Pathotype Ro1 Research Articles

New nematode-resistant potato varieties

Goal. Creation of new varieties of potatoes of different groups of ripeness, table use, high productivity, increased level of starch and good taste qualities, resistant to the golden cyst-forming nematode, common and aggressive pathotypes of cancer, fungal and bacterial diseases.
 Methods. Selection work was carried out in accordance with the generally accepted scheme of the selection process. The resistance of breeding material against Globodera rostochiensis was evaluated in accordance with the «Regulations on the Procedure for Testing Potato Varieties and Hybrids».
 Results. The 12 best hybrids — Zlagoda, Myroslava, Knyaginya, Vzyrets, Bazaliya, Opillya, Bazhana, Fanatka, Avangard, Predslava, Oleksandrite and Rostavitsa — were selected and submitted to the State Trial as varieties. Of the 12 transferred varieties, 11 (Zlagoda, Myro slava, Knyaginya, Vzyrets, Bazaliya, Opillya, Avangard, Predslava, Oleksandrit, Fanatka, Rostavitsa) successfully passed the State variety test in 2023 and were entered into the State Register of plant varieties suitable for distribution in Ukraine.
 Conclusions. The new 11 varieties included in the State Register of plant varieties suitable for distribution in Ukraine are advisable to use as a means of controlling the harmfulness of the golden potato nematode in areas infected with Globodera rostochiensis (pathotype Ro1).

Brodie, a Dual-Purpose Chipping and Tablestock Variety with Resistance to Pathotypes Ro1 and Ro2 of the Golden Cyst Nematode and Partial Resistance to Pathotype Pa2/3 of the Pale Cyst Nematode

Brodie, a Dual-Purpose Chipping and Tablestock Variety with Resistance to Pathotypes Ro1 and Ro2 of the Golden Cyst Nematode and Partial Resistance to Pathotype Pa2/3 of the Pale Cyst Nematode

Phenotypic and DNA Marker-Assisted Characterization of Russian Potato Cultivars for Resistance to Potato Cyst Nematodes

Potato is one of the most important food crops in the world and also in the Russian Federation. Among harmful organisms reducing potato yield potential, the potato cyst nematodes (PCN) are considered to be ones of the most damaging pests. Information on PCN resistant cultivars is important for potato breeding and production. Russian potato cultivars are characterized in the state-bio-test program for resistance to only one PCN species Globodera rostochiensis and one pathotype Ro1 which is reported to be present in the country. This study aimed to find domestic cultivars with multiple resistances to different PCN species and different pathotypes using phenotyping coupled with molecular marker analysis due to the risk of the occasional introduction of new pests. The phenotypic response was determined by the inoculation of plants with pathotypes Ro5 of G. rostochiensis and Pa3 of G. pallida. The obtained results were supplemented by the state-bio-test data on resistance to Ro1 of G. rostochiensis. Nine of 26 Russian cultivars were resistant both to Ro5 and Ro1 pathotypes and two cultivars possess multiple resistances to both PCN species. Most tested molecular markers associated with the Gpa2, GpaVvrn, GpaVsspl, Grp1 loci showed discrepancies with phenotyping. However, a predictive haplotype and epistatic effect were detected.

Comparative genomics of two inbred lines of the potato cyst nematode Globodera rostochiensis reveals disparate effector family-specific diversification patterns

BackgroundPotato cyst nematodes belong to the most harmful pathogens in potato, and durable management of these parasites largely depends on host-plant resistances. These resistances are pathotype specific. The current Globodera rostochiensis pathotype scheme that defines five pathotypes (Ro1 - Ro5) is both fundamentally and practically of limited value. Hence, resistant potato varieties are used worldwide in a poorly informed manner.ResultsWe generated two novel reference genomes of G. rostochiensis inbred lines derived from a Ro1 and a Ro5 population. These genome sequences comprise 173 and 189 scaffolds respectively, marking a ≈ 24-fold reduction in fragmentation as compared to the current reference genome. We provide copy number variations for 19 effector families. Four dorsal gland effector families were investigated in more detail. SPRYSECs, known to be implicated in plant defence suppression, constitute by far the most diversified family studied herein with 60 and 99 variants in Ro1 and Ro5 distributed over 18 and 26 scaffolds. In contrast, CLEs, effectors involved in feeding site induction, show strong physical clustering. The 10 and 16 variants cluster on respectively 2 and 1 scaffolds. Given that pathotypes are defined by their effectoromes, we pinpoint the disparate nature of the contributing effector families in terms of sequence diversification and loss and gain of variants.ConclusionsTwo novel reference genomes allow for nearly complete inventories of effector diversification and physical organisation within and between pathotypes. Combined with insights we provide on effector family-specific diversification patterns, this constitutes a basis for an effectorome-based virulence scheme for this notorious pathogen.

Genome Resources of Two Pathotypes of the Potato Cyst Nematode Globodera rostochiensis from New York.

The potato cyst nematode Globodera rostochiensis is a regulated pest posing a serious threat to potato production worldwide. Although the endemic pathotype (Ro1) of G. rostochiensis has been confined to New York State for several decades as a result of quarantine regulations and management with resistant potato cultivars, a virulent pathotype, Ro2, has emerged, for which control measures are scarce. The ability to detect Ro2 early in fields is necessary to sustain the success of G. rostochiensis quarantine in the United States. Here, we report the comparative analysis of whole-genome sequences of multiple single-cyst-derived Ro1 and Ro2 lines, propagated from original field populations. The identified discriminant variants are good targets for developing molecular diagnostic tools for differentiating G. rostochiensis pathotypes in New York.

Wild relatives and interspecific hybrids of potato as source materials in breeding for resistance to golden nematode

Background. Predominant use of the H1 and Gro1-4 genes of resistance to golden nematode (PGN) in potato breeding requires widening the gene pool of resistance to this pathogen.Materials and methods. Thirty-four genotypes of wild potatoes from North and South Americas, 14 interspecific hybrids, and 10 Russian potato cultivars were studied for PGN resistance. Screening for resistance to PGN pathotype Ro1 and molecular screening for the presence of H1 and Gro1-4 gene markers were performed. Amplification products of the Gro1-4 gene marker were sequenced.Results. Only seven among the studied 34 potato genotypes (two of S. brachystotrichum (Bitt.) Rydb., four of S. lesteri Hawkes et Hjerting, and one of S. kurtzianum Bitt. et Wittm.) were susceptible to PGN, while the rest demonstrated high or medium resistance. Molecular screening for the presence of H1 and Gro1-4 gene markers allowed us to identify Gro1-4 in 13 South American genotypes of S. alandiae Cárd., S. × doddsii Corr., S. kurtzianum, S. leptophyes Bitt., and S. yungasense Hawkes. The remaining 14 genotypes may supposedly contain resistance genes non-identical to H1 or Gro1-4. Hybrids of S. tuberosum L. with medium-resistant wild accessions of S. kurtzianum, S. leptophyes, S. sparsipilum (Bitt.) Juz. et Buk., S. alandiae, and S. × doddsii inherited PGN resistance determined either by the Gro1-4 gene or genes non-identical to H1 or Gro1-4. Sequencing a fragment of the Gro1-4 gene showed that changes in the structure of this fragment in orthologous genes did not affect the feature of resistance to PGN pathotype Ro1.Conclusion. For the first time, sources of resistance to PGN were found among the North American species S. brachystotrichum (k-23201) and S. lesteri (k-24475). Among the wild South American Solanum spp., sources of resistance determined by genes different from H1 or Gro1-4 were identified. Resistant interspecific hybrids can serve as donors of the Gro1-4 resistance gene or new resistance genes.

Identification of Interspecific Potato Hybrids with Combined Resistance to Late Blight (Phytophthora Infestans) and Nematode (Globodera Rostochiensis)

Abstract Late blight (agent Phytophthora infestans) and potato cyst nematode (PCN) caused by Globodera rostochiensis are economically important pathogens, which may significantly reduce potato yields. In this study interspecific potato hybrids were used as a source of resistance for combined resistance to economically important potato pathogens: late blight and cyst nematode. The aim of our study was to identify hybrid progenies with combined resistance to both pathogens and to verify the applicability of several molecular markers associated with resistance to G. rostochiensis pathotype Ro1 to identify resistant plants. Ninety-two clones of eleven original interspecific potato hybrids obtained in crosses with the cultivated S. tuberosum group tuberosum, S. tuberosum group Andigena, S. tuberosum group Phureja and wild S. guerreroense, S. microdontum, S. kurtzianum, S. neoantipoviczii and S. tarijense potato species were screened in bioassays and by molecular markers. PCN resistant or moderately resistant clones were found among the progenies of nine hybrids. Results were highly correlated with resistance status detected by molecular markers linked to the H1 (marker 57R) and Gro1-4 (marker Gro1) genes. Marker CP113 (linked to the H1 gene) was not polymorphic and failed to detect resistance status. Combination of foliar late blight resistance and resistance to PCN was identified in hybrids obtained in crosses with plants of species S. microdontum, S. tarijense and S. phureja and in the hybrid between S. guerreroense and Black’s P. infestans race differential carrying gene R-5.

EVALUATION OF RESISTANCE OF POTATO VARIETIES OF FOREIGN SELECTION TO GLOBODERA

Under the vegetation experiment, two susceptible potato varieties (Sineglazka, Udacha) and 11 varieties of foreign selection were grown in the soil infected with golden potato nematode (Globodera rostochiensis) (more than 4 thousand eggs and larvae of Globodera rostochiensis per a 800 cubic cm vessel). On the 70th day after the emergence of seed potatoes on the surface of the ball of soil, 53 white and yellow Globodera rostochiensis females were found on the roots of the susceptible Sineglazka variety, and 17 females were found on the ball of soil of the standard Udacha variety, which may be explained by weak development of the root system due to rotten tubers. As a result of foreign potato varieties evaluated for resistance to Globodera rostochiensis, it was found that all tested potato varieties Riviera, Excellence, Bellarosa, Rocco, Arizona, Evolution, Impala, Picasso, Arrow, Veneta and Coletta were resistant to the Vladimir population of the golden potato nematode Globodera rostochiensis of the pathotype Ro1. One to three Globodera rostochiensis females were found on the roots of varieties Excellence, Bellarosa, Rocco, Arizona, Impala, Veneta and Coletta. Six females of Globodera rostochiensis were identified in the Arrow variety. Females were not found on the roots of varieties Riviera, Evolution and Picasso.

DISTRIBUTION OF PCN PATHOTYPES IN POLAND

Both Globodera rostochiensis (Wollenweber, 1923) Behrens, 1975 and Globodera pallida (Stone, 1973) are considered the most economically important nematode pest. Annual regional survey conduct in Poland have revealed high infestation of pathotype Ro1 to the northwest of the country and presence of new pathotype Ro5 of G. rostochiensis. In 2009-2013 fifty eight soil samples were tested. parasitic root organisms cause significant losses in quantity and quality of potato crops. In many European countries PCN have become a major problem in potato production mainly in starch potato cultivars. The pathotype Ro1 was detected mostly in central and northern Poland and pathotype Ro5 in four separated provinces: malopolskie, lubuskie, lubelskie and pomorskie. The abundance of cysts in location where the new pathotype was detected suggests that is a thread of further spread of pathotype Ro5 of G. rostochiensis in the country. Consequently, producers and farmers need to grow resistant potato cultivars to keep nematode population below damaging level. These results indicate the urgent need to prevent the spread of PCN to non-infested areas. This report focused on identification of nematode pathotypes in soil samples from infested polish fields and presentation of G. rostochiensis distribution on territory of Poland.

PM 9/26 (1) National regulatory control system for Globodera pallida and Globodera rostochiensis

Specific scopeThis Standard describes a national regulatory control system for Globodera pallida and Globodera rostochiensis.

High resolution DNA melting markers for identification of H1-linked resistance to potato cyst nematode

Although Sequence-Characterized Amplified Region (SCAR) markers linked to the potato H1 locus, which confers resistance to pathotypes Ro1 and Ro4 of the potato cyst nematode (PCN) Globodera rostochiensis, have been reported, robust markers that enable estimation of allele dosage would improve the quality of information obtained from genotyping parental accessions (cultivars/breeding lines) and progeny populations within breeding programmes. With this in mind, we have developed single nucleotide polymorphism (SNP)-based molecular markers flanking the H1 resistance gene, using genomic re-sequence data from five elite tetraploid accessions. The published TG689 and 57R primer sequences were used in a Basic Local Alignment Search Tool (BLAST) examination of the reference potato genome, and SNPs within the vicinity of these primer regions were identified and targeted for designing probe-based High Resolution Melting (HRM) SNP assays. Evaluation of the subsequently developed HRM markers, TG689_1P and 57R_1P, against the publicly available SCAR markers, TG689 and 57R, indicated that the HRM markers enabled more reliable marker-trait association than the SCARs. Additionally, allelic dosage estimates for the H1 locus were also derived using the TG689_1P marker, providing a tool to optimise parental and progeny selections in PCN resistance breeding.

MOLECULAR SCREENING OF POTATO VARIETIES BRED IN THE NORTHWESTERN ZONE OF THE RUSSIAN FEDERАTION

Increasing the resistance of varieties to diseases and pests is a priority in potato breeding. Many potato varieties created in the Leningrad Scientific Research Institute of Agriculture “Belogorka” are multi-species hybrids possessing complex resistance to the most spread pathogens in combination with a high plasticity, which determined their zoning in many regions of the Russian Federation. Potato varieties and hybrids created in different periods of time in this institute and in the Ltd Breeding company “LiGa” were included in marker-assisted selection with 22 markers of 14 R genes conferring extreme resistance to viruses PVY and PVX, resistance to cyst nematodes Globodera pallida (patotypes Pa2, Pa3) and G. rostochiensis (pathotype Ro1) and resistance to late blight. The data of molecular screening were compared with the results of the State Test of Varieties for Disease Resistance, as well as with other published sources. Markers of sterile and fertile cytoplasm types were also used in the study. Based on the results of molecular screening, varieties and hybrids with different combinations of markers of R genes conferring resistance to the most harmful pathogens (Ry sto , Ry-f sto , Rx1, Rx2, Gro1-4, H1, Gpa2, R1, R3a, Rpi-blb1, Rpi-sto1) were detected. Among them, genotypes with sterile D-, T-, W/gamma cytoplasmic types were selected. Analysis of their pollen fertility, crossability and pedigree data showed that breeders succeed in obtaining fertile forms with the D- and T-types of cytoplasm carrying genetic material of Mexican polyploid species Solanum stoloniferum and S. demissum. The information about the presence of markers of R genes and about cytoplasm types of hybrids and varieties will allow an effective implementation of further breeding programs for resistance to a complex of pathogens, including pyramiding of R genes. The data of molecular screening made it possible to specify the pedigrees of several varieties and hybrids that have been created over several decades.

An Evaluation of two H1-Linked Markers and their Suitability for Selecting Globodera rostochiensis Resistant Potatoes in the New York Breeding Program

The golden cyst nematode (Globodera rostochiensis) is a serious pest that can dramatically reduce potato crop yield. Pathotype Ro1 of G. rostochiensis was first detected in the United States in 1941 and is still present on several farms in New York State. The H1 gene confers high levels of resistance to pathotype Ro1 but screening for it with a bioassay is time consuming and expensive. In this study two known molecular markers, 57R and TG689, were evaluated for their ability to identify resistant clones among 38 global cultivars and 350 New York breeding clones. The ability of either marker to predict resistance was high – 99.7% and 98.3% for 57R and TG689, respectively – but the ability to predict susceptibility was much lower, 47% and 41%, respectively. As resistance is the trait of interest, either of these markers is sufficient to make selection decisions in a practical breeding program. Cases exhibiting discordance between presence/absence of diagnostic markers and bioassay results were investigated further. Recombination, inflow of other resistance genes, and occasional failure of marker- and/or bio-assays are discussed as potential causes.

МАРКЕР-ОПОСРЕДОВАННАЯ СЕЛЕКЦИЯ ОТЕЧЕСТВЕННЫХ СОРТОВ КАРТОФЕЛЯ С МАРКЕРАМИ ГЕНОВ УСТОЙЧИВОСТИ К ЗОЛОТИСТОЙ КАРТОФЕЛЬНОЙ НЕМАТОДЕ (ПАТОТИП RO1)

The results of molecular screening of 103 Russian breeding varieties from the VIR potato collection are presented. These varieties were studied for the presence of diagnostic markers associated with the HI and Grol-4 genes conferring resistance to the golden potato cyst nematode - Globodera rostochiensis (Woll.) Behr. - pathotype Ro1. 25 varieties possessed the diagnostic markers of these genes. Among the nematode-resistant varieties, the frequency of genotypes with the diagnostic fragments of 57R and N195 markers of the Hl locus was 98%, and of marker Gro1-4-1 of the Grol-4 gene - 2%.

Potato resistance to quarantine diseases

The causal agent of potato wart Synchytrium endobioticum (Schilb.) Perc. and golden potato cyst nematode (GPCN) Globodera rostochiensis (Wollenweber) Behrens are the quarantine species causing the most widespread and destructive diseases of potato in the Russian Federation and other countries. The pale potato cyst nematode Globodera pallida (Stone) Behrens is not found in Russia, although in the European Union it is found everywhere. This review provides information on the harmfulness of S. endobioticum and GPCN. To date, 43 pathotypes of S. endobioticum and 5 pathotypes of GPCN have been revealed in the world. In the Russian Federation, only the first (D1) pathotype of potato wart and pathotype Ro1 of GPCN have been found. Modern sets of differentials for S. endobioticum and GPCN and methods to determine the pathotype composition, including efforts to develop molecular markers (SSRs) to determine the race of S. endobioticum, are presented. The data on the resistance of commercial potato cultivars to these quarantine diseases and methods to determine resistance against them are reviewed. The modern data on the genetics of potato resistance to S. endobioticum, G. rostochiensis, and G. pallida, including mapping and cloning R-genes, are presented. The available published data on the molecular markers of R-genes for marker-assisted selection (MAS) and the evaluation of their effectiveness are presented. The use of multiplex systems allows the presence of several resistance genes to one or more pathogens to be analyzed at the same time. Mechanisms of potato’s quantitative resistance to S. endobioticum and GPCN and adaptation processes in pathogen populations resulting in overcoming the resistance of the host are discussed. The cultivation of varieties poorly susceptible to GPCN can stimulate the adaptive variability of the pathogen and induce virulent pathotypes for two or three pathogen generations.

Genetic diversity of potato varieties bred in Russia and its neighboring countries based on the polymorphism of SSR-loci and markers associated with resistance R-genes

The genetic diversity of potato varieties from the collection of Vavilov Institute of Plant Genetic Resources (VIR) was analyzed based on microsatellite analysis. These varieties have been bred in Russia and its neighboring countries since 1931. Application of 14 highly polymorphic nuclear microsatellites (SSRs) has enabled 113 varieties to be fully distinguished. Additionally, we have studied these varieties for the distribution of 8 DNA markers associated with three R-genes involved in controlling resistance to two quarantine objects: potato wart Synchytrium endobioticum and golden potato cyst nematode Globodera rostochiensis, occurring locally in some regions of the Russian Federation. All the analyzed varieties with resistance to the S. endobioticum pathotype 1 revealed the diagnostic marker Nl251400 of the Sen1 gene, while a few susceptible cultivars lost this diagnostic fragment. The tested markers of the H1 and Gro1-4 genes, which confer resistance to the G. rostochiensis pathotype Ro1 revealed different predictability. In the molecular screening of potato varieties, it is better to use several markers of these genes. The results of molecular screening using six markers of H1 and Gro1-4 genes allowed us to detect six haplotypes in the tested subset. Five haplotypes include varieties with different combinations of the markers tested; the majority (87.9%) of these varieties were highly resistant or moderately resistant to G. rostochiensis. The most numerous haplotype H1/0 included 76 varieties, which did not possess any marker of H1 and Gro1-4 genes; 96.1% of these varieties were susceptible to G. rostochiensis. Predictive associations between the haplotype content, wart and nematode resistance, pedigree, and the variety in their age are discussed.

Potato resistance to quarantine diseases

The casual agent of potato wart Synchytrium endobioticum (Schilb.) Perc. and potato golden nematode (PGN) Globodera rostochiensis (Wollenweber) Behrens are the quarantine species causing the most widespread and destructive diseases of potato in the Russian Federation and other countries of the world. The potato pale nematode Globodera pallida (Stone) Behrens is not found in Russia, although in the European Union it is found everywhere. The review provides information on the harmfulness of S. endobioticum and PGN. To date, 43 pathotypes of S. endobioticum and 5 pathotypes of PGN have been revealed in the world. In the Russian Federation, only the first (D1) pathotype of potato wart and pathotype Ro1 of PGN have been found. Modern sets of differentials for S. endobioticum and PGN and methods of pathotype composition determination, including efforts to develop molecular markers (SSR) to determine the race of S. endobioticum, are presented. Data on the resistance of commercial potato cultivars to these quarantine diseases and methods for resistance determination are reviewed. Modern data on the genetics of potato resistance to S. endobioticum, G. rostochiensis and G. pallida, including mapping and cloning of R-genes, are presented. Available literature data on molecular markers of R-genes for marker assisted selection and the evaluation of their effectiveness are presented. The use of multiplex systems allows the presence of several genes for resistance to one or more pathogens to be analyzed at once. Mechanisms of potato quantitative resistance to S. endobioticum and PGN and adaptation processes in pathogens populations resulting in overcoming resistance of host are discussed. Cultivation of cultivars poorly susceptible to PGN can stimulate the adaptive variability of the pathogen and induce virulent pathotypes for 2–3 pathogen generations.

The genome of the yellow potato cyst nematode, Globodera rostochiensis, reveals insights into the basis of parasitism and virulence.

BackgroundThe yellow potato cyst nematode, Globodera rostochiensis, is a devastating plant pathogen of global economic importance. This biotrophic parasite secretes effectors from pharyngeal glands, some of which were acquired by horizontal gene transfer, to manipulate host processes and promote parasitism. G. rostochiensis is classified into pathotypes with different plant resistance-breaking phenotypes.ResultsWe generate a high quality genome assembly for G. rostochiensis pathotype Ro1, identify putative effectors and horizontal gene transfer events, map gene expression through the life cycle focusing on key parasitic transitions and sequence the genomes of eight populations including four additional pathotypes to identify variation. Horizontal gene transfer contributes 3.5 % of the predicted genes, of which approximately 8.5 % are deployed as effectors. Over one-third of all effector genes are clustered in 21 putative ‘effector islands’ in the genome. We identify a dorsal gland promoter element motif (termed DOG Box) present upstream in representatives from 26 out of 28 dorsal gland effector families, and predict a putative effector superset associated with this motif. We validate gland cell expression in two novel genes by in situ hybridisation and catalogue dorsal gland promoter element-containing effectors from available cyst nematode genomes. Comparison of effector diversity between pathotypes highlights correlation with plant resistance-breaking.ConclusionsThese G. rostochiensis genome resources will facilitate major advances in understanding nematode plant-parasitism. Dorsal gland promoter element-containing effectors are at the front line of the evolutionary arms race between plant and parasite and the ability to predict gland cell expression a priori promises rapid advances in understanding their roles and mechanisms of action.Electronic supplementary materialThe online version of this article (doi:10.1186/s13059-016-0985-1) contains supplementary material, which is available to authorized users.

Genetic diversity of potato varieties bred in Russia and near-abroad countries based on polymorphism of SSR-loci and markers associated with resistance R-genes

The genetic diversity of potato varieties from the VIR collection was analyzed based on microsatellite analysis. These varieties have been bred in Russia and near-abroad countries since the 1931. Application of 14 highly polymorphic nuclear microsatellites (SSR) enabled the complete discrimination of all 113 varieties. Additionally, we have studied these varieties for the distribution of 8 DNA markers associated with three R-genes involved in the control of resistance to two quarantine objects: the potato wart Synchytrium endobioticum and golden potato cyst nematode Globodera rostochiensis, which occur locally in some regions of the Russian Federation. All the analyzed varieties with resistance to S. endobioticum pathotype 1 revealed the diagnostic marker Nl-251400 of the Sen1 gene and a few susceptible cultivars lost this diagnostic fragment. The tested markers of the H1 and Gro1-4 genes, which confer resistance to G. rostochiensis pathotype Ro1 revealed different predictiveness. In the molecular screening of potato varieties, it is better to use several markers of these genes. Results of molecular screening using six markers of the H1 and Gro1-4 genes allowed us to detect 6 haplotypes in the tested subset. Five haplotypes include varieties with different combinations of the markers tested, the majority (87.9 %) of these varieties were highly resistant or moderately resistant to G. rostochiensis. The most numerous haplotype H1/0 included 76 varieties, which did not possess any marker; 96.1 % of these varieties were susceptible to G. rostochiensis. Predictive associations between haplotype content, wart and nematode resistance, pedigree and ‘variety age’ are discussed.

Identification of potato cyst nematode resistant genotypes using molecular markers

At present the resistant potato cultivars under cultivation do not possess enough resistance to wide range of potato cyst nematode (PCN) pathotypes (Ro1 to Ro5 of Globodera rostochiensis and Pa1 to Pa3 of Globodera pallida). Therefore, development of varieties having resistance against different PCN pathotypes is must however, large scale phenotypic evaluation for PCN is difficult and costly. Identification of resistance genes using DNA markers may be an alternative approach. In the present study, we have evaluated advanced generation breeding material along with five popular varieties grown in the Nilgiris (Kufri Jyoti, Kufri Giriraj, Kufri Girdhari, Kufri Swarna and Kufri Neelima) with known DNA markers for identification of PCN resistance genes (H1 gene against Ro1 and Ro4, Gro 1-4 and GroVI gene against Ro1, Grp1_QTL against Ro5, Pa2,3 and Gpa5 & Gpa6_QTL against Pa2,3). The results revealed that nearly 60% of the breeding lines and varieties tested possessed H1 gene whereas, no genotype was positive for the Gro1-4. The marker TG432 associated with QTL conferring resistance to G. pallida amplified in 24 genotypes. The SNP marker HC was amplified for 40 genotypes and four varieties. For G. pallida, marker SPUD 1636 associated with the QTL Gpa5 and Gpa6 was amplified in four breeding lines and variety Kufri Swarna. Hence, the result of the study will facilitate breeding of novel resistant varieties by efficient selection of ideal genotypes and pyramiding of resistant loci in a single genotype.