The Effects Of AM Fungi On The Growth, Drought Resistance And Total Flavonoid Content Of Caragana Microphylla Lam. And Amygdalus Mongolica Maxim

In this paper, we studied the effects of AM fungi on the growth, drought resistance and total flavonoid content of Caragana microphylla Lam. and Amygdalus mongolica Maxim, at different water condition.The main results were as follows:1. AM fungi can infect the two plants, Glomus mossesa was at the highest mycorrhizal infection rate and the mycorrhizal dependency to Caragana microphylla Lam., so as to Amygdalus mongolica Maxim., the highest was Glomus mosseae and Glomus intradice.2. Under normal water condition, AM fungi can significantly increased the content of the plant photosynthetic pigments and biomass, improve the water status of leaves, but have no significant effect to root-shoot ratio and root activity. The plant biomass and photosynthetic pigment are positively correlated relation with the infection rate. AM fungi decreased significantly (P<0.05) the MDA content of Caragana microphylla Lam., but it has no significant effects to Amygdalus mongolica Maxim. AM fungi have no significant effects on soluble sugar content of two plants. Glomus mossesa have a significant (P<0.05) effect on the total flavonoid content of Caragana microphylla Lam., so did mixed Glomus mosseae and Glomus intradice (P <0.05) with Amygdalus mongolica Maxim.3. Drought stress decreased the mycorrhizal infection rate, plant biomass, photosynthesis pigment content, root activity and RWC of two plants.The content of MDA is recreased,but the content of soluble sugar and total flavonoids is lower.4. Under drought stress, the two inoculates have a significantly difference (P<0.05) to aboveground fresh weight and plant height of Caragana microphylla Lam.It has a significantly difference (P<0.05) to the fresh weight and dry weight of the Amygdalus mongolica Maxim.with Glomus mosseae and Glomus intradice. AMF increased the RWC, decreased WSD, and significantly improved the root activity. The double factor of AMF and drought have a significant (P<0.05) or highly significant effect (P<0.01) to the plant biomass, photosynthetic pigment, root activity and RWC of Caragana microphylla Lam. dry weight, Chla and car of Amygdalus mongolica Maxim. Compared to non-inocluted plants, AM fungi increased the content of plant photosynthetic pigment and biomass.5. Under drought stress, the two inoculates significantly (P<0.05) reduced the MDA content of Caragana microphylla Lam. Glomus mosseae significantly increased the soluble sugar content and the total flavonoids content of leaf of Caragana microphylla Lam. The MDA and the flavonoid content of Amygdalus mongolica Maxim were significantly (P<0.05)reduced by inoculated with Glomus mosseae and Glomus intradice. The AMF and drought as double factor have a very significant effect (P<0.01) on MDA, soluble sugar and the total flavonoids of Caragana microphylla Lam. So did soluble sugar and total favonoids of Amygdalus mongolica Maxim.6. The comprehensive analysis of the membership function in fuzzy mathematics showed that Amygdalus mongolica Maxim had a highly dry resistance than Caragana microphylla Lam. by comparing the growth and physiological of Caragana microphylla Lam. with Amygdalus mongolica Maxim.