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Allelism of Cf-19, of Cf-23, and of the Cladosporium resistance gene of the line Bulgaria N°1.
Laterrot, H., and Morettl, A.
Station d'Amelioration des Plantes Maraicheres, BP 94 - F84143 Montfavet Cedex. France.
A series of tomato lines are studied in relation to Cladosporium fulvum (= Fulvia fulva) isolates from France
and other countries of the Old World. Among these we have observed several groups of lines having the same type
of reaction in front of the large number of studied isolates.
Until now we have demonstrated allelism or independence of various sources of partial resistance (to see
TGC Report 41 and 43). Now we have to present the results of three allelism tests between the three following
lines controlling a absolute and dominant Cladosporium resistance. This resistance is sometimes accompanied by
some little necrotic spots.
- Ontario 7519 (Cf-19), received from E.A. Kerr (1980)
- Ontario 7523 (Cf-23), received from E.A. Kerr (1980)
- Bulgaria N°1, received from I.W. Boukema (1980).
For the three independent tests three plants of each line served as the basis of the crosses. Here we
present the total of plants for every group. The tests were carried out using a French Cladosporium isolate
belonging to pathotype 0.
The results (Table 1) show that not one susceptible plant was found among the tested populations. Thus
the allelism of Cf-19, Cf-23 and the allele controlling the resistance of Bulgaria N°1 can be concluded.
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