Photosynthetica 2019, 57(2):500-511 | DOI: 10.32615/ps.2019.065

Leaf photosynthetic characteristics and photosystem II photochemistry of rice (Oryza sativa L.) under potassium-solubilizing bacteria inoculation

M. YAGHOUBI KHANGHAHI1, H. PIRDASHTI1, H. RAHIMIAN2, G.H. NEMATZADEH3, M. GHAJAR SEPANLOU5, E. SALVATORI6, C. CRECCHIO7
Department of Agronomy, Genetics and Agricultural Biotechnology Institute of Tabarestan and Sari Agricultural Sciences and Natural Resources University, 9th km of Farah Abad Road, 4818168984, Sari, M&5x101;zandar&5x101;n, Iran1
2 Department of Plant Pathology, Sari Agricultural Sciences and Natural Resources University, 9th km of Farah Abad Road, 4818168984, Sari, M&5x101;zandar&5x101;n, Iran
3 Department of Plant Breeding, Genetics and Agricultural Biotechnology Institute of Tabarestan and Sari Agricultural Sciences and Natural Resources University, 9th km of Farah Abad Road, 4818168984, Sari, M&5x101;zandar&5x101;n, Iran
5 Department of Soil Sciences, Sari Agricultural Sciences and Natural Resources University, 9th km of Farah Abad Road, 4818168984, Sari, M&5x101;zandar&5x101;n, Iran
6 Department of Environmental Biology, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
7 Department of Soil, Plant and Food Sciences, University of Bari Aldo Moro, Via Amendola 165/a, 70125 Bari, Italy

The current research was performed to investigate the effects of three potassium-solubilizing bacteria (KSB) strains (Pantoea agglomerans, Rahnella aquatilis, and Pseudomonas orientalis) on leaf photosynthetic characteristics in rice (Oryza sativa L. cv. Pajohesh). A pot and a field experiment were conducted in a paddy field. The results indicated that the KSB inoculums significantly enhanced chlorophyll (Chl) a, Chl a+b, SPAD value, and stomatal conductance as compared to the control in both experiments, especially when applied along with half the recommended dose of the potassium chemical fertilizer. KSB inoculations, alone or combined with K fertilizer, significantly increased the value of photochemical quenching, photosynthetic electron transport rate, and the effective quantum efficiency as compared to the control. In conclusion, these native KSB strains could be used as inoculants to reduce consumption of K chemical fertilizer and improve the efficiency of photosynthesis for rice production under the flooding irrigation conditions.

Additional key words: Additional key words: chlorophyll florescence; grain yield; photosynthetic pigments; potassium uptake; potassium utilization.

Received: August 29, 2018; Accepted: December 14, 2018; Prepublished online: April 16, 2019; Published: May 16, 2019  Show citation

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YAGHOUBI KHANGHAHI, M., PIRDASHTI, H., RAHIMIAN, H., NEMATZADEH, G.H., GHAJAR SEPANLOU, M., SALVATORI, E., & CRECCHIO, C. (2019). Leaf photosynthetic characteristics and photosystem II photochemistry of rice (Oryza sativa L.) under potassium-solubilizing bacteria inoculation. Photosynthetica57(2), 500-511. doi: 10.32615/ps.2019.065
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