Cucurbit Genetics Cooperative Report 3:30 (article 16) 1980
Resistance to Cucumber Mosaic Virus Transmission by Aphis
Gossypii in Melon
H. Lecoq and M. Pitrat
Station de Pathologie Vegetale, INRA, Domaine
Saint Maurice, 84140 Montfavet, France (first author); Station
d'Amelioration des Plantes Maraicheres, INRA, Domaine Saint
Maurice, 84140 Montfavet, France (second author)
Aphid borne cucumber mosaic virus (CMV) causes one of the
major disease affecting muskmelon crops in southeastern
France. Risser et al. (1) have started a breeding
program to introduce an oligogenic recessive resistance
to CMV "common" strains found in Cucumis melo
line PI 161375 ('Songwhan Charmi' = SC) into Charentais
type muskmelon. However, this resistance does not prevent
some CMV isolates (grouped in the "Song" pathotype)
to infect SC after mechanical inoculation. "Song"
pathotype represents 35% of over 1000 CMV isolates collected
in naturally infected weeds and vegetables (3). It was important
to look for any other form of resistance to CMV in C.
melo. We report here the discovery, also in SC, of a
resistance to CMV "Song" strains transmission
by Aphis gossypii, one of the major vectors of
this virus in our field conditions. The melon aphid, although
transmitting very efficiently CMV "Song" strains
to a susceptible muskmelon cultivar was found to be unable
to transmit this virus to SC, even in conditions where 100%
of the susceptible plants are infected (2).
This resistance is governed by a single dominant gene independent
of the oligogenic recessive resistance to CMV "common" strains and this gene control a form of resistance
of melon to A. gossypii by non-preference. This
resistance was also found in five other melon lines: three
from Japan ('Ginsen Makuwa', 'Kanro Makuwa' and 'Shiroubi
Okayama') and two from India (PI 164320 and PI 414723).
Resistance to CMV transmission is specific to A. gossypii;
indeed, Myzus persicae, another efficient CMV vector
in our field conditions, is able to transmit CMV "Song"
strains to SC, although it is with a lower efficiency than
to a susceptible variety.
Literature Cited
- Risser, G., M. Pitrat, J. C. Rode. 1977. Ann. Amelior.
Plantes 27:509-522.
- Lecoq, H., S. Cohen, M. Pitrat, G. Labonne. 1979.
Phytopathol. 69:1223-1225.
- Leroux, J. P., J. B. Quiot, H. Lecoq, M. Pitrat. 1979.
Ann. Phytopathol. 11:(in press).
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