Classification within Eragrostis, a large genus of ca. 400 species in Poaceae subfamily Chloridoideae, has long been problematic. While spikelet disarticulation characters have been the most common basis of infrageneric classifications, they have not been demonstrated to describe monophyletic groups. An alternative classification system linked to leaf blade anatomy characters is explored using phylogenies based on DNA sequence data from three loci (nuclear GBSSI, plastid rps16, and the plastid trnL-F region) in this study. Eragrostis possesses a great deal of variation in leaf blade anatomy, ranging from NAD-ME-like in structure (subgenus Eragrostis) to PCK-like (subgenus Caesiae), with some intermediates between these extremes. This study reveals that a great deal of variation exists in those species traditionally classified as “intermediate” in leaf blade anatomy. It also indicates that the PCK-like species form a monophyletic group in phylogenetic analyses based on plastid data, GBSSI sequences, and simultaneous analysis of all loci. NAD-ME-like and intermediate species do not form monophyletic groups, but phylogenies based on plastid sequences indicate some evolutionary conservation of the various types of intermediate anatomy. This study also evaluates the leaf anatomy type in allopolyploids. A high proportion of these allopolyploids have intermediate leaf anatomy, potentially reflecting their derivation from progenitors with distinct anatomical types.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.