Abstract
Bacterial production of indole-3-acetic acid (IAA) and its effects on plant growth have been frequently studied but there have been few studies on the ecology of IAA-degrading bacteria. In this study, among eight endophytic bacterial strains previously isolated from the same sweet potato sample including two IAA producers, Klebsiella sp. Sal 1 and Enterobacter sp. Sal 3, all of the strains showed IAA-degrading ability to some extent. Herbaspirillum sp. Sal 6 had the highest activity for IAA and tryptophan. When the IAA producers and the degrader were co-cultured in tryptophan-amended N+MR liquid medium, the concentrations of IAA decreased. Inoculation with Klebsiella sp. Sal 1, the highest IAA producer among the test strains, increased fresh root weight of tomato and radish, but the effect decreased by co-inoculation with IAA-degrading Herbaspirillum sp. Sal 6. Since both strains colonized plant parts at high populations, it was likely that the IAA degrader decreased IAA levels in the plants by degrading IAA and/or its precursor tryptophan. When IAA-producing biofertilizers are used, interactions with IAA degraders in plants should be considered.
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Claims 5
Claim · model-written summary
Klebsiella sp. Sal 1 inoculation increased tomato fresh root weight.
- Taxon
- tomato
Solanum lycopersicume0 - Treatment
- Inoculation with Klebsiella sp. Sal 1e0
- Interactor
- Klebsiella sp. Sal 1e0symbiont
- Outcome
- fresh root weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with Klebsiella sp. Sal 1, the highest IAA producer among the test strains, increased fresh root weight of tomato and radish”
Claim · model-written summary
Klebsiella sp. Sal 1 inoculation increased radish fresh root weight.
- Taxon
- radish
Raphanus sativuse0 - Treatment
- Inoculation with Klebsiella sp. Sal 1e0
- Interactor
- Klebsiella sp. Sal 1e0symbiont
- Outcome
- fresh root weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with Klebsiella sp. Sal 1, the highest IAA producer among the test strains, increased fresh root weight of tomato and radish”
Claim · model-written summary
Co-inoculation with Herbaspirillum sp. Sal 6 diminished the root weight effect in tomato and radish.
- Taxon
- tomato and radishRaphanus sativusSolanum lycopersicume1
- Treatment
- co-inoculation with IAA-degrading Herbaspirillum sp. Sal 6e0
- Interactor
- Herbaspirillum sp. Sal 6e0symbiont
- Outcome
- fresh root weighte1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but the effect decreased by co-inoculation with IAA-degrading Herbaspirillum sp. Sal 6”
e1“fresh root weight of tomato and radish”
Claim · model-written summary
The two bacterial strains colonized plant parts at high populations.
- Taxon
- tomato and radishRaphanus sativusSolanum lycopersicume1
- Interactor
- both strainse0symbiont
- Outcome
- colonized plant parts at high populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both strains colonized plant parts at high populations”
e1“tomato and radish”
Claim · model-written summary
The authors recommend considering interactions with IAA degraders when using IAA-producing biofertilizers.
- Taxon
- tomato and radishRaphanus sativusSolanum lycopersicume1
- Outcome
- interactions with IAA degraders in plants should be considerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When IAA-producing biofertilizers are used, interactions with IAA degraders in plants should be considered”
e1“tomato and radish”
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