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Pollen Wall Ultrastructure Of Araceae And Lemnaceae In Relation To Molecular Classifications, Michael Hesse
Pollen Wall Ultrastructure Of Araceae And Lemnaceae In Relation To Molecular Classifications, Michael Hesse
Aliso: A Journal of Systematic and Floristic Botany
A comparative ultrastructural study of Araceae pollen walls was conducted for the first time. The results are based mainly on investigations by transmission electron microscopy of 101 species in 70 genera (out of a total of 105 genera), while pollen of 83 genera with 219 species were studied by scanning electron microscopy, generally without acetolysis. Special attention was given to Lemnaceae (including Limnobiophyllum) considered to be closely related to Araceae (especially to Pistia). The ultrastructural pollen wall characters are mostly in accordance with and strongly support the morphological classifications and the arrangement of genera within recent molecular trees. …
Phylogeny Of Agavaceae Based On Ndhf, Rbcl, And Its Sequences, David J. Bogler, J. Chris Pires, Javier Francisco-Ortega
Phylogeny Of Agavaceae Based On Ndhf, Rbcl, And Its Sequences, David J. Bogler, J. Chris Pires, Javier Francisco-Ortega
Aliso: A Journal of Systematic and Floristic Botany
Great advances have been made in our understanding of the phylogeny and classification of Agavaceae in the last 20 years. In older systems Agavaceae were paraphyletic due to overemphasis of ovary position or habit. Discovery of a unique bimodal karyotype in Agave and Yucca eventually led to a reexamination of concepts and relationships in all the lilioid monocots, which continues to the present day. Developments in cytogenetics, microscopy, phylogenetic systematics, and most recently DNA technology have led to remarkable new insights. Large-scale rbcL sequence studies placed Agavaceae with the core Asparagales and identified closely related taxa. Analysis of cpDNA …
Phylogeny And New Intrageneric Classification Of Allium (Alliaceae) Based On Nuclear Ribosomal Dna Its Sequences, Nikolai Friesen, Reinhard M. Fritsch, Frank R. Blattner
Phylogeny And New Intrageneric Classification Of Allium (Alliaceae) Based On Nuclear Ribosomal Dna Its Sequences, Nikolai Friesen, Reinhard M. Fritsch, Frank R. Blattner
Aliso: A Journal of Systematic and Floristic Botany
The internal transcribed spacer region (ITS) of nuclear ribosomal DNA was sequenced from 195 representative species of Allium, two species of Nothoscordum, and one species each of lpheion, Dichelostemma, and Tulbaghia. Within the Allium species the lengths of the ITS regions were in a range from 612 to 661 base pairs and pairwise genetic distances reached up to 46%. The ITS data supported the inclusion of Nectaroscordum, Caloscordum, and Milula into Allium. Subgenera Rhizirideum and Allium, as well as sects. Reticulatobulbosa and Oreiprason were non-monophyletic taxa. Based on the phylogenetic relations, a new classification of genus Allium consisting of 15 …