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A microscopic study of the different classes of symptoms coded by the Vf gene in apple for resistance to scab (Venturia inaequalis)
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The different symptoms of resistance coded by the VF gene were studied on glasshouse‐grown apple seedlings after inoculation with a conidial suspension of Venturia inaequalis. Scanning‐electron microscopy and histological observations defined precisely three different classes of symptoms. Class 1 corresponds to a hypersensitive reaction. Class 2 is characterized by considerable tissue modifications but no sporulation whatsoever occurs; this reaction defines resistant hybrids. In class 3 the fungus remains active and can sometimes sporulate abundantly; this class was divided into two subgroups, one comprising all the hybrids of weak resistance, the other the hybrids of weak susceptibility.
Title: A microscopic study of the different classes of symptoms coded by the Vf gene in apple for resistance to scab (Venturia inaequalis)
Description:
The different symptoms of resistance coded by the VF gene were studied on glasshouse‐grown apple seedlings after inoculation with a conidial suspension of Venturia inaequalis.
Scanning‐electron microscopy and histological observations defined precisely three different classes of symptoms.
Class 1 corresponds to a hypersensitive reaction.
Class 2 is characterized by considerable tissue modifications but no sporulation whatsoever occurs; this reaction defines resistant hybrids.
In class 3 the fungus remains active and can sometimes sporulate abundantly; this class was divided into two subgroups, one comprising all the hybrids of weak resistance, the other the hybrids of weak susceptibility.
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