Title |
Interactions between Indole-3-acetic Acid Producing Acinetobacter sp. SW5 and Growth of Tomato Plant |
Author |
Hyeok-Do Kwon and Hong-Gyu Song* |
Address |
Department of Biological Sciences, Kangwon National University, Chuncheon 200-701, Republic of Korea |
Bibliography |
Korean Journal of Microbiology, 50(4),302-307, 2014 |
DOI |
http://dx.doi.org/10.7845/kjm.2014.4050
|
Key Words |
Acinetobacter sp. SW5, indole acetic acid, plant growth promotion, tomato root exudates, tryptophan |
Abstract |
Many rhizobacteria can promote plant growth through various direct or indirect mechanisms, and their production of
phytohormones such as indole-3-acetic acid (IAA) may have pronounced effects on growth and development of
plants. Rhizobacterial strain isolated from rhizosphere of foxtail (Setaria viridis), Acinetobacter sp. SW5 produced
118.1 mg/L of IAA and 4.5 mg/L of gibberellin (GA3) in brain heart broth medium at 2 and 1 day of incubation,
respectively. In a pot test the lengths of stem and root and fresh weight of the germinated tomato seedlings treated
with Acinetobacter sp. SW5 significantly increased by 26.3, 33.3, and 105.3%, respectively compared to those of the
uninoculated control in 12 weeks of cultivation. When the root exudate secreted from tomato seedlings was analyzed
by HPLC, 3.75 ng mg tomato root-1 of tryptophan which is an IAA precursor was detected. Acinetobacter sp. SW5
could produce 4.06 μM of IAA from root exudate from 8 tomato seedlings. Together with the capability of growth of
Acinetobacter sp. SW5 in the tomato root exudates, this IAA secreted by bacteria might contribute to enhance the
growth of tomato plants. |
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50(4)_06_p.302-307.pdf |