OBJECTIVE： To study the effects of Sinorhizobium fredii， Rhizobium radiobacter and Azorhizobium caulinodans on germination of Andrographis paniculata seed under drought and salt stress condition. METHODS： Drought and salt stress models of A. paniculata seed were established with PEG-6000 （called “PEG” for short）and NaCl respectively. The effects of different concentrations of PEG （0.05， 0.10， 0.15， 0.20， 0.25 g/mL） and NaCl （50， 100， 150， 200 mmol/L） on the germination indicators （germination rate， germination potential， germination index， vigor index） of A. paniculata seed were investigated by the method of germination on dish paper. The seeds were soaked with S. fredii， R. radiobacter and A. caulinodans， and then germination indicators were investigated under the condition of drought and salt stress. RESULTS： Drought and salt stress models of A. paniculata seed were established with 0.15 g/mL PEG solution and 50 mmol/L NaCl solution， respectively. S. fredii pretreatment could significantly improve all the germination indicators of A. paniculata seed under drought stress condition， as well as germination index and vigor index of it under salt stress condition， but significantly reduce germination rate and germination index of it under salt stress condition （P＜0.05）. R. radiobacter treatment could significantly improve all the germination indicators of A. paniculata seed under drought stress condition， as well as germination potential， germination index and vigor index of it under salt stress condition （P＜0.05）. A. caulinodans pretreatment could significantly improve germination rate， germination index and vigor index of A. paniculata seed under drought stress condition， as well as germination rate and germination potential of it under salt stress condition （P＜0.05）. CONCLUSIONS： Three kinds of Rhizobia can improve germination ability of A. paniculata seed under drought or salt stress condition to different degrees. This research can provide technical support for planting and cultivation of A. paniculata under drought condition， and using saline-alkali soil as A. paniculata plantation area.

OBJECTIVE： To study the effects of 60Co-γ radiation on the botanical traits and property of Andrographis paniculata， and to screen suitable irradiation dose. METHODS： The seeds of A. paniculata were irradiated by 60Co-γ rays with different irradiation doses（0，10，20，50，100，200，300 Gy）. The botanical traits indexes of A. paniculata as seed germination rate， root length， seedling rate， seedling height， leaf area， fresh weight， dry weight， stomata number of lower epidermis of leaf， and its property indexes as the contents of andrographolide， dehydrated andrographolide and chlorophyll， activity of T-SOD enzyme and CuZn-SOD enzyme， were determined after radiation. The coefficient of variation （CV） was calculated. The linear regression analysis was performed for seedling rate， and medial lethal dose was calculated. The correlation analysis was performed between the parameters of botanical trait and quality property with irradiation dose. Cluster analysis was conducted for M1 generation of A. paniculata in different irradiation dose groups by connection method combined with squared euclidean distance. RESULTS： Different irradiation doses showed different effects on botanical traits and property of A. paniculata. According to the average value of CV， the index of botanical traits was ranked as leaf area ＞ fresh weight ＞ dry weight ＞ plant height ＞ root length ＞ stomata number ＞ seedling rate ＞ germination rate； among different irradiation dose groups， the coefficient of variation was ranked as 50 Gy＞200 Gy＞100 Gy＞20 Gy＞10 Gy＞300 Gy＞0 Gy. According to the average value of CV， the index of property was ranked as dehydrated andrographolide content＞andrographolide content＞chlorophyll content＞CuZn-SOD enzyme activity＞T-SOD enzyme activity； among different irradiation dose groups， the coefficient of variation was ranked as 100 Gy＞50 Gy＞200 Gy＞20 Gy＞10 Gy＞300 Gy＞0 Gy. The medial lethal dose was 195.10 Gy. According to the botanical traits， M1 generation of A. paniculata of 7 dose groups could be divided into 4 types. According to the property， M1 generation of A. paniculata of 7 dose groups could be divided into 3 types. CONCLUSIONS： The suitable irradiation dose interval for irradiating A. paniculata is 50-200 Gy.