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Abstract Detail

Systematics Section

Rai, Hardeep [1], Chonofsky, Mark [1], Kelch, Dean [2], Cronn, RC [3], Parks, Matthew [4], Nagalingum, Nathalie [1], Vo, Amy [1], Liston, Aaron [4], Mathews, Sarah [1].

Generic and familial relationships within conifers inferred from nuclear data.

Extant conifers (Coniferae) comprise approximately 700 species in 70 genera. Currently, systematists recognize 6-8 conifer families. Independent lines of evidence have provided support for the monophyly of Pinaceae and of Cupressophyta (all other extant conifers). If gnetophytes are excluded from conifers, these two clades are sister taxa. Within cupressophytes, a close relationship between the southern hemisphere Araucariaceae and Podocarpaceae has been supported, as has the recircumscription of Taxodiaceae, now included in Cupressaceae. However, uncertainty remains regarding the relative positions of Cephalotaxaceae, Cupressaceae, and Taxaceae. Moreover, a robust test of familial relationships inferred from plastid data is lacking, and in many cases, generic relationships remain to be elucidated. We are surveying multiple, independently evolving phytochrome loci and associated intronic regions from a large number of genera representing all 8 conifer families. In initial trees inferred from incomplete phytochrome matrices, Cephalotaxaceae are sister to, rather than nested in Taxaceae, and within Podocarpaceae, Prumnopitys is the sister group of a clade that includes Parasitaxus as the sister group of Manoao/Lagarostrobos.

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1 - Harvard University, Arnold Arboretum, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, MA, 02138, USA
2 - California Department of Food & Agriculture, 3294 Meadowview Road, Sacramento, California, 95832, USA
3 - US Forest Service, Pacific NW Research Station, Genetics, 3200 SW Jefferson Way, Corvallis, Oregon, 97331, USA
4 - Oregon State University, Department of Botany and Plant Pathology, 2082 Cordley Hall, Corvallis, OR, 97331, USA

none specified

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 56
Location: Cottonwood C/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 8:00 AM
Number: 56001
Abstract ID:773