[Effects of salt stress on the growth and Na+ and K+ contents in Aeluropus littoralis var. sinensis Debeaux].

After seedlings of Aeluropus littoralis var. sinensis Debeaux were treated with different NaCl concentrations (0-200 mmol/L) for 17 days, some physiological indexs were measured. With an increase in NaCl concentration, the growth of A. littoralis was inhibited gradually. There was no optimum salt concentration, and the shoots were more sensitive than the roots. The proportion of organic dry weight in total dry weight increased, which implies that the contribution of organic matter to osmotic adjustment increased with salinity. After being treated with the inhibitor--benzene-sulphuric acid choline which could inhibit the salt glands to secrete the salinity outside the body. The Na(+) and K(+) contents of leaves increased, while the amount of Na(+) and K(+) decreased in the secretion, and the growth was severely inhibited. After being treated with NaCl 100 mmol/L, the relative Na(+) contents in the cap cells and basal cells determined by X-ray microanalysis were from about one to more than triple those of the epidermis and mesophyllous cells, it shows that the salt glands could effectively collect Na(+) from other cells and secrete them outside the body to keep normal physiological function.