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Gene Expression of Putative Pathogenicity-Related Genes in Verticillium dahliae in Response to Elicitation with Potato Extracts and during Infection Using Quantitative Real-Time PCR.

ABSTRACT: Quantitative real-time PCR was used to monitor the expression of 15 Verticillium dahliae's genes, putatively involved in pathogenicity, highly (HAV) and weakly aggressive (WAV) V. dahliae isolates after either (i) elicitation with potato leaf, stem, or root extracts, or (ii) inoculation of potato detached petioles. These genes, i.e., coding for Ras-GAP-like protein, serine/threonine protein kinase, Ubiquitin-conjugating enzyme variant-MMS2, NADH-ubiquinone oxidoreductase, Thioredoxin, Pyruvate dehydrogenase E1 VdPDHB, myo-inositol 2-dehydrogenase, and HAD-superfamily hydrolase, showed differential upregulation in the HAV versus WAV isolate in response to plant extracts or after inoculation of potato leaf petioles. This suggests their potential involvement in the observed differential aggressiveness between isolates. However, other genes like glucan endo-1,3-alpha-glucosidase and nuc-1 negative regulatory protein VdPREG showed higher activity in the WAV than in the HAV in response to potato extracts and/or during infection. This, in contrast, may suggest a role in their lower aggressiveness. These findings, along with future functional analysis of selected genes, will contribute to improving our understanding of V. dahliae's pathogenesis. For example, expression of VdPREG negatively regulates phosphorus-acquisition enzymes, which may indicate a lower phosphorus acquisition activity in the WAV. Therefore, integrating the knowledge about the activity of both genes enhancing pathogenicity and those restraining it will provide a guild line for further functional characterization of the most critical genes, thus driving new ideas towards better Verticillium wilt management.

SUBMITTER: Zhu X

PROVIDER: S-EPMC8146963 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Intercropping could alleviate soil-borne diseases, however, few studies focused on the immunity of the host plant induced by the interspecific interactions. To test whether or not intercropping could enhance the disease resistance of host plant, we investigated the effect of companion cropping with potato onion on tomato Verticillium wilt caused by Verticillium dahliae (V. dahliae). To investigate the mechanisms, the root exudates were collected from tomato and potato onion which were grown together or separately, and were used to examine the antifungal activities against V. dahliae in vitro, respectively. Furthermore, RNA-seq was used to examine the expression pattern of genes related to disease resistance in tomato companied with potato onion compared to that in tomato grown alone, under the condition of infection with V. dahliae. The results showed that companion cropping with potato onion could alleviate the incidence and severity of tomato Verticillium wilt. The further studies revealed that the root exudates from tomato companied with potato onion significantly inhibited the mycelia growth and spore germination of V. dahliae. However, there were no significant effects on these two measurements for the root exudates from potato onion grown alone or from potato onion grown with tomato. RNA-seq data analysis showed the disease defense genes associated with pathogenesis-related proteins, biosynthesis of lignin, hormone metabolism and signal transduction were expressed much higher in the tomato companied with potato onion than those in the tomato grown alone, which indicated that these defense genes play important roles in tomato against V. dahliae infection, and meant that the disease resistance of tomato against V. dahliae was enhanced in the companion copping with potato onion. We proposed that companion cropping with potato onion could enhance the disease resistance of tomato against V. dahliae by regulating the expression of genes related to disease resistance response. This may be a potential mechanism for the management of soil-borne plant diseases in the intercropping system.

Project description:Purpose: Verticillium dahliae is a fungal plant pathogen. The goals of the study are to examine gene networks involved in controlling resistance to V. dahliae in potato using expression quantitative trait loci (eQTL) mapping. Methods: 91 clones from a diploid potato mapping population 15143 and the parental lines 07506-01 and 12120-03 from the Agriculture and Agri-Food Canada in Fredericton, New Brunswick, Canada were propagated in a V. dahliae-infested field in triplicate plots of five plants in a randomized complete block design. Tetraploid varieties Shepody, Hindenburg, Kennebec, Russet Burbank, Atlantic and Green Mountain were planted similarly and included in the analysis. Green Mountain was also planted in additional plots and used a guard row clone. Leaf samples were taken at 70 days after planting. Two µg of total RNA per sample was used to construct DeepSAGE tag libraries using a modification to facilitate direct sequencing of the amplicons by Illumina sequencing. The samples from 91 clones were bar-coded with a different identification key. Samples were diluted to a final concentration of 10 nM and were pooled. Each of the three biological replicates was done in a separate pool. Final pool concentrations were estimated using Quant-iT-PicoGreen prior to template DNA hybridization and sequencing on an Illumina Genome Analyzer II according to the manufacturer's instructions. Results: Tag count data were transformed to the relative unit of counts per million. Tags included in the analysis had to be present in at least one biological replicate. Clonal variation between samples was detected (p-value ≤ 0.05) using the exact test for a negative binomial distribution . Tags that did not have significant clonal variation were removed, leaving 6248 tags. The LS mean of tag count was calculated for each tag for each clone. The 21-nt tag sequences were aligned against PGSC S. tuberosum group Phureja DM1-3 transcripts (v3.4) using blastn. Hits with E-value ≤ 0.5 were filtered in. Where there were multiple blast hits meeting E-value criteria, only the one with the longest alignment was included. 4198 tags were assigned single-hit annotations in this manner and were used for eQTL analysis. Conclusions: The results indicated that for most genes the eQTL controlling expression was mapped near the gene (cis-eQTL). There were also many trans-eQTLs, where were eQTLs for a gene that were found on another chromosome particularly on chromosome 5.

Project description:The initial interaction of a pathogenic fungus with its host is complex and involves numerous metabolic pathways and regulatory proteins. Considerable attention has been devoted to proteins that play a crucial role in these interactions, with an emphasis on so-called effector molecules that are secreted by the invading microbe to establish the symbiosis. However, the contribution of other types of molecules, such as glycans, is less well appreciated. Here, we present a random genetic screen that enabled us to identify 58 novel candidate genes that are involved in the pathogenic potential of the fungal pathogen Verticillium dahliae, which causes vascular wilt diseases in over 200 dicotyledonous plant species, including economically important crops. One of the candidate genes that was identified concerns a putative biosynthetic gene involved in nucleotide sugar precursor formation, as it encodes a putative nucleotide-rhamnose synthase/epimerase-reductase (NRS/ER). This enzyme has homology to bacterial enzymes involved in the biosynthesis of the nucleotide sugar deoxy-thymidine diphosphate (dTDP)-rhamnose, a precursor of L-rhamnose, which has been shown to be required for virulence in several human pathogenic bacteria. Rhamnose is known to be a minor cell wall glycan in fungi and has therefore not been suspected as a crucial molecule in fungal-host interactions. Nevertheless, our study shows that deletion of the VdNRS/ER gene from the V. dahliae genome results in complete loss of pathogenicity on tomato and Nicotiana benthamiana plants, whereas vegetative growth and sporulation are not affected. We demonstrate that VdNRS/ER is a functional enzyme in the biosynthesis of uridine diphosphate (UDP)-rhamnose, and further analysis has revealed that VdNRS/ER deletion strains are impaired in the colonization of tomato roots. Collectively, our results demonstrate that rhamnose, although only a minor cell wall component, is essential for the pathogenicity of V. dahliae.

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Gene Expression of Putative Pathogenicity-Related Genes in Verticillium dahliae in Response to Elicitation with Potato Extracts and during Infection Using Quantitative Real-Time PCR.

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