Blind Seed Disease
Detailed infection studies were conducted by Wilson et al. (1945) and Neill and Hyde (1939). Infections occurred at the base of the stigma
in ovaries within 1 week of fertilization (Wilson et
al. 1945). Hyphae invaded the inner epidermis, nucellus, and embryo sac.
Within 9 days, conidia were produced between inner epidermis and outer
integument and appeared on the surface. The endosperm and embryo filled with
hyphae. The resulting grains were as long as healthy seeds but thinner. Hyphae
invaded the embryo and endosperm when infections occurred after the embryo was
differentiated into scutellum, plumule, radicle, and endosperm.
Neill and Hyde (1939) observed greater
ramification and degradation of endosperm and embryonic tissues than Wilson et
al. (1945), who observed extensive invasion of both
embryonic and endosperm tissues. Wilson et al. (1945) observed hyphal penetration through the
epithelial and aleurone layers, while Neill and Hyde (1939) reported that G. temulenta did not
appear to penetrate cells of the aleurone layer. Systemic infections beyond the
seed were not observed (Cunningham 1940, 1941;
Neill and Hyde 1942; Wilson
et al. 1945).
United States Department of
Agricultural Research Service
The material on this page is in the public domain.
Original posting: October 2001.