Resistance of potato clones to necrotic recombinant strains of potato virus y (pvy)

Abstract

The Ry adg allele is widely used by breeders to confer extreme resistance to all strains of PVY. However, the necrotic strain has increased recombination resulting in recent considerable losses in productivity. Thus far, not all necrotic recombinant strains of PVY have been tested for their reaction to the Ry gene. The objective of this study was to identify potato clones carrying the resistant allele and to assess their reaction to the following recombinant strains: NTN (PVY NTN), Wilga (PVY N-Wi), and "curly top" (PVY E). Advanced clones from the potato breeding program at Universidade Federal de Lavras were evaluated through a specific molecular marker for the Ry adg allele. The clones carrying the resistance allele were grafted on tobacco plants infected with necrotic recombinant strains of PVY. The clones carrying the allele for resistance to PVY were not infected with any of the recombinants during the grafting test. These results confirm that resistance to necrotic recombinant strains has not yet been overcome and that the Ry adg allele also confers resistance to the three recombinant strains tested.

Interspecific potato hybrids as donors of durable resistance to pathogens

“…Сочетание (пирамидирование) генов разной специфичности у сорта Sarpo Mira делает его высокоустойчивым к возбудителю фитофтороза (Rietman et al, 2012). Ген Ryadg, привнесенный от S. andigenum, контролирует иммунитет ко всем штаммам YBK, в том числе новым рекомбинантным формам PVY NTN , PVY N-Wi (Rodrigues de Paula et al, 2014). Вопрос о происхождении этих генов пока не выяснен, но о появлении множествен-ной устойчивости к патогенам у гибридных клонов, не отселектированных по данному признаку, сообщают и другие исследователи (Jansky, Rouse, 2003).…”

Allele dosage of PVY resistance genes in potato clones using molecular markers

“…According to Ribeiro et al (2014), the marker RYSC3 is the most efficient for the selection of PVY resistant clones, since the marker is within the coding region of the gene Ry. However, results found in this study suggest that both markers should be used in the assisted selection for resistance to PVY in a population with S. tuberosum spp.…”

“…This resistance is controlled by major genes with dominance effect, the Ry genes, which confer extreme resistance to PVY (Ribeiro et al 2014). These genes were identified in Solanum tuberusum ssp.…”

РАЗРАБОТКА НОВЫХ СИСТЕМ ПЦР-ИДЕНТИФИКАЦИИ НЕКАРАНТИННЫХ ПАТОГЕНОВ КАРТОФЕЛЯ (Solanum tuberosum L.), РАСПРОСТРАНЕННЫХ НА ТЕРРИТОРИИ РОССИИ

“…В то же время идентифицированы вызывающие КНКК изоляты, которые обладают серологическими свойствами, характерными для ординарного штамма Y-вируса картофеля (PVY O ). Эти штаммы, выделенные в Европе, отнесены к подгруппе PVY N-Wilga некротических штаммов (по названию сорта, на котором впервые выявлен вирус с подобными свойствами) (8)(9)(10). Группа изолятов PVY с аналогичными свойствами, обнаруженных позднее в Северной Америке, получила обозначение PVY N:O (11).…”