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Ontogenická rezistence k Venturia inaequalis (Cke.) Wint.
 Korbelová, Pavla
The Bachelor Work describes the disease of apple scab and characterises the originator of this disease - the fungus Venturia inaequalis. The possibilities of both direct and indirect protection are mentioned. The work concentrates on breeding for resistance, particularly with the use of the gene Vf (Rvi6), including the problems connected with breaking through the resistance by physiologic races of the pathogen. The emphasis is placed on ontogenic resistance, ie. the resistance influenced by age as the ability of all plants or their parts to resist and tolarate the disease in connection with the age and maturation of the host tissues. Young apple tree leaves can be susceptible to apple scab (Venturia inaequalis) but when full-grown they become more resistant to the infection. The practical use of ontogenic resistance lies in the potential for the breeding of resistant varieties, the introduction of which into cultivation will have a positive effect on agricultural yield and will also bring great benefits to agriculturists.
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