Molecular Biology and Evolution, Vol 13, 1141-1150, Copyright © 1996 by Society for Molecular Biology and Evolution
S Mathews and RA Sharrock
The phytochrome nuclear gene family encodes photoreceptor proteins that
mediate developmental responses to red and far red light throughout the
life of the plant. From studies of the dicot flowering plant Arabidopsis,
the family has been modeled as comprising five loci, PHYA- PHYE. However,
it has been shown recently that the Arabidopsis model may not completely
represent some flowering plant groups because additional PHY loci related
to PHYA and PHYB of Arabidopsis apparently have evolved independently
several times in dicots, and monocot flowering plants may lack orthologs of
PHYD and PHYE of Arabidopsis. Nonetheless, the phytochrome nucleotide data
were informative in a study of organismal evolution because the loci occur
as single copy sequences and appear to be evolving independently. We have
continued our investigation of the phytochrome gene family in flowering
plants by sampling extensively in the grass family. The phytochrome nuclear
DNA data were cladistically analyzed to address the following questions:
(1) Are the data consistent with a pattern of differential distribution of
phytochrome genes among monocots and higher dicots, with homologs of PHYA,
B, C, D, and E present in higher dicots, but of just PHYA, B, and C in
monocots, and (2) what phylogenetic pattern within Poaceae do they reveal?
Results of these analyses, and of Southern blot experiments, are consistent
with the observation that the phytochrome gene family in grasses comprises
the same subset of loci detected in other monocots. Furthermore, for
studies of organismal phylogeny in the grass family, the data are shown to
provide significant support for relationships that are just weakly resolved
by other data sets.
ORIGINAL ARTICLE
The phytochrome gene family in grasses (Poaceae): a phylogeny and evidence that grasses have a subset of the loci found in dicot angiosperms
Department of Biology, Montana State University, USA. smathews@oeb.harvard.edu
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