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The condition of the phloem in declining oaks
Author(s) -
Schlag M. G.
Publication year - 1995
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1995.tb00322.x
Subject(s) - phloem , phytoplasma , biology , botany , sieve tube element , quercus robur , quercus petraea , fagaceae , evergreen , genetics , polymerase chain reaction , restriction fragment length polymorphism , gene
Summary Oaks ( Quercus petraea, Q. robur ) from several sites in eastern Austria affected by novel oak decline (NOD), as well as oaks ( Q. robur ) showing symptoms of oak yellows (OY), were tested for the presence of mycoplasma‐like organisms (MLOs). The samples, comprising roots, annual shoots, and branches, were examined using light‐, fluorescence‐, and electron‐nucroscopic techniques. Staining with the DNA‐fluorochrome DAPI provided no evidence for the presence of MLOs in any of the samples. Furthermore, no pathological sieve‐tube necrosis and no abnormal callose accumulation could be observed. An association of MLOs with‘novel oak decline’ or ‘oak yellows’ is, therefore, unlikely.