[Study on physiological characteristics and effects of salt stress in Andrographis paniculata].
OBJECTIVE
To study the physiological characteristics and effects of salt stress in Andrographis paniculata.


METHODS
Andrographis paniculata was treated with NaCl of different concentration. The photosynthetic characteristics and transpiration rate were an- alyzed by LI-6400 Portable Photosynthesis System. The activities of enzymes were studied with kits.


RESULTS
The net photosynthetic rate (Pn) and stomatal conductance (Gs) showed a diurnal variation of bimodal curve, the transpiration rate (Tr) and stomatal limitation (Ls) both had a single peak diurnal variation, while the intercellular CO2 concentration (Ci) and the water use efficiency (WUE) presented a single valley type of diurnal variation. With salt concentration rising, Pn, Tr, Ci, Ca and WUE decreased but L, increased, the activities of SOD, CAT and POD increased firstly and then decreased, while the MDA and proline content showed a rising trend.


CONCLUSIONS
Andrographis paniculata is a type of sun plant. The net photosynthetic rate of Andrographis paniculata leaves has an obvious "midday depression" phenomenon. The results also indicate that Andrographis paniculata has a resistance to salt stress and appropriate shade is good for the quality improvement.
Juan
J
Chen
Wei
W
Gu
Jin-Ao
JA
Duan
Shu-Lan
SL
Su
Jing
J
Shao
Chao
C
Geng
D035685:Andrographis / Q000187:drug effects*; D010788:Photosynthesis; D018515:Plant Leaves / Q000187:drug effects; D012965:Sodium Chloride / Q000494:pharmacology*; D013312:Stress, Physiological / Q000187:drug effects*; D014867:Water
D014867:Water; D012965:Sodium Chloride