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KMID : 0364820130490010046
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Korean Journal of Microbiology
2013 Volume.49 No. 1 p.46 ~ p.50
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Growth Promotion of Tomato Plant under Drought Conditions by Treatment of Rhizobacteria Producing ACC Deaminase and Phytohormones
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Seo Mi-So
Song Hong-Gyu
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Abstract
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Some rhizobacteria producing 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase can make plant to continue
growth under the stress conditions through lowering the level of phytohormone, ethylene which inhibits the plant
growth and accelerates plant aging. In this study, some rhizobacteria producing ACC deaminase have been isolated
from the rhizosphere of plants grown at sand beaches, and identified as Escherichia hermannii m-2, Enterobacter
asburiae m-4, Pseudomonas thivervalensis BD2-26 and Pseudomonas brassicacearum subsp. neoaurantiaca
BD3-35 through sequencing of 16S rRNA genes. Strain BD3-35 showed the highest activity of ACC deaminase
among the isolates, 20.26 α-ketobutyrate μM/mg protein/h. Strains BD3-35 and BD2-26 secreted a phytohormone
cytokinin, and strains m-4 and m-2 could produce auxin and abscisic acid, respectively. When these bacteria were
applied to the 7-day old tomato plant under drought stress for 7 days, strains BD3-35, m-2, and m-4 increased the
length of tomato root by 14, 15, and 35%, respectively, and strains m-2, BD2-26 and BD3-35 increased the dry
weight of tomato plant by 22, 33, and 68%, respectively compared to the uninoculated control tomatoes. Therefore,
these rhizobacteria may be utilized as a microbial fertilizer for the plants under drought stress.
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KEYWORD
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ACC deaminase, drought stress, phytohormones, plant growth promotion
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