Testing of potato (Solanum tuberosum) wart disease resistance on infection background of fungus Synchytrium endobioticum with vegetation experimental research in quarantine lysimeters was realized in the conditions of the Republic of Belarus in 2006-2010. The experiment was realized on infection background of fungus Synchytrium endobioticum in ground on susceptible to disease breed Voltman. It is shown that a basis of potato protection against wart disease (Synchytrium endobioticum (Schilb.) Perc.,) is created by resistant varieties. There was marked the importance of selection of material immunological evaluation for wart disease resistance (pathotype D1), providing with the creation of local potato varieties with the given sign in Belarusian breeding programs. It was determined that by zoosporangium powder application, the fungus infection ability reproduced on sensitive varieties and hybrids can be changed with the expression of different parasite aggressively. There was set that strategic basis of potato wart disease Synchytrium endobioticum protection is disease-resistant breeds. In accordance with preliminary (first and second years) findings test number of potato exemplars from breeding offices of the Republic of Belarus and Russian Federation, which were resistant to potato wart disease pathotype D1, was 84,0% average in 2006-2010; result of state testing – 92,4%. Infection ability of fungus Synchytrium endobioticum, which was reproduced on amenable breeds and hybrids, can be changed with expression of different pathogene aggressivity. Results of assessment to potato wart disease persistence were used by plant breeders during creation of breeds Ragneda, Uladar, Yanka, Vektar, Zorachka.

Background The cultivated potato (Solanum tuberosum L.) is an important food crop, but highly susceptible to many pathogens. The major threat to potato production is the Irish famine pathogen Phytophthora infestans, which causes the devastating late blight disease. Potato breeding makes use of germplasm from wild relatives (wild germplasm) to introduce resistances into cultivated potato. The Solanum section Petota comprises tuber-bearing species that are potential donors of new disease resistance genes. The aim of this study was to explore Solanum section Petota for resistance genes and generate a widely accessible resource that is useful for studying and implementing disease resistance in potato. Description The SolRgene database contains data on resistance to P. infestans and presence of R genes and R gene homologues in Solanum section Petota. We have explored Solanum section Petota for resistance to late blight in high throughput disease tests under various laboratory conditions and in field trials. From resistant wild germplasm, segregating populations were generated and assessed for the presence of resistance genes. All these data have been entered into the SolRgene database. To facilitate genetic and resistance gene evolution studies, phylogenetic data of the entire SolRgene collection are included, as well as a tool for generating phylogenetic trees of selected groups of germplasm. Data from resistance gene allele-mining studies are incorporated, which enables detection of R gene homologs in related germplasm. Using these resources, various resistance genes have been detected and some of these have been cloned, whereas others are in the cloning pipeline. All this information is stored in the online SolRgene database, which allows users to query resistance data, sequences, passport data of the accessions, and phylogenic classifications. Conclusion Solanum section Petota forms the basis of the SolRgene database, which contains a collection of resistance data of an unprecedented size and precision. Complemented with R gene sequence data and phylogenetic tools, SolRgene can be considered the primary resource for information on R genes from potato and wild tuber-bearing relatives.

Potato late blight caused by the fungus Phytophthora infestans is the most important disease in the world. Developing potatoes resistant to late blight is a major breeding effort around the world. International Potato Center (CIP) developed a potato population with durable resistance to late blight. These clones (B3C1) were bred in Peru under short-day conditions, growing in long-day conditions such as Korea is not feasible. The purpose of this study was to evaluate late blight resistance and major agronomic characteristics of CIP’s breeding lines, and agronomic potential of segregating progeny from B3C1 under long-day conditions in Korea. Late blight resistance of B3C1 clones was evaluated in naturally infested fields. AUDPC (Area Under Disease Progress Curve) values of all B3C1 clones were significantly lower than those of control varieties Atlantic and Haryeong, indicating B3C1 clones have high levels of resistance. However, most of the B3C1 clones had lower tuber yield compared to control cultivars, presumably due to differences in adaptability to long-day conditions. Two clones, 381580.30 and 392635.54 were susceptible to common scab (Streptomyces scabies) and 384398.56 and 393382.44 had a high percentage of tuber disorders. Four clones, including 391047-34, had relatively high marketable yield, high specific gravity, and desirable agronomic characteristics. To develop clones highly resistant to late blight and with good adaptability in long-day condition, B3C1 clones were crossed with Korean breeding lines. Through individual selection for several years, 25 clones were selected as promising lines with good agronomic characteristics and high resistance to late blight.

The main priorities for breeding new Indian potato cultivars include enhancement of tuber yield, their stable perfonnance and disease resistance. Yield, acomplex polygenic trait is greatly influenced by non...additive and additive gene actions and high genotype x environment (G x E) interaction.................

<p>Abstract</p> <p>Background</p> <p>The cultivated potato (<it>Solanum tuberosum </it>L.) is an important food crop, but highly susceptible to many pathogens. The major threat to potato production is the Irish famine pathogen <it>Phytophthora infestans</it>, which causes the devastating late blight disease. Potato breeding makes use of germplasm from wild relatives (wild germplasm) to introduce resistances into cultivated potato. The <it>Solanum </it>section <it>Petota </it>comprises tuber-bearing species that are potential donors of new disease resistance genes. The aim of this study was to explore <it>Solanum </it>section <it>Petota </it>for resistance genes and generate a widely accessible resource that is useful for studying and implementing disease resistance in potato.</p> <p>Description</p> <p>The Sol<it>R</it>gene database contains data on resistance to <it>P. infestans </it>and presence of <it>R </it>genes and <it>R </it>gene homologues in <it>Solanum </it>section <it>Petota</it>. We have explored <it>Solanum </it>section <it>Petota </it>for resistance to late blight in high throughput disease tests under various laboratory conditions and in field trials. From resistant wild germplasm, segregating populations were generated and assessed for the presence of resistance genes. All these data have been entered into the Sol<it>R</it>gene database. To facilitate genetic and resistance gene evolution studies, phylogenetic data of the entire Sol<it>R</it>gene collection are included, as well as a tool for generating phylogenetic trees of selected groups of germplasm. Data from resistance gene allele-mining studies are incorporated, which enables detection of <it>R </it>gene homologs in related germplasm. Using these resources, various resistance genes have been detected and some of these have been cloned, whereas others are in the cloning pipeline. All this information is stored in the online Sol<it>R</it>gene database, which allows users to query resistance data, sequences, passport data of the accessions, and phylogenic classifications.</p> <p>Conclusion</p> <p><it>Solanum </it>section <it>Petota </it>forms the basis of the Sol<it>R</it>gene database, which contains a collection of resistance data of an unprecedented size and precision. Complemented with <it>R </it>gene sequence data and phylogenetic tools, Sol<it>R</it>gene can be considered the primary resource for information on <it>R </it>genes from potato and wild tuber-bearing relatives.</p>

"In this volume, world leaders in potato research review historical and contemporary discoveries resulting in a range of advances. Topics include nutritional quality, yield, disease and insect resistance, processing, plant growth and development, and other aspects. The book also examines research yielding significant molecular resources that facilitate breeding, linkage and gene mapping, cytology, functional and structural genomics, proteomics, and metabolomics. Future research developments that are likely to significantly advance efforts to understand and improve the potato are also explored. "--Publisher.

Potato late blight caused by the fungus Phytophthora infestans is one of the most vital diseases damaging the potato plant. It is for this reason that breeding potato cultivars resistant to late blight is now becoming a major concern around the world. The B3C1 clones has been introduced by the Highland Agriculture Research Center, RDA. The clones which came from International Potato Center in 2005 have a durable resistance to late blight. The clones were bred under a short-day condition in Peru. However, there was still no report on the adaptability of these clones to the long-day condition in Korea. Therefore, this study was conducted to evaluate the late blight resistance and major agronomic characteristics of B3C1 clones under Korea's long-day condition. This study was also done to generate genetic resources for developing new varieties resistant to late blight. In this study it was found out that in naturally infested field with P. infestans, AUDPC (area under disease progress curve) values of all B3C1 clones were significantly lower than those of the control varieties, 'Superior', 'Atlantic', and 'Haryeong'. It was found out that B3C1 clones had a high level of resistance to late blight and that they could be used as genetic resources to breed potato varieties with late blight resistance. However, several undesirable characteristics such as extremely late maturity, excessive growth of stems and stolons, and production of tubers that cannot easily be removed from the stolons were also observed. Among the twenty B3C1 clones, two clones, LB-8 (CIP393077.159) and LB-11 (CIP393371.159), were selected for cultivating at the highland area of Korea. Two B3C1 clones were crossed with Korean breeding lines and clonal selection for the progenies is still in progress.