1981 Volume 47 Issue 4 Pages 464-471
Sclerotia of Rhizoctonia solani (Sasakii type) formed on rice plants were more resistant to high temperature and high humidity levels than those formed on potato-sucrose-agar (PSA). Sclerotia formed on rice plants has high proportions of “empty” cells in their outer layer, while the outer layer of sclerotia formed on PSA was narrower. The carbon dioxide content in gas from the tissues of sclerotia formed on rice plants was about 3 times than in ambient air. When sclerotia formed on PSA were stored at 25C under 70 and 80% relative humidity at various concentrations of carbon dioxide, viability of sclerotia held in air containing 0.1 and 0.15% carbon dioxide remained at the highest level similar to that of sclerotia formed on rice plants. The role of the structure in the viability of sclerotia is discussed.