Effects of Plant Growth Promoting Rhizobacteria on Photosynthetic Characteristics and Growth of ′Carolina′ Before and After Florescence Under Low Light

Taking Holland double Lily ′Carolina′ as material, the photosynthetic indexes and plant growth were researched by inoculating potted with Sphingobacterium (SN-2), Acinetobacterium (BG and XG), Chryseobacterium (F) and 4 mixed PGPR strains under low light conditions. The results showed that with 70% shading condition, there were some differences on promoting photosynthetic characteristics and growth of ′Carolina′ which inoculated different strains before and after flowering, the maximum net photosynthetic rate (P_max), light saturation point (LSP) and apparent quantum yield (ϕ) of plants were significantly increased by inoculatingwith XG, SN-2 and HH compared with the control, while the effect of mixed inoculation of HH on ′Carolina′ was better than that of single inoculation with XG and SN-2, which indicated that there may be an interactive effect among different strains, but the growth effect was not obvious by inoculating F and BG strains, which may be related to light intensity. In addition, the SPAD content and plant height of ′Carolina′ were significantly increased by inoculating with XG, SN-2 and HH, especially the effect of HH on plant height was obvious. HH and SN-2 promoted the flowering time of ′Carolina′ to be 3 to 7 days earlier than the control, and XG followed.