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Abstract: Glycine gracilis was used as the experimental material. We tried to explore the difference in growth and photosynthetic characteristics of G. gracilis seedling under different types of salt stress, and revealed the physiological stress adaptation mechanisms for semi-wild soybean under salt stress. The results showed that low concentration salt stress increased the parameters of growth, but they were inhibited when plants were subjected to high concentration NS and AS. The inhibition effect of NS and low concentrations of AS on the total photosynthetic pigments and chlorophyll contents was not significant, and they promoted the accumulation of carotenoids and chlorophyll a/b. High concentrations of AS significantly inhibited the content of chlorophyll and carotenoids and reduced the value of chlorophyll a/b. The daily changes trend and daily means in PN, E, gs, WUE were significantly different under two types of salt stress. PNmax increased at the beginning and then decreased as AS rose. LCP of G. gracilis was negatively correlated with stress intensity under NS, but positively correlated with stress intensity for AS. For NS, Resp, Vcmax, Jmax and VTPU increased at first and then decreased as the salt concentration increasing. However, they gradually declined for AS. Studies have confirmed that the range for the inhibition effect on the growth of G. gracilis seedlings were different for the two types salt stress. The net photosynthetic rate of G. gracilis also decreased for different reasons. These results also showed that G. gracilis could adapt to the salt stress in certain extent.

Key words: Glycine gracilis; Saline stresses; Growth; Photosynthetic characteristics.

*Corresponding author: fax: 086-431-85695065, e-mail: lianxuanshi@nenu.edu.cn