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- W1980419776 abstract "대표적인 식물호르몬인 indole-acetic acid (IAA)를 생성하는 근권세균에서 IAA 생합성 경로와 생성량과의 관계를 파악하기 위해 IAA 생성능이 크게 다른 4개 균주를 선발하고 동정하였다. 특정 경로를 이용한 IAA 생합성능의 조사를 위해 주요 전구물질을 첨가하여 IAA 생성량을 측정하였다. Tryptophan 의존적 경로에 의한 총 IAA 생성량은 Acinetobacter guillouiae SW5가 1.66 mg/ml로 가장 높았으며, indole acetamide (IAM)를 배지에 첨가했을 때 amidase의 활성은 분리균주 중 Rhodococcus equi SW9이 가장 높았다. IAA 생합성을 위한 또 다른 두 가지 경로의 전구물질인 indole acetonitrile (IAN)을 첨가하였을 때 IAA 생합성은 A. guillouiae SW5가 가장 높았으며, 이 때 nitrilase 보다는 nitrile hydratase의 활성이 높았다. 그러나 두 경로 중 IAN을 직접 IAA로 전환시키는 nitrilase의 활성은 Bacillus thuringiensis SW17이 균주들 중 가장 높았다. B. thuringiensis SW17은 4균주 중 IAA생합성능이 가장 낮았으며 tryptophan을 이용하여 생합성하는 IAA 중 상당량을 IAM을 거치는 경로를 통해 생성한다. Lysinibacillus fusiformis SW13은 IAA 생합성에 관여하는 nitrile 전환경로들을 비교적 고르게 이용하여 IAA를 생성하였다. Tryptophan 비의존적 경로를 통한 IAA 생합성은 A. guillouiae SW5에서만 소량 관찰되었다. This study explores the interaction between the production of indole-3-acetic acid (IAA), a typical phytohormone auxin and the role of IAA biosynthetic pathways in each IAA producing rhizobacterial strain. The bacterial strains were isolated from rhizosphere of wild plants and identified as Acinetobacter guillouiae SW5, Bacillus thuringiensis SW17, Rhodococcus equi SW9, and Lysinibacillus fusiformis SW13. A. guillouiae SW5 exhibited the highest production of IAA using tryptophan-dependent pathways among the 4 strains. When indole-3-acetamide (IAM) was added, Rhodococcus equi SW9 showed the highest IAA production of <TEX>$3824{mu}g/mg$</TEX> protein using amidase activity. A. guillouiae SW5 also showed the highest production of IAA using two pathways with indole-3-acetonitrile (IAN), and its nitrile hydratase activity might be higher than nitrilase. B. thuringiensis SW17 showed the lowest IAA production, and most of IAA might be produced by the amidase activity, although the nitrilase activity was the highest among 4 strains. The roles of nitrile converting enzymes were relatively similar in IAA synthesis by Lysinibacillus fusiformis SW13. Tryptophan-independent pathway of IAA production was utilized by only A. guillouiae SW5." @default.
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- W1980419776 date "2012-03-31" @default.
- W1980419776 modified "2023-10-18" @default.
- W1980419776 title "Interactions between Biosynthetic Pathway and Productivity of IAA in Some Rhizobacteria" @default.
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- W1980419776 doi "https://doi.org/10.7845/kjm.2012.48.1.001" @default.
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