RESEARCH REPORTS TGC REPORT 52, 2002
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Table 1
Disease severity, marks
Tomato sample
Foliage
Stems
Fruits
Resistant control
2
1
2
Susceptible control 4
4
4
LLB 98/00-1
1
1
1
LLB98/00-2
2
1
1
LLB 98/00-3
1
0
1
LLB 98/00-4
2
1
1
LLB 98/00-5
1
0
1
LLB 98/00-6
1
0
0
LLB 98/00-7
1
1
2
LLB 98/00-8
2
1
1
LLB 98/00-9
2
1
1
LLB 98/00-10
1
1
1
LLB 98/00-11
2
1
1
LLB 98/00-12
1
0
1
LLB 98/00-13
1
1
2
LLB 98/00-14
2
1
1
LLB 98/00-15
1
0
1
LLB 98/00-16
2
1
1
LLB 98/00-17
1
1
1
LLB 98/00-18
1
1
1
Our data indicate that the most prospective tomato breeding material is based on
a combination of different resistant sources. For example, lines combining
features of interspecies hybrids L. esculentum x L. humboldtii, L. esculentum x L.
pimpinellifolium, L. humboldtii x L.esculentum var. cerasiforme, L. peruvianum x
L. hirsutum var. glabratum, L. hirsutum var. glabratum x L. esculentum var.
cerasiforme, and L. cheesmanii x L. humboldtii.
Collected Phytophthora strains appeared to be susceptible to both metalaxyl in
concentration 10 and 100 mg/ml and dimethomorph in concentration 3 mg/ml.
Tomato strains were distinct from those isolated from the potato crops in the
same region. Highly resistant metalaxyl strains predominated in those
populations. Tested tomato strains differed in molecular markers and
aggressiveness. Both A1 and A2 strains were found. Data on population structure
confirm high polymorphism of Phytophthora in the new sexual population.
The most aggressive strains will be used in laboratory bio-assays for further
screening selected tomato genotypes for the late blight resistance.
References:
Bagirova S.F., Dyakov Yu.T. 1998.Ob uchastii oospor v vesenem vozobnovlenii
Infekcii fitoftoroza tomata (The role of oospores in overwintering of
Phytophthora infestans on tomato crops).Selskoxozyistvennaya biologiya. 3:
69-72.
16
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