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Journal of Bioscience and Bioengineering
Vol.118, No.1, 2014; Pages:
41 - 44

Plant growth-promoting bacterium Acinetobacter calcoaceticus P23 increases the chlorophyll content of the monocot Lemna minor (duckweed) and the dicot Lactuca sativa (lettuce)

Wakako Suzuki, Masayuki Sugawara, Kyoko Miwa, Masaaki Morikawa

Graduate School of Environmental Science, Hokkaido University, N10-W5, Kita-ku, Sapporo 060-0810, Japan


Acinetobacter calcoaceticus P23 is a plant growth-promoting bacterium that was isolated from the surface of duckweed (Lemna aoukikusa). The bacterium was observed to colonize on the plant surfaces and increase the chlorophyll content of not only the monocotyledon Lemna minor but also the dicotyledon Lactuca sativa in a hydroponic culture. This effect on the Lactuca sativa was significant in nutrient-poor (1/100 dilution of H2 medium) and not nutrient-rich (1 or 1/10 dilutions of H2 medium) conditions. Strain P23 has the potential to play a part in the future development of fertilizers and energy-saving hydroponic agricultural technologies.

Keywords: Plant growth-promoting bacteria; Acinetobacter calcoaceticus P23; Lemna minor; Lactuca sativa; Chlorophyll content

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