Physcomitrella patens is a model organism used for
studying plant evolution, development and physiology because the
species is a basal lineage of land plants (first land plants).
Thus, the species is considered to be at an important phylogenetic
position for understanding evolution to 'higher' plants. P.
patens has also emerged as a model plant because of its high
homologous recombination frequency that enables efficient gene
targeting, a relatively simple morphology and a small genome size
(~500Mb). The moss genome contains 27 chromosomes with 32,926 loci
encoding 87,533 protein-coding transcripts.