Record ID No. |
73 |
Author(s) |
Setaro S., Kottke I., Oberwinkler F. , 2006 |
Affiliation |
University of Tubingen, Morgenstelle 1, D-72076 Tubingen, Germany, Email: sabrina.setaro@uni-tuebingen.de |
Title |
Anatomy and ultrastructure of mycorrhizal associations of neotropical Ericaceae |
Source. Vol.(no):Page |
Mycological progress. 5(4): 243-254p. |
Categories |
Ericoid Mycorrhiza |
Subjects |
Anatomy,Histology Morphology |
Host |
Cavendishia nolilis, , Ericoideae, Vaccinioideae |
Organism |
Ericoid mycorrhiza, Arbutoid mycorrhiza, Sebacinales, Ascomycetes; Monotropodi mycorrhiza |
Country |
Germany, Europe |
Abstracts |
Ericaceae are obligatory associated with symbiotic fungi forming several, distinctive categories of mycorrhizas.
While ericoid, arbutoid, and monotropoid mycorrhizas are known
since many years from ericads of the northern hemisphere and the ericoid mycorrhiza also from Australia, a further mycorrhizal category with hyphal sheath, Hartig net, and intracellular colonization was described by us recently and termed cavendishioid mycorrhiza because it was found on Cavendishia nobilis, a species belonging to the Andean clade (Vaccinioideae)
of Ericaceae. As the previous findings indicated a correlation
between the mycorrhizal category and the systematic position of Ericaceae, we tested the hypothesis that other ericads of the Andean clade might also form cavendishioid mycorrhizas, while
ericads occurring in the same area but not belonging to the Andean clade might not. Mycorrhizas of 20 different ericaceous species, 15 belonging to the Andean clade and 5 to other
Vaccinioideae or Ericoideae, were sampled in the tropical mountain rain forest area of South Ecuador and investigated by light and electron microscopy. All the 15 members of the Andean clade ericads displayed a hyphal sheath, as well as inter- and
intracellular colonization by hyphae as was found on Cavendishia previously. The five species not belonging to the Andean clade ericads displayed only intracellular colonization by hyphae and hence were typical ericoid mycorrhizal. Ultrastructural studies revealed Sebacinales and ascomycetes as mycorrhiza formers in both associations even within one single cell. The results thus support the hypothesis that the Andean clade of Ericaceae forms mycorrhizas distinct from the arbutoid category and most likely presents an independent evolutionary line in the Ericaceae
derived from the ericoid mycorrhizas, justifying the new term "cavendishioid mycorrhiza"
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