内生真菌对低磷胁迫下杉木幼苗生长及光合作用的影响

The Effect of Endophytic Fungus on the Growth and Photosynthesis of Cunninghamia lanceolate under Low Phosphorous Stress

通过浇施菌液,接种5株内生真菌NG1、CG5、AJ6、AJ14、AJ13于低磷胁迫下的杉木幼苗(Cunninghamia lanceolata)。接种15 d后进行低磷胁迫试验,测定苗高地径、根冠比、叶绿素含量以及叶绿素荧光等数据,分析内生真菌对杉木生长和光合作用的影响。结果显示:5株内生真菌中,AJ14菌株对苗高地径和根冠比的综合影响最大,促生效果最明显;NG1菌株对根冠比的影响最大。AJ14菌株在低磷胁迫各个时期提高了杉木幼苗体内的叶绿素含量,且实际光合效率较高。5株内生真菌接种的杉木在胁迫后期,Fo值小于CK,总体减小趋势明显;F_v/F_o和F_v/F_m值高于对照组,总体升高的趋势明显,说明内生真菌在促进了植物的光合作用方面有明显优势。结果表明:5株内生真菌对杉木的生长和光合作用有较大影响,AJ14、NG1菌株对杉木的生长和光合作用有明显的促进作用。

Five strains of endophytes fungus,NG1,CG5,AJ6,AJ14,and AJ13 were inoculated into the seedings of Cunninghamia lanceolate under low-phosphorus stress by spraying with the bacterial liquid.The experiment of low-phosphorus stress was carried out 15 days after inoculation.The data of the seadling-height,diameter,root-shoot ratio,chlorophyll and fluorescence were measured to analyze the effects of the endophytic fungus on the growth and photosynthesis of the seedings of C. lanceolate.The results showed that among the five strains of endophytic fungus,the effect of AJ14 strain on the seedling height and root-shoot ratio of C. lanceolate was the most significant,and the effect of promoting growth was the most obvious.The NG1 strain had most sig-nificant effect on the shoot-to-shoot ratio of C. lanceolate.The AJ14 strain increased the content of chlorophyll in C. lanceolate seedlings under low P stress and the photosynthetic efficiency was higher.Inoculated with 5 endophytic fungus Fo had a decreasing trend at the late stage of stress;and the values of the value of Fo was lower than that of CK;and the values of Fv/Fo and Fv/Fm were higher than those of CK.Photosynthesis had obvious advantages.The results showed that:5 endophytic fungus have a significant impact on the growth and photosynthesis,AJ14 and NG1 strains have an obvious promotion effect on the growth and photosynthesis of C. lanceolate.