The sharka disease produced by plum pox virus, is one of the most important problems-of Prunus culture in Europe. In the case of apricot culture, this is aggravated because of the high susceptibility of European cultivars and the velocity of the disease spreading. Actually, genetic resistance is the only definitive solution and it is the main objective for breeders. Apricot susceptibility to plum pox virus has been investigated for many years and resistance to the virus has been observed in some American cultivars, in Greece. In order to optimize breeding programmes, an approach of the involved resistance mechanisms has been performed. Eight apricot cultivars were selected because of their different level of susceptibility to virus in field. Grafted onto healthy susceptible rootstock (Manicot apricot) they were inoculated by grafting or by aphids (Myzus persicae Sulzer). Symptoms, ELISA-DAS test and utilization of the biological indicator GF305 were used to characterize plant susceptibility. The resistance of cultivars to let aphids taking off viruses from infected tissues (acquisition) has been proved. Large differences were observed among varieties. This mainly concerns the percentage of infected plants by chip or aphids, the localization and velocity in apparition of symptoms, and the acquisition efficiency.
Preliminary studies on the mechanisms involved in Plum Pox Virus apricot resistence
MATERAZZI, ALBERTO;
1995-01-01
Abstract
The sharka disease produced by plum pox virus, is one of the most important problems-of Prunus culture in Europe. In the case of apricot culture, this is aggravated because of the high susceptibility of European cultivars and the velocity of the disease spreading. Actually, genetic resistance is the only definitive solution and it is the main objective for breeders. Apricot susceptibility to plum pox virus has been investigated for many years and resistance to the virus has been observed in some American cultivars, in Greece. In order to optimize breeding programmes, an approach of the involved resistance mechanisms has been performed. Eight apricot cultivars were selected because of their different level of susceptibility to virus in field. Grafted onto healthy susceptible rootstock (Manicot apricot) they were inoculated by grafting or by aphids (Myzus persicae Sulzer). Symptoms, ELISA-DAS test and utilization of the biological indicator GF305 were used to characterize plant susceptibility. The resistance of cultivars to let aphids taking off viruses from infected tissues (acquisition) has been proved. Large differences were observed among varieties. This mainly concerns the percentage of infected plants by chip or aphids, the localization and velocity in apparition of symptoms, and the acquisition efficiency.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
