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> VEXANS de Bary, J. BOI. Paris 14:105-106 (1896). Figs 132-136<br />
COLONY MORPHOLOGY: Colonies on CMA showing an indistinct<br />
chrysanthemum pattern with some aerial mycelium. MYCELIUM: Main hyphae<br />
2.5-4 (av. 3)..um wide. SPORANGIA: Intercelary or terminal, subglobose to<br />
avoid, 15-19 (av. 16.0± 0.7-95% c.I.) urn diam, produced in water culture after<br />
10 days, xoospores produced at 5-15 0C. OOGONIA: Terminal or intercalary,<br />
subglobose, 15-26 (av. 21.6± 0.8-95% c.!.) .nm diam. AN<strong>THE</strong>RIDIA: 1(-<br />
2)/ oogonium, mostly monoclinous arising at some distance from oogonium<br />
base, rarely diclinous; antheridial cells typically bell-shaped. OOSPORES:<br />
Aplerotic, 15-21 (av. 18.8± 0.7-95% C.I.)J.lm diam, wall 1-2 (av. 1.6± 0.1 -95%<br />
c.1.) .um, ooplast 7-13 (av. 9.9± 0.5 -95% c.1.) urn diam. TEMPERATURE-<br />
GROWTH RELATIONSHIPS: Minimum 5 0C, Optimum 25 0C, maximu 35°C.<br />
Daily growth rate on CMA at 25 0C 10.8 mm.<br />
MATERIAL EXAMINED: ex Allium cepa L., Ram Alla' (FCCAU 126.9)m<br />
ex Sesbania aegyptiaca, Nablus (FCCA U 126.10); ex soil, Tulkarem (FCCA U<br />
126.1), and several other isolates.<br />
OCCURRENCE: Infrequently isolated from diseased roots, and also seldom<br />
present in soil (found in 36% of the soils sampled). Other records in the region<br />
come from soil in the Lebanon (Ahrens, 1971) and from soil in Iraq (Al-Doory<br />
et al. 1959).
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