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The development of stromata of Sclerotinia fructicola and related species

1968; Cambridge University Press; Volume: 51; Issue: 5 Linguagem: Inglês

10.1016/s0007-1536(68)80083-x

0007-1536

H. J. Willetts,

Yeasts and Rust Fungi Studies

The development and structure of the stromata of the brown rot fungi were studied using stone fruits, apples and pears. Well-developed stromata were produced inside all the fruits, except apples, inoculated with S. fructicola. The stromata were similar to those formed in agar cultures, except for the inclusion of host cells in the medulla. The inner rind usually developed later than the outer one. On apples and pears, S. laxa forma mali produced only small localized brown areas around the sites of infection. In the other fruits inoculated with the European brown rot species, mummification took place in the outer cells and an outer but no inner rind developed. A thick hyphal mat developed on the outside of pears, nectarines and apricots infected by S. fructicola and this was organized into a structure similar to the stroma that develops in fruits and in agar cultures. Surface mycelium developed on some of the fruits infected by the European brown rot species, but the mats were not as well developed as that produced by S. fructicola. Microconidia were observed on some fruit mummies of all brown rot fungi. They were produced in largest numbers in the cavities between the outer surface of infected fruits and the inner surface of hyphal mats. Some were observed in depressions on the surface of plums and apricots infected with S. laxa and clusters also developed within the loosely interwoven hyphal mat formed on cherries by S. fructigena.