Effects of actinobacteria on plant disease suppression and growth promotion

Palaniyandi, Sasikumar Arunachalam; Yang, Seung Hwan; Zhang, Lixin; Suh, Joo‐Won

doi:10.1007/s00253-013-5206-1

Cited by 344 publications

(220 citation statements)

References 139 publications

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“…Recent studies underline the importance of the microbial metabolism and host interaction for growth, quality, and health of edible and medicinal plants [17][18][19]. The bacterial community composition of tomato plants and the influence of inoculation of rhizobacteria on plant health is also a topic of increasing scientific interest [20][21][22][23].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…농작물의 질병은 화학농약을 사용하거나 육종 이나 유전공학적 방법을 통하여 스트레스 저항성 품종을 개발 함으로써 통제할 수 있다. 이러한 전략을 "good agricultural practice"라고 하며, 지속가능한 농업 생산성 향상에 크게 기여 하고 있다 [18].…”

Section: 서 론unclassified

Isolation and Characterization of Bacillus Strain as a Potential Biocontrol Agent

이예람¹,

이상미²,

장은영³

et al. 2015

Journal of Life Science

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In this study, to retain a stable bacterial inoculant, Bacillus strains showing antifungal activity were screened. The improved production, antifungal mechanism, and stability of the antifungal metabolite by a selected strain, AF4, a potent antagonist against phytopathogenic Botrytis cinerea, were also investigated. The AF4 strain was isolated from rhizospheric soil of hot pepper and identified as Bacillus subtilis by phenotypic characters and 16S rRNA gene analysis. Strain AF4 did not produce antifungal activity in the absence of a nitrogen source and produced antifungal activity at a broad range of temperatures (25-40°C) and pH (7-10). Optimal carbon and nitrogen sources for the production of antifungal activity were glycerol and casein, respectively. Under improved conditions, the maximum antifungal activity was 140±3 AU/ml, which was higher than in the basal medium. Photomicrographs of strain AF4-treated B. cinerea showed morphological abnormalities of fungal mycelia, demonstrating the role of the antifungal metabolite. The B. subtilis AF4 culture exhibited broad antifungal activity against several phytopathogenic fungi. The antifungal activity was heat-, pH-, solvent-, and protease-stable, indicating its nonproteinous nature. These results suggest that B. subtilis AF4 is a potential candidate for the control of phytopathogenic fungi-derived plant diseases.

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“…In addition, actinomycetes synthesize an array of biodegradative enzymes which includes chitinases (Blaak et al 1993;Gupta et al 1995;Pattanapipitpaisal and Kamlandharn 2012;Sowmya et al 2012), glucanases (Hopwood 1990;Damude et al 1993;Mahadevan and Crawford 1996;Harchand and Singh 1997;Thomas and Crawford 1998;Trejo-Estrada et al 1998;Fayad et al 2001;Huiling et al 2014), peroxidases (Ramachandra et al 1988;Djamila et al 2011), and other enzymes possibly involved in mycoparasitic activity. Considering the potential role of actinomycetes in the management of plant diseases and plant growth promotion by certain other mechanisms, actinomycetes in recent times are considered as one of the important aspects in sustainable plant production (Palaniyandi et al 2013) as presented in Table 6.2. The root-colonizing soil actinomycetes S. lydicus WYEC108, for instance, have been reported to influence pea root nodulation and increase the nodulation frequency possibly at the level of infection by Rhizobium spp.…”

Section: Actinomycetes As a Potential Candidate For Increased Plant Gmentioning

confidence: 99%

Role of Phosphate-Solubilizing Actinomycetes in Plant Growth Promotion: Current Perspective

Saif

Khan

Zaidi

et al. 2014

Phosphate Solubilizing Microorganisms

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Phosphorus (P), an essential plant nutrient, is a nonrenewable resource whose availability depends exclusively on mined rock phosphates. Deficiency of P in soil results in reduction in food production since all plants require an adequate supply of P for its growth and development. Even though synthetic phosphatic fertilizer has played some major roles in enhancing crop production, its excessive use has also dark sides to it where it has been found to damage the environment, destruct soil fertility, and, via food chain, seriously affect the human health. Considering the nuisance of overuse of P, there is an urgent demand by the agriculture practitioners to find nonhazardous strategy that can overcome/reduce the use of agrochemicals in agricultural practices and, hence, may preserve the very integrity of soil ecosystems. In this context, actinobacteria, a group of Grampositive bacteria, ubiquitous in soils, are likely to play some important roles in supplying soluble P to plants by solubilizing/mineralizing complex P resources of soils. Additionally, the extracellular metabolites produced by actinomycetes may inhibit phytopathogens and, sometimes such metabolic compounds may also act as plant growth regulators. These qualities, among others, make actinobacteria an ideal candidate for developing as microbial inoculants for ultimate use in agriculture production system. The potential roles of actinomycetes as phosphate solubilizers in enhancing crop production are discussed.

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Effects of actinobacteria on plant disease suppression and growth promotion

Cited by 344 publications

References 139 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

Isolation and Characterization of Bacillus Strain as a Potential Biocontrol Agent

Role of Phosphate-Solubilizing Actinomycetes in Plant Growth Promotion: Current Perspective

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