Potato is a globally important staple, but postharvest diseases such as dry rot, caused by Fusarium spp., threaten production and lead to major economic losses and food safety risks. Limited resistant cultivars highlight the need for phenotypic screening and integration with genomic tools to improve resistance and breeding efficiency. A total of 336 potato genotypes, including 295 commercial varieties and 41 breeding clones, were evaluated under post-harvest conditions following artificial inoculation. Tubers were inoculated with Fusarium sambucinum, and lesion penetration measured to classify susceptibility. Overall, this study provides one of the most comprehensive phenotypic evaluations of dry rot resistance in potato germplasm to date. While no variety was fully resistant, the identification of both moderately susceptible and highly susceptible cultivars offers valuable insights for breeding programs and contributes to the development of more resilient potato production and storage systems. In addition, this phenotypic screening can be integrated with genomic tools to accelerate breeding for improved resistance and postharvest performance.
Three robust marker trait associations are identified, one to spot blotch on chromosome 4H and two to leaf stripe on chromosomes 6H and 7H, which may provide robust resistance not previously incorporated into breeding programs.
Shaun J. Clare, A. Oğuz, A. Karakaya et al.· 0 citations
Potato viral infections are among the main factors contributing to reduced quality of planting material and decreased tuber productivity. Currently, no reliable chemical control methods are available for plant viral diseases. Therefore, the development of potato cultivars carrying virus resistance genes remains one of the most effective and comprehensive approaches to this problem. In this study, 29 Russian and foreign potato cultivars, as well as 31 Far Eastern potato hybrids were evaluated. Resistance genes were identified using PCR analysis. The following cultivars carrying target resistance genes were used as positive controls for method calibration: Meteor (Rysto, Rx1, Sen1, Gpa2, H1), Vektor (Rx1, Gpa2), Yubilyar (Gpa2), and Zhukovsky ranniy (Gpa2, Rx1). Method calibration enabled determination of optimal magnesium chloride concentrations: 2.0 mM for Gpa2 and 2.5 mM for Rx1. Genotyping of 29 potato cultivars identified several highly resistant accessions, including Yubilyar, Zhukovsky ranniy, Bellarosa, Sante, Smak, Red Scarlett, and Laperla. These cultivars combined resistance to Potato virus X (Rx1) with complex resistance to two nematode species (Gpa2, H1). In the studied population, high frequencies of the Gpa2 (82.8%) gene and the H1 (65.5–69.0%) gene group were observed. Statistical analysis provided strong evidence for tight genetic linkage between the Rx1 and the Gpa2 loci on chromosome 12. The association was highly significant (p < 0.001). Analysis of 31 potato hybrids revealed 14 multi-marker genotypes with high breeding potential. A stable combination of five target resistance markers was consistently detected in their genomes. A dominant hybrid family derived from the Yantar × Smak cross was identified, represented by five related lines. For the first time, a precise heritability coefficient was calculated for the STS marker of the Rx1 gene in a Far Eastern hybrid population. The estimate reached h2 = 0.835 at p = 0.01. This value significantly exceeded the critical threshold for breeding reliability (h2 > 0.7), indicating largely additive genetic control of the trait. These results support targeted selection of parental combinations for breeding programs aimed at improving virus and nematode resistance in potato.
Irina V. Kim, O. Sobko, P. Fisenko et al.· Plants· 0 citations
The aim of this study was to identify genes conferring late blight resistance in 30 promising potato hybrids using DNA markers and found all three genes indicates a high degree of late blight resistance.
N. Doguzova· Izvestiâ Timirâzevskoj selʹs...· 0 citations
Fusarium wilt, caused by Fusarium oxysporum f. sp. ciceris, is a major constraint to chickpea production worldwide, resulting in substantial yield reduction and deterioration of crop quality. The effectiveness of host resistance is often challenged by the emergence of new pathogen races, necessitating the continuous identification of resistant germplasm for breeding programs. This study was conducted to identify chickpea genotypes with resistance to Fusarium wilt and to select promising materials for further breeding. A total of 47 chickpea genotypes, along with two standard checks (Geletu and Dimtu), were evaluated under field conditions during the 2022 and 2023 main cropping seasons using an augmented experimental design. Disease incidence was recorded at both seedling and flowering stages, and genotypes were classified according to the ICRISAT disease rating scale. Considerable variation in disease response was observed among the tested genotypes. Two genotypes exhibited resistant reactions, while seventeen were categorized as moderately resistant. Overall, nineteen genotypes demonstrated desirable levels of resistance and were identified as valuable sources of resistance for future chickpea improvement programs. These genotypes can be advanced to subsequent breeding stages for the development of Fusarium wilt-resistant chickpea varieties.
Daba Etafa· American Journal of Plant Bi...· 0 citations
These findings uncover new QTLs for PM resistance in strawberry, including on fruit, and provide validated strategies for breeding disease-resistant cultivars.
Alexandre Prohaska, Pol Rey-Serra, J. Bénéjam et al.· Horticulture Research· 0 citations
Yellow Mosaic Virus (YMV), primarily transmitted by the whitefly (Bemisia tabaci), poses a critical threat to blackgram (Vigna mungo) cultivation across tropical and subtropical regions. The virus causes severe yield losses by inducing yellow mosaic symptoms, stunted growth and poor pod development. This review summarizes current advancements in resistance breeding, encompassing conventional selection, marker-assisted selection (MAS), QTL mapping and biotechnological tools such as genome editing and transcriptomics through comprehensive analysis of published literature from 1991 to 2025. Traditional control measures, including vector management, are often ineffective due to environmental and viral variability. Resistance breeding has emerged as a sustainable solution, supported by the identification of resistant germplasm, wild relatives and molecular markers. The paper highlights challenges like pathogen variability, limited genetic diversity and environmental influences. Future perspectives emphasize integrating high-throughput phenotyping, genomic resources and collaborative breeding strategies to develop durable, high-yielding, YMV-resistant blackgram cultivars. These efforts are essential for enhancing productivity, food security and climate resilience in pulse-growing regions.
A. Bharathi, K. S. Vijai Selvaraj, P. Sivakumar et al.· Legume Research An Internati...· 0 citations
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