreases of these two growth parameters, and the levels of proline and soluble carbohydrates also were enhanced under NaCl treatment. In addition, short-term stress from 50 mM NaCl and the application of lower sodium nitroprusside (SNP, a NO donor) concentration resulted in decreased levels of malondialdehyde (MDA). In contrast, higher concentrations of NaCl and SNP induced significant oxidative damage in Nitraria tangutorum Bobr. callus. Analysis based on the fluorescent probe DAF-FM DA revealed that NaCl and SNP treatment led to enhanced levels of NO in the callus cells. Moreover, the NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (c-PTIO) reduced endogenous NO concentrations and abolished the enhancement in dry weight and the decrease in MDA level under 50-mM-NaCl treatment. CAT activity increased under salt stress, and the 50-mM-NaCl effect was alleviated by treatment with c-PTIO or the nitric oxide synthase inhibitor Nω-nitro-l-arginine. We suggest that Nitraria tangutorum Bobr. callus exhibited tolerance to lower-salinity stress. We also showed that increased NO generation in response to salinity might be associated with regulation of growth, protection against oxidative damage, and excitation of CAT activity in Nitraria tangutorum Bobr. callus under salt stress.
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This work was financially supported by the National Natural Science Foundation of China (No. 30960064), and the National Science Foundation for Distinguished Young Scholars of China (Grant No. 30625008).
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Yang, Y., Wei, X., Shi, R. et al. Salinity-induced Physiological Modification in the Callus from Halophyte Nitraria tangutorum Bobr.. J Plant Growth Regul 29, 465–476 (2010). https://doi.org/10.1007/s00344-010-9158-8
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DOI: https://doi.org/10.1007/s00344-010-9158-8