Exploring actinomycetes and endophytes of rice ecosystem for induction of disease resistance against bacterial blight of rice

Saikia, Kakumoni; Bora, L. C.

doi:10.1007/s10658-020-02141-3

Cited by 14 publications

(7 citation statements)

References 38 publications

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“…The in planta biocontrol was tested by combining the most efficient isolates; this strategy was in line with literature evidence supporting the use of microbial consortia for the control of microbial phytopathogens [8,[55][56][57][58]. The efficacy of in planta biocontrol shown by the consortium of S. albidoflavus H12 and N. aegyptica H14 can be ascribed not only to the activities mentioned above, but also to other indirect mechanisms.…”

Section: Discussionmentioning

confidence: 73%

Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity

et al. 2021

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Biotic stress caused by pathogenic microorganisms leads to damage in crops. Tomato and carrot are among the most important vegetables cultivated worldwide. These plants are attacked by several pathogens, affecting their growth and productivity. Fourteen plant growth-promoting actinomycetes (PGPA) were screened for their in vitro biocontrol activity against Solanum lycopersicum and Daucus carota microbial phytopathogens. Their antifungal activity was evaluated against Fusarium oxysporum f. sp. radicis-lycopersici (FORL) and Rhizoctonia solani (RHS). Antibacterial activity was evaluated against Pseudomonas syringae, Pseudomonas corrugata, Pseudomonas syringae pv. actinidiae, and Pectobacterium carotovorum subsp. carotovorum. Strains that showed good in vitro results were further investigated in vitro (cell-free supernatants activity, scanning electron microscope observations of fungal inhibition). The consortium of the most active PGPA was then utilized as biocontrol agents in planta experiments on S. lycopersicum and D. carota. The Streptomyces albidoflavus H12 and Nocardiopsis aegyptica H14 strains showed the best in vitro biocontrol activities. The diffusible and volatile compounds and cell-free supernatants of these strains showed both antifungal (in vitro inhibition up to 85%, hyphal desegregation and fungicidal properties) and antibacterial activity (in vitro inhibition >25 mm and bactericidal properties). Their consortium was also able to counteract the infection symptoms of microbial phytopathogens during in planta experiments, improving plant status. The results obtained highlight the efficacy of the selected actinomycetes strains as biocontrol agents of S. lycopersicum and D. carota.

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Section: Discussionmentioning

confidence: 73%

Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity

et al. 2021

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“…4B). In the recent past, several rice endophytes were reported as antagonists against Xoo, which include Pseudomonas putida, and Metarrhizium anisophile (Saikia and Bora 2021), Azospirillum (Yasuda et al,2009), Paenibacillus polymyxa (Choi et al,2022). The antagonists against Rhizoctonia reported were Bacillus subtilis, B. nakamurai (Wang et al,2022), and Lysinibacillus sphaericus (Shabanamol et al,2021).…”

Section: Biocontrol Activitymentioning

confidence: 99%

Drought-Tolerant Landrace Rice Norungan Harbors Novel Putative Competitive Endophytes

Nunna¹,

Balachandar²

2022

MAJ

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The landraces and wild species wisely choose their microbiome and explored them as a second genome for nutrient acquisition from the limited resources of the soil ecosystem and can withstand drought and diseases. Hence, the present study aimed to explore the drought-tolerant rice landrace of Tamil Nadu for the putative competitive endophytes to develop a plant-growth-promoting endophytic bacterial inoculant. Twenty two putative competitive endophytes were authenticated from plant tissues and seeds of Norungan. The 16S rRNA gene sequencing revealed that Norungan rice was colonized predominantly by Firmicutes, including six species of Bacillus, four species of Priestia, and one species each of Micrococcus, Geobacillus, and Lysinibacillus, along with two Proteobacteria, Enterobacter cloacae and Kosakonia oryzae. These endophytes were screened for nutrient transformation, growth hormone production, drought mitigation, and antagonism against plant pathogens. Bacillus cereus NE07, B. paralicheniformis NE18, B. subtilis NE20, and Priestia flexa NE09 showed potential nutrient-transforming capability, while Bacillus cereus NE07 and Priestia flexa NE09 showed high plant growth hormones (indole-3-acetic acid and gibberellic acid production). Similarly, Bacillus cereus NE07 and Priestia endophytica (NE14) showed high ACC deaminase, proline accumulation, biofilm production, and potential candidates for drought mitigation. Bacillus hayneshii NE04 and Priestia aryabhattai NE10, and Bacillus cereus NE07 showed antagonism against fungal pathogen Rhizoctonia solani and bacterial leaf blight causing Xanthomonas oryzae. The results confirmed that no single strain with all plant-growth-promoting and stress-mitigating traits found in Norungan, and these strains were performed division of labor basis. Hence, developing a putative competitive endophytic bacterial consortium with compatible strains representing cumulative beneficial traits as inoculants would be a novel approach for improving rice productivity

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“…2) and indicate that rice is equipped with multiple blast resistance mechanisms. Several studies on endophyteand other PGP microbe-conferred disease resistance through induction of ISR in rice, have focused on defence-related enzymes (phenylalanine ammonia-lyase, peroxidase and polyphenol oxidase) and total phenol content (Jha and Subramanian 2011;Nagendran et al 2014;Rangjaroen et al 2019;Jain et al 2020;Saikia and Bora 2020). The production of these enzymes and phenolsby consortia of these microbes induced better disease resistance than when they are applied individually (Jain et al 2020;Saikia and Bora 2020) and endophytic bacteria perform better than rhizobacteria in defending rice (Jha and Subramanian 2011).…”

Section: Endophyte Induced Systemic Resistance (Isr)mentioning

confidence: 99%

“…Several studies on endophyteand other PGP microbe-conferred disease resistance through induction of ISR in rice, have focused on defence-related enzymes (phenylalanine ammonia-lyase, peroxidase and polyphenol oxidase) and total phenol content (Jha and Subramanian 2011;Nagendran et al 2014;Rangjaroen et al 2019;Jain et al 2020;Saikia and Bora 2020). The production of these enzymes and phenolsby consortia of these microbes induced better disease resistance than when they are applied individually (Jain et al 2020;Saikia and Bora 2020) and endophytic bacteria perform better than rhizobacteria in defending rice (Jha and Subramanian 2011). Further, the complex genetic environment and the quality (determined by carbon, nitrogen, and defensive compounds) of the host plant are crucial factors affecting the fecundity potential and the reproductive success of herbivore insects (Awmack and Leather 2002;Kliebenstein 2018).…”

Section: Endophyte Induced Systemic Resistance (Isr)mentioning

confidence: 99%

The influence of endophytes on rice fitness under environmental stresses

2021

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Key Message Endophytes are crucial for the promotion of rice growth and stress tolerance and can be used to increase rice crop yield. Endophytes can thus be exploited in biotechnology and genetic engineering as eco-friendly and cost-effective means for the development of high-yielding and stress-tolerant rice plants. Abstract Rice (Oryza sativa) crop is continuously subjected to biotic and abiotic stresses, compromising growth and consequently yield. The situation is exacerbated by climate change impacting on ecosystems and biodiversity. Genetic engineering has been used to develop stress-tolerant rice, alongside physical and chemical methods to mitigate the effect of these stresses. However, the success of these strategies has been hindered by short-lived field success and public concern on adverse effects associated. The limited success in the field of stress-tolerant cultivars developed through breeding or transgenic approaches is due to the complex nature of stress tolerance as well as to the resistance breakdown caused by accelerated evolution of pathogens. It is therefore necessary to develop novel and acceptable strategies to enhance rice stress tolerance and durable resistance and consequently improve yield. In the last decade, plant growth promoting (PGP) microbes, especially endophytes, have drawn the attention of agricultural scientists worldwide, due to their ability to mitigate environmental stresses in crops, without causing adverse effects. Increasing evidence indicates that endophytes effectively confer fitness benefits also to rice under biotic and abiotic stress conditions. Endophyte-produced metabolites can control the expression of stress-responsive genes and improve the physiological performance and growth of rice plants. This review highlights the current evidence available for PGP microbe-promoted tolerance of rice to abiotic stresses such as salinity and drought and to biotic ones, with special emphasis on endophytes. Associated molecular mechanisms are illustrated, and prospects for sustainable rice production also in the light of the impending climate change, discussed.

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Exploring actinomycetes and endophytes of rice ecosystem for induction of disease resistance against bacterial blight of rice

Cited by 14 publications

References 38 publications

Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity

Biocontrol of Soil-Borne Pathogens of Solanum lycopersicum L. and Daucus carota L. by Plant Growth-Promoting Actinomycetes: In Vitro and In Planta Antagonistic Activity

Drought-Tolerant Landrace Rice Norungan Harbors Novel Putative Competitive Endophytes

The influence of endophytes on rice fitness under environmental stresses

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