Resistance to A. solani in some tomato species has been reported (Andrus et al., 1942, Locke, 1949, Doolittle, 1954, Hodosy, 1976, Gardner, 1983). In order to enlarge the scope of genetic sources of A. solani resistance we tested 35 representatives of Lycopersicon, using the inoculation methods of Andrus (1941) and Dhiman et al. (1980). The inoculum consisted of 12 different isolates of the fungus. (Some of the results are shown in Table 1.)
Moderate resistance as far as leaf ILI symptoms are concerned was found in one local representative of L. esculentum (86E2208), one primitive accession (83602029), and L. pimpinellifolium 88610001. High level of stem resistance was observed in L. esculentum(86E2208 and 83602029), L. minutum 87610006 (not reported as a source till now), and many L. pimpinellifolium numbers, two of which (886100007 and 88610008) without symptoms, Moderate resistance was detected in L. glandulosum 87610009, L. cheesmanii 87610008, and L. peruvianum 87610010.
Although Gardner (1983) had reported resistance in both L. hirsutum representatives the accessions we tested performed as highly susceptible. This may be also connected with the virulence diversity of A. solani population.
Table 1. Reaction of Lycopersicon species to A. solani.
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Species PIGR's* Degree of
Numbers Damage
L S
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L. esc. 83602030 2,22 3,05
83602043 2,31 1,57
83602034 2,05 1,15
83602029 1,95 0,96
83E2208 1,91 0,55
87610007 2,37 3,38
L. pimp. 88610001 1,91 0,58
88610005 2,83 0,50
88610006 2,03 1,00
88610008 2,32 0,00
88610007 2,02 0,00
L. racem 87610005 2,19 1,46
L. humbol. 87620003 2,06 1,95
L. cheesm. 87610008 2,01 1,24
L. minut. 87610006 2,01 0,55
L. hirsut. 87610012 2,10 2,40
L. hir.gla. 87610013 2,09 3,30
L. peruv. 87610010 2,17 1,29
L. gland. 87610009 2,14 1,14
L. chilen. 87610011 3,59 3,29
S. pennel. 87610014 3,77 2,78
S. control 84602046 3,20 3,50
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*Institute of Plant Introduction and Genetic Resources
Literature cited:Andrus, C. et al. 1942. U. S. Dept. Agr. Circ. 652:23 pp.
Gardner, R. G. 1983. Proc. Pom. Tom. Worksh., March 7 -10, Miami, Florida.