内生多粘类芽孢杆菌S-7对甜菜光合作用及产量和品质的影响

研究了内生多粘类芽孢杆菌（Paenibacillus polymyxa）S-7对甜菜叶片光合参数和产量的影响.结果表明：接种内生多粘类芽孢杆菌S-7能显著促进甜菜光合作用，其中叶片净光合速率(P_n)、气孔限制值(L_s)、气孔导度(G_s)和蒸腾速率(T_r )的平均值分别提高了16.11%、23.82%、41.91%和34.80%;叶片胞间CO₂浓度(C_i)平均值降低了21.09%.生物学产量和含糖率分别提高了25.63%和17.46%，促进了甜菜产量和品质提高.表明内生菌不仅影响甜菜光合参数，而且对甜菜产量和品质的提高具有明显的促进作用.

Effects of endophytic Paenibacillus polymyxa S-7 on photosynthesis, yield,and quality of sugar beet.

This study showed that inoculation of endophytic Paenibacillus polym yxa S-7 could significantly (P<005) promote the photosynthesis of sugar beet. After the inoculation, the leaf net photosynthetic rate (Pn), stoma tal limitation (Ls), stomatal conductance (Gs), and transpiration r ate (Tr) increased by 1611%, 2382%, 4191%, and 3480%, respectively , while the stomatal intercellular CO2 concentration (Ci) decreased by 2 1. 09%. Inoculation of endophytic P. polymyxa S-7 could also increase sugar be et yield and its quality significantly (P<005), with the tuberous root bio mass and its sugar content increased by 2563% and 1746%, respectively. It wa s concluded that endophytic P. polymyxa S-7 not only affected the photosynt hetic parameters, but also promoted the yield and quality of sugar beet.