Lehnert, Marcus , Kessler, Michael .
A review of the mycorrhizae in ferns and lycophytes: their potential significance in phylogenetic and ecological studies.
We gathered information about presence, type, and abundance of mycorrhizal fungi in the sporophytes of ferns and lycophytes. We have records for 1298 samples representing 1009 species and 36 of the 40 recognized fern and lycophyte families, which show an average presence of fungal infections of 62%. Only mycorrhizae involving arbuscular mycorrhizal fungi (AMF; 75% of infected samples) and dark-septate fungi incl. ascomycetes (25% of infected samples) are known from these taxa. AMF are dominant in terrestrial ferns and change in prevalence according to soil fertility.
The percentage of non-mycorrhizal and facultatively mycorrhizal ferns increase with advanced phylogenetic position. This general pattern is disturbed by young radiations in old phylogenetic lineages (e.g., Selaginellaceae, Hymenophyllaceae) and in mainly epiphytic groups (Polypodiaceae), which are either non-mycorrhizal or have changed to a more derived type of mycorrhiza (e.g., with ascomycetes). The information for some groups (e.g., lycophytes, Oleandraceae, Dennstaedtiaceae, Tectariacaeae) is still insufficient and calls for more intensive studies. Reports for gametophytes indicate a much clearer trend of successive independence of ferns and lycophytes from mycorrhizae with advancing evolution.
Other works in progress investigate the change of fungal infection rates of terrestrial ferns in relation to changing soil fertility and elevation.
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1 - Georg-August University, Albrecht-von-Haller Institute for Plant Scien, Systematic Botany, Untere Karspuele 2, Goettingen, 37073, Germany
2 - Georg-August University, Albrecht-von-Haller Institute for Plant Scien, Systematic Botany, Untere Karspuele 2, Goettingen, 37073, Germany
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 28th, 2008
Time: 8:30 AM