[Phytoalexin activity in apples as an indication of their resistance to phytopathogenic microorganisms].

Phytoalexin activity of various apple varieties was measured during their storage at subcryoscopic (-2.3 degrees C) and supracryoscopic (-1.3 degrees C) temperatures. More resistant late winter apple varieties Renet Simitrenko and Renet Champagne showed higher phyto-alexin activity than the autumn-winter strain Calville Snowy. By the end of storage the phytoalexin activity decreased independently on the storage conditions. However, the apples that were kepat at supracryoscopic temperature retained a hight phytoalexin activity. The apples which were kept at -2.3 degrees C showed no phytoalexin activity.