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GENETICS OF PHYTOPATHOGENIC FUNGI. XI. A GENETIC STUDY OF AVIRULENCE DUE TO AUXOTROPHY IN PENICILLIUM EXPANSUM BY MEANS OF THE PARASEXUAL CYCLE
Author(s) -
Beraha L.,
Garber E. D.
Publication year - 1965
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1965.tb06765.x
Subject(s) - biology , auxotrophy , virulence , mutant , ploidy , methionine , genetics , penicillium expansum , botany , amino acid , gene , postharvest
Nine color and 35 auxotrophic mutants were tested for their virulence, using the ‘Jonathan’ variety of apple; only mutants requiring methionine were avirulent. One tested arginine‐requiring and the methionine‐requiring mutants were avirulent for the ‘Red Delicious’ variety. In vitro and in vivo, supplementation studies indicated that the avirulence was probably related to the relatively low concentration of the required amino acids at the site of inoculation. One heterocaryon and the corresponding diploid, involving 2 avirulent methionine‐requiring mutants, were virulent. Six mutant loci in 3 diploid strains could be assigned to 2 linkage groups by means of the parasexual cycle.