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Biocontrol bacteria in Serbian soil

ABSTRACT: Genomes of strains from the wheat rhizospheres as biocontrol agents against F. graminearum

PROVIDER: PRJEB59762 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR11180410_1.fastq.gz	Fastqsanger.gz
	ERR11180410_2.fastq.gz	Fastqsanger.gz
	ERR11180411_1.fastq.gz	Fastqsanger.gz
	ERR11180411_2.fastq.gz	Fastqsanger.gz

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Project description:We identified the long non-coding RNAs (lncRNAs) in Triticum aestivum infected with Fusarium graminearum by high-throughput RNA sequencing. More than 393 million clean reads were obtained from Illumina Hiseq 4000 system and 126,391 transcripts was identified as high-confidence lncRNAs in T. aestivum against F. graminearum by an integrated approach. Already well over 4,130 of the total 4,276 differentially expressed lncRNAs were specifically expressed at 12 h post-inoculation (hpi), but only 89 of these were specifically expressed at 24 hpi, indicating that the initial stage was the crucial stage for lncRNA-mediated gene regulation of wheat defense against F. graminearum. Target analysis showed the lncRNAs participated in various biological stress processes.

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Fumarylacetoacetate hydrolase targeted by a Fusarium graminearum effector positively regulates wheat FHB resistance and yield and promotes heading

Project description:Fusarium head blight (FHB), caused by Fusarium graminearum is a devastating disease that affects global wheat production. F. graminearum encodes many effector proteins; however, its virulence mechanisms are poorly understood. In this study, we identified a secretory effector candidate protein (FgEC10) that is essential for the virulence of F. graminearum and suppresses the basal immune response. FgEC10 interacted strongly with wheat fumarylacetoacetate hydrolase (TaFAH) and accelerated its degradation via the 26S proteasome pathway. In addition, we showed that TaFAH interacted with TaPSMD, an important component of the 26S proteasome and that FgEC10 enhanced the interaction between TaFAH and TaPSMD. RNA silencing or overexpression of TaFAH in wheat plants showed that TaFAH positively regulated wheat FHB resistance, heading period, and grain yield. Transcriptomic analysis revealed that TaFAH promoted the expression of genes associated with disease resistance and the heading period. Metabolomic analysis revealed that overexpression of TaFAH increased the levels of several amino acids that inhibited F. graminearum growth and enhanced wheat resistance to FHB. Collectively, our study reveals a novel pathogenic mechanism and provides a valuable genetic resource for improving FHB resistance and grain yield in wheat.

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The biocontrol agent Pseudomonas chlororaphis PA23 primes Brassica napus defenses through distinct gene regulatory networks

Project description:Background: The biological control agent Pseudomonas chlororaphis PA23 is effective at protecting Brassica napus (canola) from the necrotrophic fungus Sclerotinia sclerotiorum via direct antagonism. Despite the growing importance of biocontrol bacteria in plant protection from fungal pathogens, little is known about how the host plant responds to bacterial priming on the leaf surface or about changes in gene activity genome-wide in the presence and absence of S. sclerotiorum. Results: PA23 priming of mature canola plants reduced the number of lesion forming petals by 90%. Global RNA sequencing of the host pathogen interface showed a reduction in the number of genes uniquely upregulated in response to S. sclerotiorum by 16-fold when pretreated with PA23. Upstream defense-related gene patterns suggest MAMP-triggered immunity via surface receptors detecting PA23 flagellin and peptidoglycans. Although systemic acquired resistance was induced in all treatment groups, a response centered around a glycerol-3-phosphate (G3P)-mediated pathway was exclusively observed in plants treated with PA23 alone. Activation of these defense mechanisms by PA23 involved mild reactive oxygen species production as well as pronounced thylakoid membrane structures and plastoglobule formation in leaf chloroplasts. Conclusion: Further to the direct antibiosis that it exhibits towards the pathogen S. sclerotiorum, PA23 primes defense responses in the plant through the induction of unique local and systemic defense regulatory networks. This study has shed light on the potential effects of biocontrol agents applied to the plant phyllosphere. Understanding these interactions will aid in the development of biocontrol systems as a viable alternative to chemical pesticides in the protection of important crop systems.

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Transcriptome analysis of a wheat NIL pair carrying FHB resistant and susceptible alleles

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Effect of salicylic acid on Fusarium graminearum, the major causal agent of fusarium head blight in wheat

Project description:Salicylic acid (SA) is one of the key signal molecules in regulating plant resistance to diverse pathogens. It is predominantly associated with resistance against biotrophic and hemibiotrophic pathogens, and triggering systemic acquired resistance (SAR) in Arabidopsis. However, whether and how SA directly affects Fusarium graminearum and how SA influences the defence efficiency of wheat against fusarium head blight (FHB) are still poorly understood. Previous experiments have shown that the growth of F. graminearum mycelia and the germination of spores were significantly inhibited, and eventually stopped by increasing amounts of SA in both liquid and solid media cultures. Co-inoculation of SA and Fg spores has led to reduced FHB symptoms in the very susceptible Triticum aestivum cultivar ‘Roblin’. To better understand the effect of SA on F. graminearum mycelial growth, we have compared the expression profiles of SA-treated and untreated F. graminearum liquid cultures after 8 and 24 h of treatment, using an F. graminearum custom-commercial microarray. The microarray analysis suggests that F. graminearum can metabolize SA through two pathways, the gentisate and catechol pathways that are present in many fungal species. Additional experiments have confirmed the capacity of F. graminearum to metabolize SA. Our results demonstrate that, although F. graminearum has the capacity to metabolize SA, SA has a significant and direct impact on F. graminearum through a reduction in efficiency of germination and growth at higher concentrations.

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