Potato Hybrids Research Articles

Selection of potato varieties of various target areas in the conditions of the forest-steppe of the Novosibirsk Obregion

As part of the comprehensive research plan for the implementation of the FNTP subprogram “Development of potato breeding and seed production”, a potato breeding program is being conducted on the basis of the SibNIIRS branch of the ICIG SB RAS in various areas, the main ones are: selection for adaptability, early maturity, high productivity, nematode resistance and suitability for processing into crispy potatoes and fries. The purpose of the study is to study the best hybrids of the nursery of competitive variety testing in various breeding areas. The object of the study was 12 best potato hybrids from the nursery of competitive variety testing. Three varieties were taken as the standard: Yuna, Nevsky and Svitanok Kievsky. The coefficient of adaptability over 1 was noted in 67% of hybrids of the competitive nursery. According to the early harvest, three hybrids that exceeded the standard were distinguished: 2029, 812-5, and 1920/3-1. The average productivity in the years of research over 30 t/ha was noted in 8 hybrids of the competitive nursery: 4797/3-1 (30.4 t/ha), 886/1-4 (30.7 t/ ha), 1-14-1a (31.1 t/ha), 1014/8-1 (32.4 t/ha), 785/8-5 (32.9 t/ha), 2302 (34.6 t/ha), 2029 (36.1 t/ha) and 1920/3-1 (38.7 t/ha). According to the results of the All-Russian potato testing center for resistance to cancer and nematode (VNIIKH, Moscow), 83% of hybrids of the competitive nursery are resistant to golden potato nematode. According to the suitability for processing for crispy potatoes, one highly suitable sample was identified – 2660/1 (8 points). Three highly suitable (8-9 points) hybrids are recommended for processing into French fries: 2681/4, 4797/3-1, 1920/3-1. As a result of the selection of SibNIIRS, two medium-early hybrids were created and submitted for State Testing: 785/8–5 (Alka) from 2022; 1014/8-1 (Nika) – from 2023. The early productivity of the hybrid 1920/3-1 was 64% higher than the early variety-the Yna standard, this sample is being prepared for transfer to the State Variety Testing among the early ripening group called Ataman. This work was supported by IC&G budget project No FWNR-2022-0033.

A genomic variation map provides insights into potato evolution and key agronomic traits.

Hybrid potato breeding based on diploid inbred lines is transforming the way of genetic improvement of this staple food crop, which requires a deep understanding of potato domestication and differentiation. Here, we resequenced 314 diploid wild and landrace accessions to generate a variome map of 47,203,407 variants. Using the variome map, we discovered the reshaping of tuber transcriptome during potato domestication, characterized genome-wide differentiation between landrace groups Stenotomum and Phureja, and identified a jasmonic acid biosynthetic gene possibly affecting tuber dormancy period. Genome-wide association studies revealed a UDP-glycosyltransferase gene for biosynthesis of antinutritional steroidal glycoalkaloids (SGAs), and a Dehydration Responsive Element Binding (DREB) transcription factor conferring increased average tuber weight. In addition, genome similarity and group-specific SNP analyses indicated tetraploid potatoes originated from the diploid S. tuberosum group Stenotomum. These findings shed light on the evolutionary trajectory of potato domestication and improvement, providing a solid foundation for advancing hybrid potato breeding practices.

Leveraging a phased pangenome for haplotype design of hybrid potato.

The tetraploid genome and clonal propagation of the cultivated potato (Solanum tuberosum L.)1,2 dictate a slow, non-accumulative breeding mode of the most important tuber crop. Transitioning potato breeding to a seed-propagated hybrid system based on diploid inbred lines has the potential to greatly accelerate its improvement3. Crucially, the development of inbred lines is impeded by manifold deleterious variants; explaining their nature and finding ways to eliminate them is the current focus of hybrid potato research4-10. However, most published diploid potato genomes are unphased, concealing crucial information on haplotype diversity and heterozygosity11-13. Here we develop a phased potato pangenome graph of 60 haplotypes from cultivated diploids and the ancestral wild species, and find evidence for the prevalence of transposable elements in generating structural variants. Compared with the linear reference, the graph pangenome represents a broader diversity (3,076 Mb versus 742 Mb). Notably, we observe enhanced heterozygosity in cultivated diploids compared with wild ones (14.0% versus 9.5%), indicating extensive hybridization during potato domestication. Using conservative criteria, we identify 19,625 putatively deleterious structural variants (dSVs) and reveal a biased accumulation of deleterious single nucleotide polymorphisms (dSNPs) around dSVs in coupling phase. Based on the graph pangenome, we computationally design ideal potato haplotypes with minimal dSNPs and dSVs. These advances provide critical insights into the genomic basis of clonal propagation and will guide breeders to develop a suite of promising inbred lines.

Diploid inbred-based hybrids: fast-forward breeding approach in potatoes.

Following the identification of the self-compatibility gene (Sli) in diploid potatoes two decades ago, the breeding of inbred based diploid hybrid potatoes made its way. Tetraploid potatoes have a long history of cultivation through domestication and selection. Tetrasomic inheritance, heterozygosity and clonal propagation complicate genetic studies, resulting in a low genetic gain in potato breeding. Diploid hybrid TPS potato breeding, similar to the developments in hybrid maize, was pursued as an alternative to the genetic improvement of potatoes. However, several challenges, like self-incompatibility and high inbreeding depression associated with diploid potatoes, must be overcome to develop inbred lines in potatoes. Moreover, the inbred lines must retain good fertility and vigour for hybrid breeding. Good progress has been made by creating di-haploids of popular varieties, mapping self-incompatibility inhibitor gene, understanding the genetic basis of inbreeding depression, and identifying genomic regions for deleterious alleles and fertility. Further, the genome sequencing of diploid inbred lines has revealed the genetics of key traits associated with potato breeding. This article discussed these insights and summarized the progress of diploid hybrid TPS potato breeding. Recent advances in genetic and genomic research and genome editing technology have shown promise for this technology's success and far-reaching implications.

ГЕНЕТИЧЕСКИЙ СКРИНИНГ ПЕРСПЕКТИВНЫХ ГИБРИДОВ КАРТОФЕЛЯ РЕСПУБЛИКИ КОМИ

The studies were conducted with the aim of genetic screening of promising selection hybrids of potatoes to identify genotypes resistant to a complex of phytopathogens. The study was carried out at A.V.Zhuravskiy Institute of Agrobiotechnology of Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences and Sintol company (Moscow) using the GenExpert reagent kit “Markers of potato resistance genes” (“Syntol”). For the study, 10 markers of genes encoding resistance to potato cancer, golden potato cyst nematode, pale potato cyst nematode, X-virus and Y-virus were selected (genes H1, Gro1-4 were detected using markers TG-689, 57R, N195 and Gro1-4-1, gene Sen1 – using marker NL25, gene Gpa2 – Gpa2-2). The objects of the study were leaves of plants of five potato hybrids undergoing selection testing in breeding nurseries: 2341-265 (Amur × Gala), 2339-8 (Oksania × Gala), 2339-9 (Oksania × Gala), 1992-14 (Udacha × Elmundo), 2000-60 (Colette × FZ 1867). The maximum number of markers (five in each) linked to resistance genes was revealed in samples 2339-8 and 1992-14: TG-689, 57R, N195 and NL25 in both hybrids; Gro1-4-1 marker in 2339-8 and Gpa2-2 in 1992-14. Only the marker of potato wart resistance gene, NL25, was noted in selection number 2341-265. Sample 2339-8 was characterized as a valuable source of R-genes, having in its genome the genes of resistance to golden potato cyst nematode (H1, Gro1-4) and potato wart (Sen1). The genotype of the 1992-14 hybrid, carrying the Gpa2 gene, is recommended for breeding new potato varieties resistant to various types of nematodes.

Analysis of hybrid potato populations in the conditions of the Magadan region

The priority direction in potato breeding in the Magadan region, given the short growing season and heat shortage, is the creation of predominantly early-ripening potato varieties. The article presents the results of the evaluation of potato breeding samples in terms of productivity and ripeness. Over two years, about three thousand samples of 67 hybrid combinations have been studied. The research was carried out in 2022–2023 on the experimental field of the Magadan Scientific Research Institute of Agriculture on floodplain, sod-alluvial, pebble-sandy loam soils. More than two thousand samples represented by 25 hybrid combinations were studied in the nursery of seedlings. Hybrid combinations characterized by a high frequency of selection of promising forms are identified, such as Arctica × Elbeida, Udacha × Bellarosa, Krone × Bellarosa, Charoite × Bellarosa, Krone × Labadia, Arctica × Gala. In these hybrid combinations, from 7.6 to 17.9% of the samples from the total number of the seedlings planted in the field were selected as clones. The samples with high productivity indicators were selected in the nursery of hybrids of the 1st year. The maximum weight of tubers of one plant was noted in the populations of Columba × Krepysh – 2010, Udacha × Bellarosa – 1820, Arctica × Elbeida – 1825, Charoite × Bellarosa – 1800. In the nursery of hybrids of the 2nd year, hybrids with productivity exceeding 1000 g/bush, such as Columba × Krepysh (2700 g/bush), Udacha × Bellarosa (1950 g/bush), Arctica × Krepysh (1670 g/bush), were identified in terms of yield and economically valuable characteristics. The frequency of selection of productive clones here exceeded 50%. These hybrid combinations are recommended for breeding research in the conditions of the Magadan region.

Test results of new breeding potato hybrids in the conditions of the Volga-Vyatka region

In the period from 2016 to 2022 in the conditions of the Kirov region, an assessment of hybrid potato combinations was carried out according to the most important traits - high productivity and yield, marketable and consumer qualities of tubers. New potato hybrids bred by the Falenki Breeding Station – branch of the FARC North-East were used as the objects of the research: 6-17 (‘Gornyak’ x ‘Manifest’); 15-17 (428-05 x ‘Manifest’); 33-17 (132-07 x ‘Manifest’); 72-17 (‘Gornyak’בIrbitsky’); 78-17 (‘Udacha’ x 428-05); 120-17 (‘Utyonok’בReggi’); 25-16 (‘Kupalinka’ x 428-05). They were noted as the most promising ones according to the results of the research of 2016-2022. The medium-early ‘Nevsky’ cultivar approved for use in the Kirov region was used as a standard. According to the methodological guidelines of the potato breeding process, phenological observations, productivity assessment (on day 65), total and commercial yields were carried out in the nursery, and the chemical composition of tubers was determined. As a result, on average, over three years of testing for a complex of economically valuable traits, a promising breeding number 33-17 was identified – a significant excess of the total yield (29.9 t/ha) over the standard ‘Nevsky‘ cultivar was 14.6 t/ha. The tubers are oval with a red, slightly reticulated skin, the eyes are small, unpainted, the flesh is white. In addition, when evaluating the productive capabilities of potato hybrids, the coefficient of adaptability of breeding number 33-17 was 1.40, which makes it possible to recommend it for cultivation in this region in order to obtain stable yields.

Bed, ridge and planting configurations influence crop performance in field-transplanted hybrid potato crops

Bed, ridge and planting configurations influence crop performance in field-transplanted hybrid potato crops

Branching response to stem density and its impact on yield in hybrid potato grown from true seeds and seedling tubers

Branching response to stem density and its impact on yield in hybrid potato grown from true seeds and seedling tubers

Identification, Elucidation and Deployment of a Cytoplasmic Male Sterility System for Hybrid Potato.

Recent advances in diploid F1 hybrid potato breeding rely on the production of inbred lines using the S-locus inhibitor (Sli) gene. As a result of this method, female parent lines are self-fertile and require emasculation before hybrid seed production. The resulting F1 hybrids are self-fertile as well and produce many undesirable berries in the field. Utilization of cytoplasmic male sterility would eliminate the need for emasculation, resulting in more efficient hybrid seed production and male sterile F1 hybrids. We observed plants that completely lacked anthers in an F2 population derived from an interspecific cross between diploid S. tuberosum and S. microdontum. We studied the antherless trait to determine its suitability for use in hybrid potato breeding. We mapped the causal locus to the short arm of Chromosome 6, developed KASP markers for the antherless (al) locus and introduced it into lines with T and A cytoplasm. We found that antherless type male sterility is not expressed in T and A cytoplasm, proving that it is a form of CMS. We hybridized male sterile al/al plants with P cytoplasm with pollen from al/al plants with T and A cytoplasm and we show that the resulting hybrids set significantly fewer berries in the field. Here, we show that the antherless CMS system can be readily deployed in diploid F1 hybrid potato breeding to improve hybridization efficiency and reduce berry set in the field.

Yield performance and anthocyanin content of several purple-fleshed sweet potato clones grown in two locations in East Nusa Tenggara, Indonesia

Abstract. Arsa IGBA, Mau YS, Ndiwa ASS, Gandut YRY, Ishaq LF, Mahayasa INW. 2024. Yield performance and anthocyanin content of several purple-fleshed sweet potato clones grown in two locations in East Nusa Tenggara, Indonesia. Biodiversitas 25: 2276-2289. Several promising purple-fleshed sweet potato hybrid clones were identified to have high yield potential and, thus, can be evaluated for other superior traits and later be further processed for varietal registration and release. This study aimed to determine the tuber yield performance and anthocyanin content of several purple-fleshed sweet potato clones across two locations and to identify the best clones based on mean performance and stability. The study was conducted in the farmer's field in two different altitudes in West Timor, i.e., Mata Air Village, Kupang District (86 masl) and Netpala Village, Timor Tengah Selatan (TTS) District (1,090 masl) from April to September 2023. Six purple-fleshed sweet potato clones/varieties were assigned as treatment. The experiment was laid out in a complete block design in each location, and each treatment consisted of three replicates. Observed data included fresh storage root yield, number of storage roots per plant, storage root length, storage root tuber diameter, and tuber anthocyanin content. Observed data from the two trial locations were subjected to a combined ANOVA, cluster analysis, Principal Component Analysis (PCA), and GGE biplot analysis. The results showed that the genotype-by-location interaction effect was significant in all studied traits. Meanwhile, location or genotype significantly affected all traits except for the location, which did not significantly affect the anthocyanin content. The storage root yield ranged from ~19.95 t ha-1 to ~49.33 t ha-1, while the anthocyanin content ranged from ~28,64 mg/100 g to ~157,65 mg/100 g. The ranks of the tested genotypes based on the mean performance and stability are Undana UJ 7>Undana UJ 1>JPV-1>Antin 3>Undana UJ 6>Undana UJ 3 for storage root yield and JPV-1>Antin 3>Undana UJ 7>Undana UJ 6>Undana UJ 3>Undana UJ 1 for anthocyanin content.

Promising potato hybrids in Siberia

The results of studying potato hybrids in the nurseries of preliminary and competitive variety trials are presented. The research was conducted in 2018–2022 in the Krasnoyarsk Territory in grain and fallow crop rotation. The soil of the experimental plot is represented by leached chernozem, low- and medium-moist heavy loam of granulometric composition. Experiment design, yield recording and data processing were carried out in accordance with the generally accepted recommendations for work with the crop. Based on the Selyaninov hydrothermal coefficient, the weather conditions of the vegetation periods of the years of research can be characterized as slightly arid. The HTC was 1.1 in 2019 and 2021, in 2020, 2022 – 1,3. According to the results of the preliminary variety trials, lines A-114, A-326, A-529, A-635a exceeded or were at the level of the standard variety Krasnoyarsky Ranniy by the number of marketable tubers and yield. During 4 years of research in the nursery of competitive varietal trial, the studied breeding lines on average formed yields at the level or higher than the standard varieties. According to the elements of the yield structure in the competitive variety trial lines A-114, A-529 significantly exceeded the standard variety in marketability, as well as had a smaller number and weight of unmarketable tubers. Based on the results of the evaluation in 2019–2021 of the chemical composition of tubers for dietary and functional food, lines with low starch content (up to 14%) are proposed: A-114 (12.2%), А-672а (9.9), А-635а (12.7%). Based on the study in 2019–2022 of the line A-114 in competitive trials, preliminary and production multiplication, ecological assessment, application materials for admission to use and protection of the new potato variety Akrux were submitted to the State Variety Commission.

Influence of different doses of mineral fertilizers on yield and quality indicators of promising potato hybrids

Influence of different doses of mineral fertilizers on yield and quality indicators of promising potato hybrids

The study of potato hybrids in the Kola North

The article presents data on the study of potato varieties (2020–2022) in the Murmansk region on the basis of an integrated scientific research institution Murmansk State Agricultural Experimental Station – a branch of the VIR. In the trial dig, the hybrid 211/1 was isolated, which exceeded in all main indicators (yield, marketability, mass of tubers from one bush, mass of one tuber) the standard sample – the most adapted to the conditions of the Kola North (variety Elizabeth). There were good results in the main cleaning in terms of marketability: in 2020: hybrid 211/1 – 98.9%, hybrid 114/11 – 98.6, hybrid 2103/7 – 99.4, hybrid 211/9 – 99.4%; in 2021. – 211/1 – 98,1, 114/11 – 96,3, 2103/7 – 98,4, 211/9 – 99,1%; in 2022. -211/1 – 99,5, 114/11 – 99,8, 2103/7 – 99,2, 211/9 – 99%. In 2020 and 2021, the hybrid 211/1 stood out among the other four in terms of yield, marketability, weight of tubers from one bush, weight of one tuber. In 2022, hybrids 114/11 and 211/9 had the best yields. The mass of one tuber in the main harvest in 2022 for the hybrid 114/11 is 126.3 g (more than the standard). According to the maturation time, all samples are close to the standard. According to the research results, the most adapted hybrid 114/11 can be recommended to the population of the northern region.

Breeding value of potato hybrid clones from the VIR collection revealed in the environments of Kamchatka Territory

Background. Potato breeding involves planned artificial hybridization between previously selected parental lines. A way to make potato breeding more efficient is to use the diversity of the germplasm and broaden the gene pool of parental lines. Interspecific potato hybrids originated on the elite potato germplasm display a set of valuable traits. The current challenge is to assess the performance of potato hybrids under specific soil and climate conditions to clarify their breeding value.The objective of the study was to evaluate potato hybrids in the environments of Kamchatka Territory according to a set of traits, identify the best parental lines, develop new hybrid combinations, and select promising breeding material.Materials and methods. Eleven potato hybrids from VIR were studied over three years (2020–2022) in the fields of Kamchatka Research Institute of Agriculture. The hybrids were benchmarked against two reference potato cultivars, ‘Fresco’ and ‘Vulkan’, belonging to the early and mid-early maturity groups, respectively. Crosses between the hybrids and 28 potato cultivars were carried out in the greenhouse. The new hybrid material was tested in a preliminary trial nursery for yield and earliness.Results. Hybrid 117-2 was better in yield (899 g/plant) than cvs. ‘Vulkan’ and ‘Fresco’ (700–739 g/plant). Hybrids 94-5, 99-10- 1, 8-1-2004, 8-3-2004, 8-5-2004, 135-3-2005, 135-5-2005, 99-6-6, and 134-2-2006 in most traits matched the potato cultivars, manifesting good berry formation and seed setting when crossed. Out of 140 crosses between 11 hybrids and 28 cultivars, 35 crosses between 10 hybrids and 13 cultivars were successful. Most hybrids were effectively used in crossings as maternal forms.Conclusion. VIR’s hybrids 94-5, 8-1-2004, and 8-5-2004 proved the most promising as source material for the development of new early potatoes under the conditions of Kamchatka Territory.

Studying anthocyanins in the skin and flesh of the tubers of some potato hybrids (<i>Solanum tuberosum</i> L.)

Relevance. Today special attention is paid to potato anthocyanins as components of functional food. Increasing interest is generated by research on the use of anthocyanins for the benefit of animals and people in addition to their significant role in the life of plants. The research goal was to identify the quantitative and qualitative composition of anthocyanins in the tubers of valuable potato hybrids of Primorsky selection. Five promising potato hybrids (Solanum tuberosum L.) belonging to different groups of maturity and involved in the comparative variety testing by FSBSI “FSC of Agricultural Biotechnology named after A. K. Chaiki” were used as the research object. The research was carried out under the conditions of field and laboratory experiments in Primorsky kray, Russia, in 2018-2023. The anthocyanins were divided by the method of high-performance liquid chromatography. The anthocyanins were identified by the method of second-order mass spectrometry. Results. The research evaluated the potato hybrids for the content of anthocyanins in the tissues of the tubers – skin and flesh. The following specimens were determined to have a high content of anthocyanins both in the skin and flesh: Pri-15-12-14 (petunidin-3-arabinoside: 310.0 and 91.1 mg/kg; cyanidin-3-glucoside: 149.8 and 39.8 mg/kg) and Pri-14-52-2 (petunidin-3-arabinoside: 360.0 and 143.0 mg/kg; cyanidin-3-glucoside: 80.4 and 81.2 mg/kg). The selected specimens were characterized by purple and blue-purple skin. Genotypes Pri-14-52-2 and Pri-15-12-14 had tuber flesh with purple pigmentation. Hybrids Pri-15-12-14 and Pri-14-52-2 had the highest total content of anthocyanins in the flesh – 130.9 and 224.2 mg/kg, respectively. The conducted research identified eight different anthocyanins in the tubers of the studied potato specimens: delphinidin-3-glucoside, delphinidin-3-ramnosil-5-glucoside, petunidin-3-glucoside, malvidin-3-glucoside, cyanidin-3-glucoside, cyanidin-3-ramnosil-5-glucoside, pelargonidin-3-glucoside, and petunidin-3-arabinoside. The tubers with pink and red skin were determined to contain pelargonidin-3-glucoside. Petunidin-3-glucoside and cyanidin-3-glucoside colored tuber skin purple. The selected group of specimens might be recommended for use as functional food and in goal-oriented breeding.

Оценка устойчивости перспективных гибридов цветного картофеля к фитофторозу

Abstract. Potatoes with pigmented tubers contain anthocyanins and other phenolic compounds that demonstrate antioxidant activity and have a beneficial effect on human health. The nutritional value and other consumer qualities of available potato varieties must be combined with resistance to various infections, primarily late blight, which leads to significant yield losses and considerable costs for chemical protection. The purpose of this work was to assess late blight resistance of 46 promising potato hybrids with different pigmentation patterns, both in the field and by laboratory methods, including molecular screening. The objectives of this study included obtaining promising hybrids of colored potatoes characterized by a set of economically importatnt traits, laboratory and field assessment of the resistance of leaves and tubers to the late blight pathogen Phytophthora infestans, as well as molecular screening of late blight resistance gene markers (Rpi genes). The production, cultivation and evaluation of the hybrid material was carried out using standard methods. Field and laboratory resistance of leaves and tubers was assessed on a 9-point scale. Molecular screening was carried out using PCR analysis. The scientific novelty of the work lies in the fact that for the first time a comprehensive assessment of the resistance to late blight of hybrid material of colored potatoes obtained on the territory of Russian Federation was carried out. According to the results obtained, the studied samples demonstrated a high level of resistance of tubers and leaves in field conditions and laboratory tests. However, the results of the study did not reveal a relationship between laboratory or field resistance and the presence of Rpi gene markers, which may be due to the influence of many independent factors that determine horizontal resistance.

Opening Eyes on Seedling Tuber Quality in Potato: Size Matters

For potato, diploid hybrid breeding is a novel breeding technique that speeds up the development of new varieties. A consequence of hybrid breeding is the introduction of hybrid true potato seeds as starting material. From these seeds, seedling tubers can be produced in one field season, to use as starting material for a seed or a ware crop in the following year. For breeding purposes as well as for seed crop and ware crop production, it is essential to produce seedling tubers of high quality. The production of seedling tubers is a new step in the potato production chain; therefore, we investigated the effect of tuber quality traits on plant development and yield. With similar seedling tuber weight, more eyes per seedling tuber led to more stems per plant. This was compensated by a lower number of tubers per stem resulting in an equal total tuber number and weight per plant at the end of the growing season. A higher seedling tuber weight led to a higher soil cover in the field. Hybrid potato plants grown from larger seedling tubers produced a greater total tuber weight per plant than plants grown from smaller tubers, while number of eyes and stems per tuber had no effect on final yield when using equal seedling tuber weight.

Study of potato variety numbers in the breeding process in the northern regions of Russia

In the conditions of the Arkhangelsk region in the nurseries of the breeding process the study of potato hybrids was carried out and the varieties with high yield, resistance to pathogens and various environmental factors were selected. In 2019, 759 hybrid samples of 9 populations were received from the breeding department of the All-Russian Research Institute of Potato Farming by A.G.Lorh with further study and selection of the best of them in the nurseries of the breeding process: hybrids of the 1st and 2nd year, preliminary and main trials of the 1st year. As a result of research and complex evaluation in the nursery of the main trial of the 1st year in the first dynamic digging (60 days after planting) in the group "medium early" hybrid 2553/1 stood out on the total and marketable yield exceeding the standard variety Kholmogorsky by 2.4 times, in the main harvest – only by 11%. In the group "medium early" in the main harvesting hybrid 2553/4 stood out exceeding the standard variety Elizaveta on the total yield by 7.4 t / ha, on marketable – by 3.2 t / ha. High total and marketable potato yields in the main harvest were obtained in sample 2462/3 (44.3 and 42.5 t/ha, respectively). Observations of potato plants during vegetation periods showed that no clone was affected by rhizoctoniose, microsporiosis and viral diseases. High resistance to late blight of potato hybrids in the first observation period and decrease of its resistance to the end of the vegetation period, before removal of haulm, was also revealed. This is probably due to low air temperature and significant precipitation during this period. Selection samples that showed high productivity and resistance to major diseases will be studied in further breeding process in order to create new varieties for cultivation in the conditions of northern regions of Russia.

Resistance of potato hybrids to viral and fungal diseases in the conditions of the North Caucasus region

Resistance of potato hybrids to viral and fungal diseases in the conditions of the North Caucasus region