Effects of salt stress on physiological characteristics of seedlings of four garden plant species
Physiological changes of seedlings of Hibiscus rosa-sinensis, Ervatamia divaricata, Schefflera arboricola and Duranta repens were evaluated at 0.3% and 0.6% NaCl concentrations in order to provide scientific basis for screening salt tolerant plants. Principal component analysis was used to evaluate salt tolerant of seedlings of the four species through determining their physiological indexes. The results showed that with increase of salt stress time, at 0. 3% salt concentration, the chlorophyll content, soluble sugar content, SOD activity and membrane permeability of seedlings of the four species tended to increase; the 4 species showed different change patterns in proline and protein, MDA content of H. rosa-sinensis and S. arboricola continuously increased, E. divaricate decreased after an increase, D. repens increased first and then decreased. At 0.6% salt concentration, the chlorophyll content, proline content and SOD activity of seedlings of the 4 species increased first and then decreased; soluble sugar content, soluble protein content and the relative membrane permeability tended to increase;MDA content of H. rosa-sinensis, S. arboricola and D. repens continuously increased,whereas E. divaricata decreased followed by an increase. Principal component analysis showed that at 0. 3% salt concentration, salt tolerance of seedlings of four species decreased in the order of D. Repens >E. divaricata > S. arboricola > H. rosa-sinensis, whereas at 0. 6% salt concentration, it decreased in the order of D. repens > E. divaricata > H. rosa-sinensis > S. arboricola. Salt tolerance of E. divaricata, and D. repens was greater than other species, which may be used as salt tolerant garden plants.
salt stressphysiological indexprincipal component analysisseedling
NETL
NSTL
万方数据
维普
