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Dedicated bioenergy crops require certain characteristics to be economically viable and environmentally sustainable. Perennial grasses, which can provide large amounts of biomass over multiple years, are one option being investigated to grow on marginal agricultural land. Recently, a grass species (Brachypodium distachyon) has been developed as a model to better understand grass physiology and ecology. Here, we report on the flowering time variability of natural Brachypodium accessions in response to temperature and light cues. Changes in both environmental parameters greatly influence when a given accession will flower, and natural Brachypodium accessions broadly group into winter and spring annuals. Similar to what has been discovered in wheat and barley, we find that a portion of the phenotypic variation is associated with changes in expression of orthologs of VRN genes, and thus, VRN genes are a possible target for modifying flowering time in grass family bioenergy crops.

Natural Variation of Flowering Time and Vernalization Responsiveness in Brachypodium distachyon