Plant growth-promotion by Streptomyces spp. in sorghum (Sorghum bicolor L.)

Alekhya, G; Gopalakrishnan, Subramaniam

doi:10.5897/ajb2016.15423

Cited by 6 publications

(4 citation statements)

References 45 publications

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“…Though the Bacillus strains were compatible with each other in vitro, their performance during co-inoculation on plants may vary. The results obtained under greenhouse study corroborated with previous reports of Alekhya and Gopalakrishnan [31], where Streptomyces spp. promoted the plant growth of sorghum.…”

Section: Discussionsupporting

confidence: 91%

“…These root tips were fixed in 2% glutaraldehyde-phosphate buffered saline overnight at 4 • C and postfixed in osmium tetroxide. Processed roots were coated with a gold layer using a sputter coater and scanned under a scanning electron microscope (SEM) (Hitachi S-3700N) at the University College of Technology, Osmania University, Hyderabad [31].…”

Section: Root Colonization By Bacillus Sppmentioning

confidence: 99%

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Co-Inoculation of Bacillus spp. for Growth Promotion and Iron Fortification in Sorghum

et al. 2021

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Seven Bacillus spp. isolated from the marine water and the rhizosphere of the medicinal plant Coscinium fenestratum were studied to produce plant growth promotion (PGP) traits invitro. Among the seven isolates, MMRH22 and RHPR20 produced copious amounts of PGP traits. Based on the 16S rRNA sequence, the two potent bacterial isolates, RHPR20 and MMRH22, were identified as Bacillus mojavensis and Bacillus cereus, respectively. A compatibility test between the isolates RHPR20 and MMRH22 revealed they are compatible and can be used as a consortium. Both isolates were evaluated for the plant growth promotion and the biofortification of sorghum under greenhouse conditions. Treatments included the application of MMRH22, RHPR20, their consortium (RHPR20 + MMRH22), and an uninoculated control. Inoculation with bacterial cultures resulted in a significant increase in the plant height; the number of leaves; the leaf area; the root, shoot, and leaf weight; and the yield of sorghum at 30 and 60 days after sowing (DAS). The scanning electron micrograph of the sorghum plant roots revealed extensive colonization in the plants treated with the bacterial cultures compared to the uninoculated control. The sorghum grains obtained after final harvest were analyzed for their nutrient content by ICP–OES. The biofortification in sorghum grains was varied and was found to enhance the iron content up to 97%. This study revealed that treatments with microbial consortia enhance plant growth, yield, and iron content, which could combat nutrient deficiencies in plants and humans.

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Section: Discussionsupporting

confidence: 91%

Section: Root Colonization By Bacillus Sppmentioning

confidence: 99%

Co-Inoculation of Bacillus spp. for Growth Promotion and Iron Fortification in Sorghum

et al. 2021

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“…comparatively high abundances in the sorghum rhizosphere (27). And Streptomyces have been shown to be active in promoting the growth of many crop plants (28) including sorghum (29,30).…”

Section: Discussionmentioning

confidence: 99%

Sorgoleone degradation by sorghum-associated bacteria; an opportunity for enforcing plant growth promotion

Oda¹,

Elmore

Nelson

et al. 2023

Preprint

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Metabolite exchange between plant roots and their associated rhizosphere microbiomes underpins plant growth promotion by microbes. Sorghum bicolor is a cereal crop that feeds animals and humans and is used for bioethanol production. Its root tips exude large amounts of a lipophilic benzoquinone called sorgoleone. Sorgoleone is an allelochemical that suppresses the growth of competing plant seedlings and is mineralized by microbes in soil. As an avenue to understand how sorghum and its root microbiome may be connected through root exudates, we identified the molecular determinants of microbial sorgoleone degradation and the distribution of this trait among microbes. We isolated and studied from sorghum-associated soils, three bacterial strains classified as Acinetobacter, Burkholderia, and Pseudomonas species that grow with sorgoleone as a sole carbon and energy source. The genomes of these strains were sequenced and subjected to transcriptomic and gene fitness analyses to identify candidate sorgoleone degradation genes. Follow up mutational analysis showed that sorgoleone catabolism is dependent on four contiguous genes that are conserved among the species we sequenced. Phylogenetic analysis of the sorgoleone degradation gene cluster showed that sorgoleone catabolism is enriched in sorghum-associated Streptomyces strains. The discovery of bacteria that grow on a compound like sorgoleone that is plant specific and not widely distributed in the environment, provides an opportunity to study how a plant exudate can enforce the development of a rhizosphere specific microbiome for the mutual benefit of plant and microbe.

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“…Amycolatopsis sp. BCA-696 isolates exhibited a broad spectrum of plant growth-promoting attributes and increased the yield in chickpea and sorghum (Gottumukkala et al 2016), Ratchanee et al (2014) reported that Streptomyces and non Streptomyces such as Amycolatopsis, Micromonospora, Microbispora, and Nanomuraea revealed antagonistic potential against Xnthomonas campestris pv. glycines.…”

Section: Introductionmentioning

confidence: 99%

Formulation-based antagonistic endophyte Amycolatopsis sp. SND-1 triggers defense response in Vigna radiata (L.) R. Wilczek. (Mung bean) against Cercospora leaf spot disease

2023

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In the present work, Amycolatopsis sp. SND-1 (SND-1) was isolated from Cleome chellidonii Linn. (C. chellidonii) was performed as biocontrol and resistance elicitor in Vigna radiata (L.) R. Wilczek (mung bean) plants against Cercospora leaf spot causing pathogen Cercospora canescens (C. canescens). The SND-1 isolate showed 74% of inhibition against C. canescens in dual culture and in-vitro plant growth trials exhibited production of indole acetic acid, gibberellic acid, cytokinin, ammonia, hydrogen cyanide, and siderophore and phosphate solubilization. In-vivo study with talcum formulation of SND-1 revealed a signi cant increase in plant root length, shoots length, root and shoot fresh weight, and reduced the disease severity in treated mung bean plants. Triggering of resistance by SND-1 formulation was studied by histochemical depositions and biochemical defense enzymes resulted that the acceleration in defense response in comparison with control plants. The bioactive endophytic Amycolatopsis sp. SND-1 enhanced the defense against C. canescens infection; hence it can be used as a biological control agent in mung bean cultivars.

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Plant growth-promotion by Streptomyces spp. in sorghum (Sorghum bicolor L.)

Cited by 6 publications

References 45 publications

Co-Inoculation of Bacillus spp. for Growth Promotion and Iron Fortification in Sorghum

Co-Inoculation of Bacillus spp. for Growth Promotion and Iron Fortification in Sorghum

Sorgoleone degradation by sorghum-associated bacteria; an opportunity for enforcing plant growth promotion

Formulation-based antagonistic endophyte Amycolatopsis sp. SND-1 triggers defense response in Vigna radiata (L.) R. Wilczek. (Mung bean) against Cercospora leaf spot disease

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