Histopathology of the Brown Spot Fungus on Longleaf Pine Needles

Jewell, F. F.

doi:10.1094/phyto-73-854

Cited by 10 publications

(27 citation statements)

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“…Microscopically, Pinus taeda needle tissue affected by P. lethale exhibited anatomical abnormalities similar to reports for other Southern pine needle-cast pathogens (JEWELL 1983(JEWELL , 1990a(JEWELL , b, 1994. The collapse of mesophyll cells resulting in the typical`lattice-like' appearance of these cells was again the prominent anatomical abnormality exhibited in P. lethale-affected needle tissue.…”

Section: Discussionsupporting

confidence: 76%

“…Overall, although scarce for the most part, hyphae of P. lethale were observed in more of the tissue types in dead needle portions than previously reported for other needle-cast pathogens (JEWELL 1983(JEWELL , 1993a(JEWELL , 1994(JEWELL , 1998. Commonly, hyphae were observed in the endodermis, resin ducts, transfusion tissue, and vascular tissue.…”

Section: Discussionmentioning

confidence: 67%

“…The collapse of mesophyll cells resulting in the typical`lattice-like' appearance of these cells was again the prominent anatomical abnormality exhibited in P. lethale-affected needle tissue. This is additional con®rmation that the collapse and resulting con®guration of affected mesophyll appears to be a consistent feature associated with Southern needle-cast pathogens (JEWELL 1983(JEWELL , 1990a(JEWELL , b, 1993a(JEWELL , 1994. Although there was considerable mesophyll cell collapse in affected needles, P. lethale hyphae were usually not abundant.…”

Section: Discussionmentioning

confidence: 78%

“…Although there was considerable mesophyll cell collapse in affected needles, P. lethale hyphae were usually not abundant. Such lack of hyphae in the presence of extensive cell abnormalities has previously been observed, and the possible role of an unspeci®ed toxin associated with these fungi has been proposed as a contributing factor in the collapse of the affected mesophyll cells (JEWELL 1983(JEWELL , 1990a(JEWELL , 1993a(JEWELL , 1998. The present work tends to support the theory that a toxin is involved with the pathogenesis of Southern pine needle-cast pathogens.…”

Section: Discussionmentioning

confidence: 89%

“…2A,B). Cell abnormalities usually associated with the presence of needle-cast pathogen hyphae were not observed in the colonized noncollapsed mesophyll cells (HARTIG 1874;JEWELL 1983JEWELL , 1990aJEWELL , b, 1993aJEWELL , 1994JEWELL , 1998.…”

Section: Symptomatic Needlesmentioning

confidence: 99%

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Histopathology of Pinus taeda needles infected by Ploioderma lethale

Jewell

2001

Forest Pathology

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The histopathology of the host/parasite relationship of Pinus taeda needles infected by the Ascomycete Ploioderma lethale and the morphology of the fructifications of the pathogen were investigated. Amphigenous elliptical teleo‐ and anamorph stromata developed only on dead portions of affected needles. Insertion of the teleo‐ and anamorph stromata in the host needle tissue was subepidermal, and the stromata were covered by a shiny to dull black clypeus. Teleomorph stromata frequently coalesced. Abnormal host tissue was primarily confined to tissues external to the endodermis in the symptomatic portion of affected needles, where a collapse of the mesophyll cells was exhibited. An obvious narrowing of affected needles was observed at the distinct juncture of dead and green tissue. Inter‐ and intracellular hyphae colonized the collapsed mesophyll cell regions, endodermal, transfusion, vascular tissues, and resin ducts. Intercellular hyphae and an interface were present in the living mesophyll cells of the green needle tissue subtending the dead terminal portion of affected needles.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 67%