Abstract
Recently, there has been increasing attempts for photosynthetic bacteria (PSB) as foliar fertilizer in China. The biomass, net photosynthetic rate (Pn), maximal photochemical efficiency of PS II(Fv/Fm) and antioxidant isoenzymes metabolism were examined in Chinese dwarf cherry (Prunus humilis Bunge) seedlings with or without exogenous PSB application in this study. PSB sprays resulted in a significant accumulation of fresh weight and leaf area of Chinese dwarf cherry plants, accompanying with a marked increase of Pn. However, Fv/Fm had negligible changes. The exogenous PSB also induced the activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX), and a general increase of their isoenzymes activities. The increased level was the most significant in chloroplasts [such as Cu/Zn-SOD, Fe-SOD and stroma APX (sAPX)]. Our results demonstrated that PSB played a favorable role in growth and photosynthesis and improved the antioxidative capability in plants.
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