Solanum stoloniferum and S. tarnii as resistance sources of the NTN strain of potato Y potyvirus (PVYNTN)
2001
Horvath, J. | Takacs, A. | Kazinczi, G. (Veszprem Univ., Keszthely (Hungary). Georgikon Agricultural Sciences Fac.)
Potato is one of our most important crop because of its rule supplying with food. Out of the cultivated plants potato has the most pathogens. Potato Y potyvirus (PVY) is the type member of potyvirus genus of Potyviridae family, which constitutes the largest known and economically most important family of plant viruses. A new strain of PVY, which produces severe necrotic ring symptoms on potato tubers was isolated at the first time by Beczner et al. (1982) in Hungary. This strain belongs to the tobacco veinal necrosis strain group. The new strain was named by Horv th (1992) which was accepted by the Virology Section of EAPR (European Association for Potato Research). The acronym of this new strain is: PVY(N(ew) T(uber) N(ecrosis))=PVYNTN. The potato tuber necrotic ringspot disease (PTNRD) is identified by superficial bows and rings around the eyes, first protruding, later becoming sunken and necrotic. Furthermore PVYNTN is suspected to overcome field resistance of numerous potato cultivars therefore, this is a resistance breaking strain of PVY. This virus strain became distributed throughout Europe and other parts of the word. The identification of resistance sources is of great importance, therefore experiments were carried out with wild Solanum species for determining their susceptibility or resistance to NTN strain of PVY. The objective of the study was to identify potential resistance sources among the wild Solanum species that could be used in the potato breeding program. We have studied more than 100 wild Solanum species and accessions to PVYNTN. It was found some resistance species and accessions. Currently potato cultivars, resistant to PVY are derived from S. stoloniferum (e.g. 'Szignal'). Out of the resistance species some accessions of Solanum stoloniferum and S. tarnii could be used in the potato breeding. They were immune to the PVYNTN infection.
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