Project Summary
Considerable preliminary data were available, and we were
clearly poised back in 1994 for rapid progress in this area
due to recent technological, theoretical, and computational
improvements. However, several obstacles remained. No mechanism
existed for attacking this major effort in a cooperative,
coordinated manner. Certain groups were over-studied, other
groups nearly unknown. Data sets derived from different molecules
and different morphological character systems rarely included
the same basic taxa, thus they couldn't be compared. Current
analytical software, and the concepts behind it, needed improvements
to handle analyses of this size and complexity, as did data
storage and retrieval software. Standards for maintaining
and adding to phylogenetic data bases, both morphological
and molecular, needed to be discussed and then implemented.
The Green Plant Phylogeny Research Coordination Group (GPPRCG)
was formed in 1994 in order to remedy these shortcomings by
facilitating or initiating interactions between distinct research
groups that have independent foci yet entail some aspect of
green plant phylogeny or systematics. Over the period from
1994 to 1999, the community of researchers in this area was
brought together, and a high level of communication and coordination
achieved.
The first meetings needed to cover important, broad questions
regarding taxon sampling and data sampling. The primary themes
of the first two meetings were "where are we now?" and "what
else needs to be done?" The purpose of the two meetings was
two-fold. First, the group needed to establish a list of priorities
for taxon sampling. Deliberations on questions of taxon sampling
were divided into discussion sub-groups by taxonomic expertise.
Second, the research coordination group had to identify types
of characters, both morphological and molecular, that should
or need to be sampled for each taxon. As with the question
of taxon sampling, discussions of character sampling were
broken down by expertise when appropriate (e.g., gross morphology
vs. ultrastructure or chloroplast vs. nuclear genes). guide
for future data gathering. These decisions were publicized
on the web site as a guide for future data gathering, in a
new kind of matrix called a Data Availability Matrix
(DAM).
Later meetings covered two distinct topics, one theoretical
and one empirical, i.e., methods for analysis of large, heterogeneous
data sets, and phylogenetic analysis within the major
clades of green plants. The general goal common to all meetings
of the group has been to coordinate research across the community
by providing standardized taxon and character information
on our web site, and developing new means of extracting phylogenetic
information from these data.
Final meetings and workshops held in the last year of the
grant enabled groups of researchers to get together and plan
their specific collaborative analyses. These were in most
cases accompanied by series of talks for the public and preliminary
presentations of research in preparation for the Botanical
Congress. These included meetings of the green algal, fern,
liverwort, moss, and seed plant subgroups. The data and other
information shared at these workshops greatly increased the
coordination and impact of the final presentations at the
Congress.
The results of the GPPRCG were presented at a series of
eight interlocking symposia at
the XVI International Botanical Congress held in St. Louis,
Missouri, 1-7 August, 1999. All the data sets and findings
of these symposia will be reflected on the GPPRCG web site,
several series of papers in specialized professional journals,
a review paper commissioned by Science, as well as in a planned
book on the Phylogeny of Green Plants. This book will have
two sections, one giving the details of competing phylogenetic
hypotheses and the other discussing biological and evolutionary
subjects in light of the phylogeny.
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