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NaCl-induced changes in vacuolar H+-ATPase expression and vacuolar membrane lipid composition of two shrub willow clones differing in their response to salinity

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Abstract

It has been suggested that vacuolar H+-ATPase (V-H+-ATPase) plays a pivotal role in salt stress, and salt stress could modulate the expression and enzyme activity of V-H+-ATPase. In this work, salt modulation of V-H+-ATPase and tonoplast fatty acid compositions were evaluated in two shrub willow clones differing in salt tolerance after 3, 6 and 12 days of treatment. The results showed that the activity of V-H+-ATPase was regulated in tissue and clone specifically under NaCl stress. In the leaves of salt-tolerant clone 2345, treatment with 100 mM NaCl increased V-H+-ATPase activity first and then decreased it at day 12, while V-H+-ATPase activity was stimulated in the roots by NaCl during the treatment time. In contrast, V-H+-ATPase activity reached the highest value at day 3 in the leaves of salt-sensitive clone 2367 and then it decreased. Accumulation of Na+ in the vacuole was observed in parallel with increase in V-H+-ATPase activity. Western blot and immunofluorescence analysis of V-H+-ATPase subunit E revealed that the protein content varied in parallel with V-H+-ATPase activity. Moreover, a decreased unsaturated fatty acids ratio to saturated ones together with an increased V-H+-ATPase activity was detected in the roots of salt-tolerant clone 2345 at day 12. Altogether, it suggested that the induction of V-H+-ATPase expression and increase in the saturation of tonoplast fatty acids as a homeostatic mechanism for shrub willow to cope with salt stress.

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Acknowledgements

This work was supported by the National Natural Science Foundation in China (31300515).

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Correspondence to Qiang Zhang or Yanming Fang.

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10725_2018_442_MOESM1_ESM.tif

Supplementary Figure 1 Representative EDAX spectrum of the leaf (A) and root (B). Inset: TEM image for X-ray microanalysis. The right micrograph is vacuole (TIF 15351 KB)

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Zhang, M., Chen, Q., Zhou, P. et al. NaCl-induced changes in vacuolar H+-ATPase expression and vacuolar membrane lipid composition of two shrub willow clones differing in their response to salinity. Plant Growth Regul 86, 445–453 (2018). https://doi.org/10.1007/s10725-018-0442-0

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  • DOI: https://doi.org/10.1007/s10725-018-0442-0

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