A STUDY ON NUCLEI OF FOUR FORMAE SPECIALES OF FUSARIUM OXYSPORUM
尖孢镰刀菌四个专化型细胞核的初步研究

Spore germination, time of nuclear division, and nuclear DNA contents were compared for four Fusarium oxysporum formae speciales. No much difference was found in the rate of spore germination among the four formae speciales, however, the time of first nuclear division during spore germination was different. They were 5.67hrs, 5.45hrs, 7.35hrs, and 7.82hrs for the cucumber, water-melon, water-chestnut and soybean formae speciales, respectively. Their average nuclear DNA contents were 0.321pg, 0.306pg, 0.177pg, and 0.174pg, respectively, the first two being doubled as compared with other two. It appears that Fusarium oxysporum f. sp. cucumerinum and F. oxysporum niveum may be very closely related and the other two formae speciales as well.