THE GENUS PYTHIUM - An-Najah National University

More documents

Recommendations

Info

IV. DESCRIPTIONS OF SPECIES Whenever possible two to three isolates of each Pythium species have been deposited in the Fungus Culture Collection of An-Najah University (F C C A U). The following scale is used to describe the degree of presence of Pythium species in soil: constantly present, found in 80-100% of soils; mostly present, found in 60-80% of soils; often present, found in 40-60% of soils; seldom present, found in 20-40% of soils; and rare, found in 1-20% of soils. PYTHIUM ACANTHICUM Drechsler, J. Wash. Acad. Sci. 20:408 (1930) Figs 2-7 COLONY MORPHOLOGY: Colonies on CMA showing a distinct rosette pattern; no aerial mycelium. MYCELIUM: Main hyphae 2.5-5 (av.3.2).um wide. SPORANGIA: often intercalary, occasionally terminal; subglobose 15-28 (av. 20.6± 2.1-95% C. Ij um diam, often forming complexes of irregular subglobose elements attached together by filamentous portions. Zoospores produced in water culture at room temperature. OOGONIA:Mostly terminal,occasionally intercalary, globose 14.0-24.0 (av. 20.6 ± 0.6-95% C.I) .urn in diam; wall echinulate, spines conical with blunt tips, 1-6 (av. 3.5).um long. ANTHERIDIA: 1(-2)joogonium, mostly monoclinous arising at distance upt to 25)lm below oogonium base, rarely diclinous, often possessing branched vegetative prolongations; antheridial cells often inflated with few constrictions applied to the oogonium with narrow or broad contact interph ase. OOSPORES: plerotic, 17-21 (av.19.4 ± 0.5-95% C.I).um diam, wall 1.5 ± 0.12 95% C.I.um thick, coplast 9-13 (av. 10) .urn diam. TEMPERATURE-GROWTH RELATIONSHIPS: Minimum 10 0 C ,optimum25-30 0 C, maximum 37 0 C, Daily growth rate on CMA at 25 0 C 9mm. MATERIAL EXAMINED: ex soil, Tulkarm (FCCAU IOU); ex soil, Gaza (FCCAU 101.2) ex Malus sylvestris (L.) Mill, Nablus (FCCAU 101.6), and several other isolates. OCCURRENCE: Infrequently isolated from diseased roots, stream water, and stream bed. 16
Figs. 2-7 Pythium acanthicum. (2,3) habit showing hyphae and oogonia. (4.5) sporangia. (6,7) oogonia and antheridia (Bars= 10 urn). 17
Page 1 and 2: THE GENUS PYTHIUM In the West Bank
Page 3 and 4: PREFACE This monograph is aimed at
Page 5 and 6: SUMMARY A key to the 48 taxa of Pyt
Page 7 and 8: Pythium species such as P. periploc
Page 9 and 10: II. MATERIALS AND METHODS A. Isolat
Page 11 and 12: Microscopic examination: Microscopi
Page 13 and 14: Growth rate and temperature limits
Page 15 and 16: 9(4) 10(9) 11(10) 12(11) 13(12) 14(
Page 17 and 18: 29(28) 30(29) 31(30) 32(31) 33(28)
Page 19: 46(45) 47(1) 48(47) 49(48) 50(48) 5
Page 23 and 24: Figs. 8-11. Pythium anandrumn. Spor
Page 25 and 26: Figs. 16-19. Pythiurn anandrurn. Oo
Page 27 and 28: Figs. 20-23. Pythium aphanidermatum
Page 29 and 30: Figs. 24-29. (24-26) Pvthium c%rotu
Page 31 and 32: Figs. 30-35. (30-33) Pythium debary
Page 33 and 34: Figs. 36-41. Pythium dissimile. (36
Page 35 and 36: Figs. 42-47. Pythium dissotocum. (4
Page 37 and 38: Figs. 48-54. Pythium echinulatum. (
Page 39 and 40: Figs. 55-59. Pvthium graminicola. (
Page 41 and 42: MATERIAL EXAMINED: ex Vitia fabae,
Page 43 and 44: PYTHIUM LrTARIL:\l Ali - Shtaveh, B
Page 45 and 46: PYTHIUM MIDDLETON II Sparrow, Aquat
Page 47 and 48: PYTHIUM MONOSPERMUM Pringsh., Jb. w
Page 49 and 50: Figs. 85-90. (85) Pythium nagaii, o
Page 51 and 52: Figs. 91-94. Pythium oligandrum.(91
Page 53 and 54: Figs. 95-100. Pythium papillaturn.
Page 55 and 56: PYTHIUM PULCHRUM Minden, Mykol. Unt
Page 57 and 58: Figs. 101-108. (101-103) Pythium ro
Page 59 and 60: Figs. 109-114. Pythium salpingophor
Page 61 and 62: FIgs. 115-120. (115) Pythium sylvat
Page 63 and 64: Figs. 121-126. Pythium torulosum. (
Page 65 and 66: MATERIAL EXAMINED: ex Brassica oler
Page 67 and 68: Figs. 127-131. Pyihium vanterpoolii
Page 69 and 70: Figs. 132-136. Pythium vexans. (132
Page 71 and 72:
V.HOST LIST A list of the vascular
Page 73 and 74:
VI REFERENCES Agrios, G.N. 1978. Pl
Page 75 and 76:
Garrett, 195 I. Ecological groups o
Page 77 and 78:
Reichert, I. 1939. Palestine: Disea
Page 79 and 80:
VII. INDEX OF FUNGAL NAMES Fusarium
Page 81:
~I ~) ~IJ ~~I Pythium JI t'.~~~ 61:
show all

THE GENUS PYTHIUM - An-Najah National University

Create successful ePaper yourself

Delete template?

Save as template?