Abstract:
The effects of NaCl stress on photosynthesis of seedlings of 4 species were studied to provide a reference for garden plant selection of salt tolerant. Seedlings of
Hibiscus rosa-sinensis,
Ixora chinensis,
Schefflera arboricola,
Cordyline fruticosa were placed in simulating salt environment, and then their photosynthetic indexes were determined. Results showed that at 0.3% salt concentration, with increasing salt stress time,
Pn of the 4 species continuously decreased.
Gs of
H. rosa-sinensis continuously decreased, whereas the other species decreased followed by an increase.
Ci of
H. rosa-sinensis and
S. arboricola continuously decreased, and
I. chinensis decreased followed by an increase,
C. fruticosa continuously increased.
Tr of
H. rosa-sinensi continuously decreased, and the other species decreased followed by an increase. At 0.6% salt concentration,
Pn of seedlings of the 4 species continuously decreased.
Gs of
H. rosa-sinensis, I. chinensis and
S. arboricola decreased followed by an increase,
C. fruticosa continuously decreased.
Ci of
H. rosa-sinensis, I. chinensis and
S. arboricola decreased followed by an increase, whereas
C. fruticosa increased and then decreased.
Tr of seedlings of the 4 species decreased followed by an increase. The overall judgment from
Pn,
Gs,
Ci and
Tr of the 4 plant species,
H. rosa-sinensis and
S. arboricola had stronger salt tolerance among 4 species and was more suitable for cultivation in salt land, and salt tolerance of
I. chinensis was medium, whereas that of
C. fruticosa was weaker.