The Growth Promotive Effects of Mixed Endophytic Fungi on Cunninghamia lanceolata Seedlings Under Low-Phosphorus Stress
To further investigate the effects of mixed endophytic fungi with phosphorus-solubilizing capabilities on the growth and photosynthesis of Cunninghamia lanceolata seedlings under phosphorus stress conditions,one-year-old clone No.O2O of C.lanceolata was used as the experimental material.The seedlings were inoculated with single strains of fungi that have phos-phorus solubilization abilities and with mixed fungi.The growth characteristics and photosynthetic indices of C.lanceolata seedlings were measured.The results showed that in terms of seedling height,ground diameter,and biomass,both the sin-gle strain Colletotrichum gloeosporioides(S28)and the mixed fungi Cryptosporiopsis ericae(S1)+Nemania bipapillata(S41)significantly promoted the growth of seedling height and stem diameter across different phosphorus stress gradients.The single strain S28 and the mixed strains S1+S28 and S1+S41 had significant effects on seedling height,while S28,Glomerella acutata(S32),and the mixed strains S1+S32 and S32+S41 effectively promoted ground diameter growth.The root-to-shoot ratio of C.lanceolata seedlings inoculated with single strain S1 and mixed strains S1+S41,S28+S32,and S32+S41 consistently increased with the gradien of stress,with significant increases observed under moderate and severe stress conditions.Regarding chlorophyll mass fraction and chlorophyll fluorescence characteristics,the mixed strain S32+S41 showed a significant increase in chlorophyll mass fraction.As time progressed and stress gradients increased,inoculation with endophytic fungi effectively reduced the initial fluorescence value of C.lanceolata seedlings,thereby alleviating stress damage to the photosystem Ⅱ(PS Ⅱ)reaction center.The endophytic fungi did not significantly affect the maximum photo-chemical quantum yield(Fv/Fm)of PS Ⅱ in C.lanceolata seedlings,but they could promote the photosynthetic electron transport efficiency to some extent,thereby enhancing the photosynthetic rate.Endophytic fungi with phosphorus-solubiliz-ing capabilities can promote the growth and photosynthesis of C.lanceolata seedlings in phosphorus-stressed environments,with mixed fungi demonstrating overall superior effects compared to single strains.Among them,the mixed strain S32+S41 exhibited the most significant comprehensive effect.
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