THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
THE GENUS PYTHIUM - An-Najah National University
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>PYTHIUM</strong> GRAMINICOLA Subramaniam, Bull. Agric. Res. Pusa<br />
177:5(1928) (as 'graminicolum'i. Figs 55-59<br />
COLONY MORPHOLOGY:Colonies on CMA forming a radiate pattern<br />
with scanty aerial mycelium. MYCELIUM:Main hyphae 2.5-4(av. 3.4»)Jm wide.<br />
Appressoria subglobose or irregular. SPORANGIA: Terminal or intercalary,<br />
consisting of inflated lobulated irregular complexes of hyphal bodies. Zoospores<br />
formed at 5-20 0C. OOGONIA:Terminal or intercalary, smooth, globose, 20-33<br />
(av. 26.1± 1.3-95% c.I.»).lm diam. AN<strong>THE</strong>RIDIA: 1-3/ oogonium, mostly<br />
monoclinous, occasiounally diclinous; antheridial stalk sometimes branching<br />
into two branches each bearing an antheridial cell, occasionally entwining the<br />
oogonial stalk. OOSPORES:Plerotic, occasionally 2-3 oospores/ oogonium; wall<br />
1-3(av. 2.5± 0.1-95% C.I) .um thick. Ooplast 10-18 (av. 13.4)..um diam.<br />
TEMPERATURE-GROWTH RELATIONSHIPS:Minimum So C, optimum<br />
2SoC, maximum 300e. Daily growth rate on CMA at 2SoC 7mm.<br />
MATERIAL EXAMINED: ex soil, Nassareyeh (FCCAU 141.1; FCCAU<br />
141.2; FCCAU 141.3).<br />
OCCURRENCE: Isolated only once from an irrigated field under vegetables<br />
after wheat.<br />
<strong>PYTHIUM</strong> HYPOGYNUM Middleton, Mem. Torrey bot. Club 20:69(1943).<br />
OCCURRENCE: Rarely isolated from irrigated fields (found in 14% of the<br />
soils): it was absent in nonirrigated fields.<br />
34
Change language