RESEARCH ARTICLE

Effect of NaCl stress on ion distribution in roots and growth of Cyclocarya paliurus seedlings

  • Ruiling YAO ,
  • Shengzuo FANG
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  • College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, china

Published date: 05 Jun 2009

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

We studied ion distribution in roots and the growth of Cyclocarya paliurus seedlings of three provenances, Huangshan in Anhui, Jiujiang in Jiangxi and Kunming in Yunnan, under conditions of 0, 1, 3 and 5 g/L NaCl stress using X-ray microanalysis. Results show that under NaCl stress of 3 and 5 g/L, the relative contents of Na+ and Cl in root tissues increased, while the relative content of K+, Ca2+ and Mg2+ decreased. With an increase in salinity, the relative contents of Na+ in the epidermis and cortex of the root increased, while the relative content of Cl in the stele and cortex of the root increased markedly. Thus, ions in the root tissues were unbalanced and the ratios K+/Na+ and Ca2+/Na+ decreased, while Na+/(K++Na++Ca2++Mg2+) increased. The decrease of the K+/Na+ ratio and the substantial increase of Cl in root tissues contributed to a decline in seedlings survival and reduced the increments for seedling leaf area, height, basal diameter as well biomass. Our preliminary conclusion is that the level of salt tolerance for the tested provenance seedlings was in the order of Huangshan>Kunming>Jiujiang, and the threshold of salt tolerance for C. paliurus seedlings was about 1 g/L.

Cite this article

Ruiling YAO , Shengzuo FANG . Effect of NaCl stress on ion distribution in roots and growth of Cyclocarya paliurus seedlings[J]. Frontiers of Forestry in China, 2009 , 4(2) : 208 -215 . DOI: 10.1007/s11461-009-0007-5

Acknowledgements

We gratefully thank Prof. Yongqiang Mao of the Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, for his help in measuring the relative ion content of the roots. Our study was supported by the National Natural Science Foundation of China (Grant No. 30371156) and the Project of Research for New High Technology in Jiangsu Province (No. BG2006314).
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