Behavior of colorless appressoria in an albino mutant of Colletotrichum lagenarium

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Abstract
Spores of an albino mutant of Colletotrichum lagenarium formed colorless appressoria. The appressoria germinated laterally and formed secondary appressoria after further incubation. Appressorial formation was accompanied by nuclear division and migration of the spore contents into the primary appressorium. When the primary appressorium was mature, the nucleus in the spore had disappeared and the spore appeared empty. Similar phenomena were observed in the formation of secondary appressoria from primary appressoria. Formation of both primary and secondary appressoria was temperature sensitive. When spores were incubated in the presence of cycloheximide after 1 h of incubation, formation of primary and secondary appressoria was not affected. Secondary appressoria pigmented by addition of 3,4-dihydroxyphenylalanine could penetrate nitrocellulose membranes.