Volume 10 Part 2 Article 34: New Ways of Breeding and Strain Protection for Practical Mushroom Cultivation

Volume 10 Part 2 Article 34
Year 1979
Title: New Ways of Breeding and Strain Protection for Practical Mushroom Cultivation
Author: G. Eger

Abstract:

In Mushroom Science IX the discovery of a sporeless strain, “42 x 11”, in Pleurotus ostreatus has already been reported (Eger, 1974). This strain grows fast, forms fruit bodies of radial symmetry and has a relatively high requirement of light. Its fruit body yield is not as high as in good commercial strains. As has also been outlined previously, sporeless strains in P. ostreatus and other commercially cultivated mushrooms are highly desirable. There is no question that “42 x 11” is very valuable, although it still needs improvement through breeding.

The normal way of breeding, namely, selection of single spore isolates and pairing them with new partners, cannot be employed because of the sporelessness. One solution was tried by pairings with compatible monokaryons, the socalled “di-mon-matings”. This mainly led to new sporeless dikaryons when both partners were related with each other, e.g. from the same original stock, and are most problematical (Eger et al., 1976). Theoretically, instead of trying strain improvement, better sporeless strains which must exist in nature, though very rare,could be searched. It could also be likewise tried to make sporeless strains from normal ones by treatment with mutagens. This was succeeded in Coprinus macrorhizus (Takemaru and Kamada, 1971). The latter way is indeed possible, but the resulted strains will contain besides the desired sporeless character also other mutations that make them more or less useless for oractical cultivation (Eger, unpublished).

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