Occurrence of a new resistant breaking pathotype of Meloidogyne incognita on tomato in Greece

Abstract

In a pot assay, a population of Meloidogyne incognita from Northern Greece, reproduced on the resistant tomato cv. Silvana carrying the Mi gene and on three susceptible pepper cultivars. Its ability to reproduce on the resistant tomato and on pepper cv. California Wonder was sustainable for several generations. Till now, the only resistant breaking population of M. incognita on resistant tomato found in Greece was a distinct one from Crete which did not reproduce on susceptible pepper cultivars. Thus, the population of M. incognita from Northern Greece represents a new type of a resistant breaking pathotype, reported for the first time in the country, and a potential threat for both resistant tomato crops and susceptible peppers in the field.

Response of heat-stable tomato genotypes to Mi-1 virulent root-knot nematode populations

“…The number of egg mass and gall rating of M. incognita virulent isolates was not statistically significant on all tested plants (P≤0.05) (Table 6, 7). Occurrence of virulent root-knot nematode populations has been reported in different regions of the world (Tzortzakakis & Gowen, 1996;Roberts & Thomason, 1989;Ornat et al, 2001;Tzortzakakis et al, 2005). In Turkey, a preliminary study was carried out on presence of virulent root knot nematode population in the West Mediterranean region, and results indicated the virulent M. incognita and M. javanica populations were found 11.7% and 21.4% depending on sampling fields, respectively .…”

An update on the occurrence of resistance-breaking populations of root-knot nematodes (Meloidogyne spp.) on resistant tomato in Greece with six new records from Crete

“…javanica), four from Epirus (M. javanica) and one from Macedonia (M. incognita), collected from nematode susceptible crops with no recent history of resistant tomato cultivation in the fi eld sites, reproduced at high rates on resistant tomatoes in pot tests (Tzortzakakis et al, 1999(Tzortzakakis et al, , 2005(Tzortzakakis et al, , 2014. Two populations, one from Thrace ( 4.…”

“…Since 1994, there have been 13 records of resistance-breaking populations of RKN from Greece (Tzortzakakis and Gowen, 1996;Tzortzakakis et al, 1999;Tzortzakakis et al, 2005;Tzortzakakis and Blok, 2007;Tzortzakakis et al, 2008;Tzortzakakis et al, 2014).…”

Occurrence of Meloidogyne incognita Infecting Resistant Cultivars and Development of an Efficient Screening Method for Resistant Tomato to the Mi-virulent -virulent Nematode

“…그러나 최근에 Mi 저항성 토마토를 침해하는 Meloidogyne spp.의 자연 발생 (Bost and Triantaphyllou, 1987;Kaloshian et al, 1996;Riggs and Winstead, 1959;Roberts et al, 1990;Tzortzakakis and Gowan, 1996) (Bridge and Page, 1980;Fassuliots, 1985;Taylor and Sasser, 1978 (Meng et al, 2004;Tesarova et al, 2003). 그 결과, Meng et al, 2004;Tesarova et al, 2003).…”

“…incognita)에 대한 저항성은 S. peruvianum로부터 도입된 Mi 유전자에 의한 것으로 알려져 있다 (Dropkin, 1969;Holtzmann, 1965;Philis andVakis, 1977, Noling, 2000). Crete와 미국 캘리포니아 등에서 보고되고 있다 (Berthou et al, 1989;Bost and Triantaphyllou, 1987;Kaloshian et al, 1996;Riggs and Winstead, 1959;Roberts et al, 1990;Tzortzakakis and Gowan, 1996). 토마토의 뿌리혹선충병 저항성 정도에 관한 국내 연구결 과로, 당근 뿌리혹선충(M. hapla)에 대하여 '강육토마토' 등 107개 품종이 감수성으로 조사되었고 (Cho et al, 1986) (Tables 1 and 2).…”