Screening of effective biocontrol agents against postharvest litchi downy blight caused by Peronophythora litchii

Situ, Junjian; Zheng, Li; Xu, Dandan; Gu, Changzhi; Xi, Pinggen; Deng, Yuewen; Hsiang, Tom; Jiang, Zide

doi:10.1016/j.postharvbio.2023.112249

Cited by 9 publications

(3 citation statements)

References 49 publications

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“…Since members of Sinomonas have been detected in agricultural soils and were potentially beneficial to plant nutrition and health, the antagonistic activity against P. litchii and inhibitory activity to sporangia germination of JGH33 T and the four closely related type species were tested in this study [41]. Briefly, fresh culture of each strain were collected and adjusted to OD 600 =1 with sterile water.…”

Section: Physiology and Chemotaxonomymentioning

confidence: 99%

Sinomonas terricola sp. nov., a plant-beneficial bacterium isolated from litchi rhizosphere soil in Guangdong, China

Wan,

Zhou,

Sun

et al. 2024

International Journal of Systematic and Evolutionary Microbiology

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A novel plant-beneficial bacterium strain, designated as JGH33T, which inhibited Peronophythora litchii sporangia germination, was isolated on Reasoner's 2A medium from a litchi rhizosphere soil sample collected in Gaozhou City, Guangdong Province, PR China. Cells of strain JGH33T were Gram-stain-positive, aerobic, non-motile, bent rods. The strain grew optimally at 30–37 °C and pH 6.0–8.0. Sequence similarity analysis based on 16S rRNA genes indicated that strain JGH33T exhibited highest sequence similarity to Sinomonas albida LC13T (99.2 %). The genomic DNA G+C content of the isolate was 69.1 mol%. The genome of JGH33T was 4.7 Mbp in size with the average nucleotide identity value of 83.45 % to the most related reference strains, which is lower than the species delineation threshold of 95 %. The digital DNA–DNA hybridization of the isolate resulted in a relatedness value of 24.9 % with its closest neighbour. The predominant respiratory quinone of JGH33T was MK-9(H2). The major fatty acids were C15 : 0 anteiso (43.4 %), C16 : 0 iso (19.1 %) and C17 : 0 anteiso (19.3 %), and the featured component was C18 : 3 ω6c (1.01 %). The polar lipid composition of strain JGH33T included diphosphatidylglycerol, phosphatidylglycerol, dimannosylglyceride, phosphatidylinositol and glycolipids. On the basis of polyphasic taxonomy analyses data, strain JGH33T represents a novel species of the genus Sinomonas, for which the name Sinomonas terricola sp. nov. is proposed, with JGH33T (=JCM 35868T=GDMCC 1.3730T) as the type strain.

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Section: Physiology and Chemotaxonomymentioning

confidence: 99%

Sinomonas terricola sp. nov., a plant-beneficial bacterium isolated from litchi rhizosphere soil in Guangdong, China

Wan,

Zhou,

Sun

et al. 2024

International Journal of Systematic and Evolutionary Microbiology

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“…Understanding the niche requirements of both the BCA and the target pest is therefore essential for successful biocontrol [131]. Competition for nutrients and niches can be an important factor in determining the success of a BCA.…”

Section: Competition For Nutrient and Nichesmentioning

confidence: 99%

Bacterial Bioprotectants: Biocontrol Traits and Induced Resistance to Phytopathogens

Egamberdieva

Eshboev

Shukurov

et al. 2023

Microbiology Research

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Plant growth and nutrition are adversely affected by various factors such as water stress, high temperature, and plant pathogens. Plant-associated microbes play a vital role in the growth and development of their hosts under biotic and abiotic stresses. The use of a rhizosphere microbiome for plant growth stimulation and the biological control of fungal disease can lead to improved crop productivity. Mechanisms used by plant-growth-promoting rhizobacteria (PGPR) to protect plants from soilborne pathogens include antibiosis, the production of lytic enzymes, indole-3 acetic acid production, decreasing ethylene levels by secreting 1-aminocyclopropane-1-carboxylate deaminase, competition for nutrients and niches, parasitism and induced systemic resistance. In this review, we emphasize the biological control of plant pathogens by root-associated microbes and discuss traits involved in pathogen reduction. Future research should focus on the effect of root exudation on plant–pathogen interactions under various abiotic factors. Moreover, the development of microbial fungicides with longer shelf lives will help farmers to opt for organic agriculture, reducing the use of chemical fertilizers. This trend is expected to drive the adoption of biological control methods in agriculture. The future prospects for the biological control of plant diseases are bright and are expected to play an increasingly important role in sustainable agriculture.

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“…Peronophythora litchii , the causal agent of litchi downy blight, is a highly destructive disease that affects litchi trees during their growth and developmental stages. This disease is widely distributed in litchi-growing regions and leads to the decay of nascent leaves, blossoms, and fruits [ 2 ]. Moreover, litchi downy blight is the primary postharvest disease of litchi, resulting in significant damage to the fruit and a significant reduction in its shelf life.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Volatiles Emitted by Streptomyces abikoensis TJGA-19 for Managing Litchi Downy Blight Disease

Xing,

Sun,

Liu

et al. 2024

Microorganisms

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Litchi is a fruit of significant commercial value; however, its quality and yield are hindered by downy blight disease caused by Peronophythora litchii. In this study, volatile organic compounds (VOCs) from Streptomyces abikoensis TJGA-19 were investigated for their antifungal effects and studied in vitro and in planta for the suppression of litchi downy blight disease in litchi leaves and fruits. The growth of P. litchii was inhibited by VOCs produced by TJGA-19 cultivated on autoclaved wheat seeds for durations of 10, 20, or 30 days. Volatiles from 20-day-old cultures were more active in inhibition effect against P. litchii than those from 10- or 30-day-old cultures. These volatiles inhibit the growth of mycelia, sporulation, and oospore production, without any significant effect on sporangia germination. Additionally, the VOCs were effective in suppressing disease severity in detached litchi leaf and fruit infection assays. With the increase in the weight of the wheat seed culture of S.abikoensis TJGA-19, the diameters of disease spots on leaves, as well as the incidence rate and disease indices on fruits, decreased significantly. Microscopic results from SEM and TEM investigations showed abnormal morphology of sporangia, mycelia, and sporangiophores, as well as organelle damage in P. litchii caused by VOCs of TJGA-19. Spectroscopic analysis revealed the identification of 22 VOCs produced by TJGA-19, among which the most dominant compound was 2-Methyliborneol. These findings indicated the significant role of TJGA-19 compounds in the control of litchi downy blight disease and in improving fruit quality.

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Screening of effective biocontrol agents against postharvest litchi downy blight caused by Peronophythora litchii

Cited by 9 publications

References 49 publications

Sinomonas terricola sp. nov., a plant-beneficial bacterium isolated from litchi rhizosphere soil in Guangdong, China

Sinomonas terricola sp. nov., a plant-beneficial bacterium isolated from litchi rhizosphere soil in Guangdong, China

Bacterial Bioprotectants: Biocontrol Traits and Induced Resistance to Phytopathogens

Effectiveness of Volatiles Emitted by Streptomyces abikoensis TJGA-19 for Managing Litchi Downy Blight Disease

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