Bacterial endophyte Sphingomonas sp. LK11 produces gibberellins and IAA and promotes tomato plant growth

Khan, Abdul Latif; Waqas, Muhammad; Kang, ⋅Sang-Mo; Al‐Harrasi, Ahmed; Hussain, Javid; Al‐Rawahi, Ahmed; Al-Khiziri, Salima; Ullah, Ihsan; Ali, Liaqat; Jung, Hee‐Young; Lee, In‐Jung

doi:10.1007/s12275-014-4002-7

Cited by 392 publications

(231 citation statements)

References 47 publications

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“…(11.23 ± 0. 93 μM/ml), an endophyte isolated from the leaves of Tephrosia apollinea, should be linked to the increases of surface area and root length, the loss of cell wall and the release of exudates in tomato (Solanum lycopersicum L.) plants [38]. It is known that root hair initiation and elongation are among the best characterized auxin-associated phenotypes [39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Plant growth-promoting effects of rhizospheric and endophytic bacteria associated with different tomato cultivars and new tomato hybrids

Abbamondi

Tommonaro

Weyens

et al. 2016

Chem. Biol. Technol. Agric.

108

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Background: Conventional agriculture relies on chemical pesticides and fertilizers, which can degrade ecosystems. A reduction of these harmful practices is required, replacing (or integrating) them with more eco-friendly approaches, such as microbial inoculation. Tomato is an important agricultural product, with a high content of bioactive compounds (folate, ascorbate, polyphenols, and carotenoids). The focus of this research was to investigate the plant growth-promoting (PGP) abilities of bacterial strains isolated from different tomato cultivars, with the aim to develop systems to improve plant health and crop productivity based on microbial inoculation. Methods:A pool of different tomato cultivars already available on the market and new tomato hybrids were selected based on their nutritional quality (high content of biologically active compounds). A total of 23 strains were isolated from tomato roots (11 rhizospheric strains and 12 root endophytes). The cultivable isolates were analyzed for a number of different PGP traits: organic acids (OA), indole acetic acid (IAA), ACC deaminase, and siderophore production. The effects of microbial inoculation on root growth of Arabidopsis thaliana were also evaluated using a Vertical Agar Plate assay. Results:A high percentage of the isolated strains tested positive for the following PGP traits: 73 % were able to produce OA, 89 % IAA, 83 % ACC deaminase, and 87 % siderophores. The most striking result were remarkable increases in the formation of root hairs for most of the inoculated plants. This effect was obvious for all A. thaliana seedlings inoculated with the isolated endophytes, and for the 50 % of the seedlings inoculated with the rhizospheric strains.

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Section: Discussionmentioning

confidence: 99%

Plant growth-promoting effects of rhizospheric and endophytic bacteria associated with different tomato cultivars and new tomato hybrids

Abbamondi

Tommonaro

Weyens

et al. 2016

Chem. Biol. Technol. Agric.

108

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“…Tomato plants inoculated with Sphingomonas sp. LK11 were compared to controls grown in sterilized horticulture media supplemented with water or nutrient broth (Khan et al, 2014). LK11 was originally isolated from Tephrosia appolinea-a dryland legume studied for its wide range of secondary metabolites.…”

Section: Hypothesis 5: Microbial Diversity Will Increase Overall Planmentioning

confidence: 99%

The Green Roof Microbiome: Improving Plant Survival for Ecosystem Service Delivery

et al. 2018

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Plants are key contributors to ecosystem services delivered by green roofs in cities including stormwater capture, temperature regulation, and wildlife habitat. As a result, current research has primarily focused on their growth in relationship to extensive green roof (e.g., substrates <15 cm depth) ecosystem services. Green roofs are exposed to a variety of harsh abiotic factors such as intense solar radiation, wind, and isolation from ground-level habitats, making survival exceedingly difficult. Plants in natural habitats benefit from a variety of interactions with fungi and bacteria. These plant-microbial interactions improve mechanisms of survival and productivity; however, many green roof substrates are sterilized prior to installation and lack microbial communities with unstudied consequences for green roof plant health and subsequent survival and performance. In this paper, we present six hypotheses on the positive role of microbes in green roof applications. In natural and experimental systems, microbial interactions have been linked to plant (1) drought tolerance, (2) pathogen protection, (3) nutrient availability, (4) salt tolerance, (5) phytohormone production, and (6) substrate stabilization, all of which are desirable properties of green roof ecosystems. As few studies exist that directly examine these relationships on green roofs, we explore the existing ecological literature on these topics to unravel the mechanisms that could support more complex green roof ecosystem and lead to new insight into the design, performance, and broader applications in green infrastructure.

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“…are known to produce the phytohormones such as gibberellin and indole acetic acid. 45) S. maltophilia and Pantoea spp. are known to be nitrogen-fixing bacteria.…”

Section: Soybeanmentioning

confidence: 99%

Development of LNA oligonucleotide–PCR clamping technique in investigating the community structures of plant-associated bacteria

Ikenaga

Tabuchi

Oyama

et al. 2015

Bioscience, Biotechnology, and Biochemistry

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Simultaneous extraction of plant organelle (mitochondria and plastid) genes during the DNA extraction step is major limitation in investigating the community structures of plant-associated bacteria. Although locked nucleic acid (LNA) oligonucleotides was designed to selectively amplify the bacterial small subunit rRNA genes by applying the PCR clamping technique, those for plastids were applicable only for particular plants, while those for mitochondria were available throughout most plants. To widen the applicable range, new LNA oligonucleotides specific for plastids were designed, and the efficacy was investigated. PCR without LNA oligonucleotides predominantly amplified the organelle genes, while bacterial genes were predominantly observed in having applied the LNA oligonucleotides. Denaturing gradient gel electrophoresis (DGGE) analysis displayed additional bacterial DGGE bands, the amplicons of which were prepared using the LNA oligonucleotides. Thus, new designed LNA oligonucleotides specific for plastids were effective and have widened the scope in investigating the community structures of plant-associated bacteria.

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Bacterial endophyte Sphingomonas sp. LK11 produces gibberellins and IAA and promotes tomato plant growth

Cited by 392 publications

References 47 publications

Plant growth-promoting effects of rhizospheric and endophytic bacteria associated with different tomato cultivars and new tomato hybrids

Plant growth-promoting effects of rhizospheric and endophytic bacteria associated with different tomato cultivars and new tomato hybrids

The Green Roof Microbiome: Improving Plant Survival for Ecosystem Service Delivery

Development of LNA oligonucleotide–PCR clamping technique in investigating the community structures of plant-associated bacteria

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