Fusarium wilt pathogens represent an ongoing threat to pepper production worldwide. This is the first report providing data on the molecular identification of Fusarium fungi that cause wilt in pepper in the southern regions of Russia. Monitoring of the Fusarium infection on pepper was carried out in 2019–2022 in two economically important regions of this culture production: the Krasnodar Krai and Crimea. Based on a phylogenetic analysis of the translation elongation factor (EF1a) and the internal transcribed spacer (ITS), as well as the macro- and micromorphological characteristics of the fungi, the causative agents of Fusarium wilt have been identified. The causative agents identified as representatives of the Fusarium species composition included: F. clavus, F. solani, F. oxysporum, F. verticillioides, F. commune, F. torulosum, and F. sporotrichioides. Depending on the region, the specifics of biodiversity and the ratio of these species in pathocomplexes were noted. In Crimea, wilting could be attributed to all of the identified species; in the Krasnodar Krai, F. verticillioides and F. clavus were found to contribute to wilting. The pathogenicity test showed that the pathogens of pepper wilting in Russia, in addition to the already known F. oxysporum and F. solani, are the species F. clavus and F. verticillioides. This is the first report on the ability of these species to cause Fusarium wilt in pepper cultures. The obtained data will be of practical value for the development of biological control measures for fungi of the genus Fusarium, which cause pepper wilt in areas of industrial production and seed production. In addition, data on species composition and aggressive isolates will be used in a pepper breeding program for resistance to Fusarium wilt.

The intergenic space of plant genomes encodes many functionally important yet unexplored RNAs. The genomic loci encoding these RNAs are often considered “junk”, DNA as they are frequently associated with repeat-rich regions of the genome. The latter makes the annotations of these loci and the assembly of the corresponding transcripts using short RNAseq reads particularly challenging. Here, using long-read Nanopore direct RNA sequencing, we aimed to identify these “junk” RNA molecules, including long non-coding RNAs (lncRNAs) and transposon-derived transcripts expressed during early stages (10 days post anthesis) of seed development of triticale (AABBRR, 2n = 6x = 42), an interspecific hybrid between wheat and rye. Altogether, we found 796 lncRNAs and 20 LTR retrotransposon-related transcripts (RTE-RNAs) expressed at this stage, with most of them being previously unannotated and located in the intergenic as well as intronic regions. Sequence analysis of the lncRNAs provide evidence for the frequent exonization of Class I (retrotransposons) and class II (DNA transposons) transposon sequences and suggest direct influence of “junk” DNA on the structure and origin of lncRNAs. We show that the expression patterns of lncRNAs and RTE-related transcripts have high stage specificity. In turn, almost half of the lncRNAs located in Genomes A and B have the highest expression levels at 10–30 days post anthesis in wheat. Detailed analysis of the protein-coding potential of the RTE-RNAs showed that 75% of them carry open reading frames (ORFs) for a diverse set of GAG proteins, the main component of virus-like particles of LTR retrotransposons. We further experimentally demonstrated that some RTE-RNAs originate from autonomous LTR retrotransposons with ongoing transposition activity during early stages of triticale seed development. Overall, our results provide a framework for further exploration of the newly discovered lncRNAs and RTE-RNAs in functional and genome-wide association studies in triticale and wheat. Our study also demonstrates that Nanopore direct RNA sequencing is an indispensable tool for the elucidation of lncRNA and retrotransposon transcripts.

This article provides a comprehensive analysis of Virus-Induced Gene Silencing (VIGS), which is an effective tool for studying the functional genomics of organisms that are poorly amenable to genomic editing. The VIGS method is grounded in the plant’s post-transcriptional gene silencing (PTGS) machinery and utilizes recombinant viral vectors to trigger systemic suppression of endogenous plant gene expression, leading to visible phenotypic changes that enable gene function characterization. This article details the application of VIGS in model organisms (Arabidopsis thaliana, Nicotiana benthamiana) and a wide range of crops, with a special focus on the Solanaceae family, particularly pepper (Capsicum annuum L.). This review analyzes the design and structural elements of viral vectors used for VIGS, such as Tobacco Rattle Virus (TRV), Broad Bean Wilt Virus 2 (BBWV2), Cucumber Mosaic Virus (CMV), geminiviruses (CLCrV, ACMV), and satellite virus-based systems. It also critically examines the key factors that determine silencing efficiency. These factors encompass insert design, agroinfiltration methodology, plant developmental stage, agroinoculum concentration, plant genotype, and environmental factors (temperature, humidity, photoperiod). Particular attention is given to optimization strategies, such as the use of viral suppressors of RNA silencing (VSRs). This article concludes with the achievements in using VIGS to identify pepper genes governing fruit quality (color, biochemical composition, pungency), resistance to biotic (bacteria, oomycetes, insects) and abiotic (temperature, salt, osmotic stress) factors, as well as genes regulating plant architecture and development. The results obtained demonstrate the advantages and limitations of VIGS, alongside future perspectives for its integration with multi-omics technologies to accelerate breeding and advance functional genomics studies in pepper.

Schizophrenia varies greatly from person to person, mainly because of its polygenic nature. Consequently, schizophrenia patients form distinct subphenotypes of schizophrenia, with specific symptom patterns and outcomes. This study included 4257 adults, with long-term schizophrenia (control - 8955 individuals) who were assessed for schizophrenia with potentially severe outcomes based on following criteria: disability in functional and/or physical domains before the age of 40; severe negative symptoms (present in infancy or shortly after onset); a continuous course of the disease. Additionally, the time of the onset and aggressive/antisocial tendencies were assessed as one the predictors of potentially severe outcomes. A total of 817 participants met at least three of these criteria, i.e., had disruptive schizophrenia. A genome-wide and transcriptome-wide association study was conducted using linear regression and the PrediXcan algorithm. The obtained data were used to develop a polygenic risk model for early risk prediction of schizophrenia with potentially severe outcomes. Significant associations were found between schizophrenia and variants in CAMTA1, TRHDE, NELFE, and others. The PRS model demonstrated high performance in training, internal and external validation (ROC AUC of 0.9, 0.89, and 0.68, respectively). The functional pathway analysis highlighted pathways involved in ATP metabolism, myeloid cell differentiation, and apoptotic processes. Subphenotyping schizophrenia may enhance the discovery of genetic factors affecting its development and progression. The GWAS and TWAS findings revealed general mechanisms involved in the development of schizophrenia with potentially severe outcomes, such as synapse regulation, inflammation, and apoptosis.

Stem rust caused by the fungus Puccinia graminis f. sp. tritici (Pgt) remains one of the most dangerous diseases of grain crops. This review provides an analysis of the evolution of the relationship between triticale (×Triticosecale Wittmack) and Pgt since the beginning of commercial cultivation of this crop, covering the historical aspects of the spread of the pathogen, changes in its virulence and adaptation to various varieties of triticale, as well as the response measures taken by breeders to increase the resistance of the crop to the disease. The paper presents the regional features of the pathogen’s spread in Russia and in the world’s triticale and wheat growing centers. Special attention is paid to the features of the pathological process of stem rust development on triticale, which, like in wheat, includes the stages of spore germination, penetration into plant tissues and formation of urediopustules. It is noted that triticale, being a hybrid of wheat and rye, is susceptible to both wheat and rye forms of stem rust. The review also covers modern methods for studying triticale resistance to Pgt, including the use of molecular markers for the identification of resistance genes and screening of breeding material. A number of stem rust resistance genes have been described for triticale, such as Sr27, Sr31, SrNin, SrSatu, SrBj, and SrVen, which can be effectively used in breeding programs aimed at creating varieties with long-term and effective resistance to stem rust.

Wheat stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), threatens food security owing to the pathogen’s high virulence and evolutionary variability, as well as the risk of selecting fungicide-resistant forms. For the first time in Russia, we performed a comparative analysis of virulence and genetic diversity in fungicide-target genes (SdhA–SdhD, Cyp51) in 35 monopustular Pgt isolates collected from regions with contrasting fungicide pressure (Saratov, n = 12; Chelyabinsk, n = 12; Moscow, n = 11). Phenotyping on an extended set of nearly isogenic lines carrying different Sr genes revealed regional specificity in effective resistance genes (Sr13, Sr26, Sr31, Sr32, Sr35), underscoring the vulnerability of genetic protection in Russian commercial cultivars. Targeted amplicon sequencing using the Oxford Nanopore Technologies platform produced 175 amplicons (~38,290 long reads, N50 = 1.06 kb), identifying 87% synonymous SNPs, 12% non-synonymous substitutions, and a single nonsense mutation in SdhA (position 580). The Cyp51 and SdhA genes were the most polymorphic. Recurrent non-synonymous mutations in these genes were detected in Pgt clones from regions with intensive agriculture and high use of chemical plant protection products. These results support the need for predictive breeding of resistant cultivars and adaptation of chemical control within integrated Pgt management in the European part of Russia.