Kan suksa rok phut namman lae kan porihan rok phut namman.
1985
Thammasak Sommartya
Two populations of Cercosporidium personatum (Berk. and Curt.) Deighton, were collected from distinctive geographical areas, i.e. USA and Thailand. There were 4 US isolates and 6 Thai isolates, these isolates were cultured on stock plants, (NC 3033) at green house of NCSU, Raleigh, N.C. Comparative studies on adaptation to temperature while germinating and morphological character were conducted. Experimental results revealed that Thai poplation showed well adaptation over the US isolates, in all temperature (16,20,24,28,30,32,34 and 36 deg.celsius). Nevertheless, both populations possessed an optimum at 16 to 30 deg.celsius at all incubation time (12, 24 and 48 hr). It is, undoubtedly, found-that both US and Thai C. personatum conidial length was micro measured, 20 to 90 and 16 to 86 micro respectively. Interestingly, these findings have dismissed the previous records from various decumented papers. Besides, number of septum, also morethan normally reported was that 8 septa, but this investigation found both Thai and US have 1 to 11 septa. Abnormal shape conidia, i.e. fork-like conidia was observed from C. personatum of both places. These fork-like conidia seemed to produce normal germtubes either intercallary or-terminally, with spectacularly, sometimes 4 germtubes protruded from all the three terminal ends of conidia. These findings enable us to believe that C. personatum which caused late or black leaf spot of peanut (Arachis spp.) world wide,might be certainly different in some particular characters, i.e. morphology and germination adaptability in various temperature.
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