| phylogenetic studies of ophioglossaceae: evidence from rbcl and trnl-f plastid dna sequences and morphology. | ophioglossaceae are a putatively ancient lineage of ferns in which the aerial portion of the plant is composed of a single leaf. the simplicity of foliar morphology has limited the number of characters available for constructing classifications and contributed to taxonomic difficulties at nearly every level of classification within the family. analysis of plastid dna rbcl sequences from 36 species representing the diversity of ophioglossaceae supported the monophyly of the family. intrafamilial ... | 2003 | 12801476 |
| gene transfer from a parasitic flowering plant to a fern. | the rattlesnake fern (botrychium virginianum (l.) sw.) is obligately mycotrophic and widely distributed across the northern hemisphere. three mitochondrial gene regions place this species with other ferns in ophioglossaceae, while two regions place it as a member of the largely parasitic angiosperm order santalales (sandalwoods and mistletoes). these discordant phylogenetic placements suggest that part of the genome in b. virginianum was acquired by horizontal gene transfer (hgt), perhaps from r ... | 2005 | 16191635 |
| molecular study of arbuscular mycorrhizal fungi colonizing the sporophyte of the eusporangiate rattlesnake fern (botrychium virginianum, ophioglossaceae). | the arbuscular mycorrhizal (am) fungi colonizing the sporophytes of the eusporangiate rattlesnake fern (botrychium virginianum, ophioglossaceae) in its hungarian population were investigated in the present study. different regions of the nrrna gene complex were analyzed using two different primer sets. these produced similar results for the detected am fungi phylotypes. several am fungal lineages were associated with sporophytes of b. virginianum. phylogenetic analyses of different partial small ... | 2007 | 17566790 |
| fern-associated arbuscular mycorrhizal fungi are represented by multiple glomus spp.: do environmental factors influence partner identity? | symbioses involving arbuscular mycorrhizal fungi (amf) are among the most important ecological associations for many plant species. the diversity of amf associated with ferns, however, remains poorly studied. using recently designed glomus-specific primers, we surveyed the amf community associated with ferns from deciduous, broad-leaved second-growth forest habitats at the eastern edge of the piedmont region of central virginia, usa. results indicate that this molecular approach may be a useful ... | 2009 | 19242733 |