A comparative morphological and physiological study of a number of strains of Botrytis cinerea Pers. with special reference to their virulence

摘要: Summary (1) The growth features of three strains Botrytis cinerea were examined on a variety media. One strain (Sc) proved to have strongly marked sclerotium-forming tendency, M showed general tendency towards the development aerial mycelium, and Sp was characterised by its freely sporing habit. (2) intensity with which various characters manifested varied somewhat from medium medium, but tendencies as noted above observable throughout. (3) effect high atmospheric humidity increase sclerotium formation diminish sporulation. A similar produced absence light indicated. (4) definite difference in spore size shape shown between one hand Sc other. (5) On majority media tested, differed other two showing much slower rate growth. (6) Inoculation experiments number host plants that most actively parasitic. No evidence selective parasitism obtained. (7) An analysis factors responsible for differences virulence observed attempted. As far data could be interpreted, it varying degree not ascribed capacities secreting pectinase enzyme. It also appeared parasitic power explained basis different powers mechanical penetration. test latter respect they all possessed approximately same penetrative judged their behaviour series formalised gelatine membranes graded hardness.