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

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

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(Pn)、气孔限制值(Ls)、气孔导度(Gs)和蒸腾速率(Tr)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(Ci)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.

This study showed that inoculation of endophytic Paenibacillus polymyxa S-7 could significantly （ P 〈 0. 05 ） promote the photosynthesis of sugar beet. After the inoculation, the leaf net photosynthetic rate （Pn）, stomatal limitation （Ls）, stomatal conductance （ Gs ）, and transpiration rate （Tr） increased by 16. 11%, 23.82%, 41.91%, and 34. 80%, respectively, while the stomatal intercellular CO2 concentration （ Ci ） decreased by 21.09%. Inoculation of endophytic P. polymyxa S-7 could also increase sugar beet yield and its quality significantly （P 〈 0. 05）, with the tuberous root biomass and its sugar content increased by 25. 63% and 17. 46%, respectively. It was concluded that endophytic P. polymyxa S-7 not only affected the photosynthetic parameters, but also promoted the yield and quality of sugar beet.