Sp. Tian et P. Bertolini, CHANGES IN CONIDIAL MORPHOLOGY AND GERMINABILITY OF BOTRYTIS-ALLII AND PENICILLIUM-HIRSUTUM IN RESPONSE TO LOW-TEMPERATURE INCUBATION, Mycological research, 100, 1996, pp. 591-596
Botrytis allii and Penicillium hirsutum spores, produced at 20, 10, 4,
0 and -2 degrees C on potato dextrose agar, showed a clearly inverse
relationship between spore volume and incubation temperature. The spor
e volumes of both B. allii and P.hirsutum were greatest at -2 degrees
and smallest at 20 degrees. The mean volume of B. allii conidia produc
ed at -2 degrees was 2 . 8 times larger than that of conidia produced
at 20 degrees, whereas the volume of P. hirsutum doubled. When the spo
res produced at different temperatures were incubated at 20, 10, 4, 0,
-2 and -4 degrees, the large conidia from the lower temperature condi
tions germinated much earlier and had a faster germ-tube growth than t
he small ones, particularly when the temperature for spore germination
was below 0 degrees.