THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
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<strong>PYTHIUM</strong> APHANIDERMATUM(Edson) Fitzp, Mycologia 15:168 Figs 20-<br />
23<br />
COLONY MORPHOLOGY: Colonies on CMA forming a diffuse growth<br />
pattern with cotony aerial mycelium. MYCELIUM: Main hyphae up to II urn<br />
wide. SPORANGIA:Mosdy terminal consisting of complexes of swollen<br />
torulated hyphai bodies. Zoospores formed at room temperature. OOGONIA:Tertnlnai,<br />
globose, smooth 18-29 (av. 22.7 ± 0.1-95% C.I),um diam. AN<strong>THE</strong>RIDIA:Mostiy<br />
intercalary, occasionaly monoclinous or diclinous, 1(-2)/ oogonium. OOSPORES:<br />
aplerotic) 15-25 (av. 19.2 ± 0.6-95% C.I) urn diam. wall 1-2 (av. 1.2 ± 0.3-95%<br />
c.I.)pm thick. Ooplast 5-12 (av. 9.3) urn ciam. TEMPERATURE-GROWTH<br />
RELATIONSHIPS: Minimum 10 0C, optimum 35-40 0C, maximum 40 0 C Daily<br />
growth rate on CMAat 25 0 C 28mm.<br />
MATERIAL EXAMINED: ex Solanum melongona L., Ram Alla' (FCCAU<br />
102.27); ex Cucurbita sp, Nablus (FCCAU 102.26); ex Citrus sp, Gaza (FCCAU<br />
102.25) ex soil Jordan Valley (FCCAU 102.10), and several other isolates.<br />
OCCURRENCE: Frequently isolated from diseased roots and damped-off<br />
seedlings, and often present (in 45% of the fields) in irrigated soils; it was not<br />
found in nonirrigated fields. This species was also recorded from Cucurbitaceae<br />
and tomato in Palestine (Reichert, 1939), and thought to be 'common in soils in<br />
Israei' (Solei & Pinkas, 1984).<br />
22
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