Journal
RSC ADVANCES
Volume 11, Issue 50, Pages 31601-31607Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra05659j
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Funding
- Leading Talent Echelon Backup Leaders Project of Heilongjiang Province, China (First-class Fund of Innovative R D)
- Postdoctoral Scientific Research Start-up-Fund of Heilongjiang Province, China [LBH-Q19053]
- Key Program of Natural Science Foundation of Heilongjiang Province, China [JJ2020ZD0111]
- Major Science and Technology Program of Millions Project in Heilongjiang Province, China [2019ZX16B01]
- Young Scientist Training Project of Heilongjiang Academy of Agricultural Sciences (2021)
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The study found that Enterobacter sp. strains have high IAA production capability and synthesize IAA through the indole-3-pyruvic acid pathway. The IAA product of these microbes promotes the growth of maize.
Indole-3-acetic acid (IAA) plays an important role in the growth and development of plants. In this study, a series of predominant strains were isolated and identified as Enterobacter sp. with remarkable IAA-producing capabilities. The IAA-producing strains are mainly tryptophan-dependent and have significantly high yields of IAA (3477 mu g mL(-1) and 3378 mu g mL(-1)). The ipdC gene encoding indole-3-pyruvate decarboxylase was identified by genomic analysis and RT-qPCR analysis, indicating the involvement of the indole-3-pyruvic acid (IPyA) pathway of IAA biosynthesis. The IPyA pathway was also confirmed by the intermediate assay. The IAA product of microbial metabolites was isolated, purified and characterized. These microbes exhibiting IAA production significantly promoted the growth of maize, increasing root length, plant height, fresh weight and dry weight. Thus, Enterobacter sp. with high IAA production has great prospects in agricultural and industrial applications.
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