Observations on morphological and nutritional aspects of perithecial formation of Nectria haematococca and Hypomyces solani

Abstract

Morphological and nutritional aspects of perithecial formation of Nectria haematococca Berk. & Br. and Hypomyces solani Rke. & Berth, were compared on a variety of media. Maximum perithecial development was observed on "natural" media. In synthetic liquid media, monosaccharides were more suitable for perithecial formation than were other carbon compounds examined. Likewise, amino acids as the sole source of nitrogen were found to be superior to either ammonium or nitrate nitrogen for perithecial production. Further, it was observed that, although light may be stimulatory, it was not an absolute requirement for perithecial induction. Isolates of these species showed remarkable uniformity in the morphology of perithecia, asci, and ascospores. Similarly, the identical response to carbon and nitrogen nutritional requirements for perithecial development substantiates a single identity for the isolates studied.