title: Plant sample from Panicum hallii
organism: Panicum hallii
description: Photoperiodic responses are generated by the integration of light perception and clock entrainment. Key components of the photoperiodic flowering pathway have been identified in many species, but surprisingly few studies have globally examined the dynamics of clock oscillation with changes in day-length. Here, we characterize 9,010 photoperiod responsive genes with strict statistical testing across a diurnal time series in the C4 perennial grass, Panicum hallii. We show that the vast majority of photoperiod responses are driven by complex interactions between the photoperiod treatment and sampling periods and are caused by both rank changing and predominance expression patterns. Gene ontology (GO) enrichment analysis with predominantly expression genes at each sampling time indicated dynamic reprogramming of important processes in the changing day-length. We observed that photoperiod interaction largely drives phase shift behaviors. Moreover, we identified 10 transcription factor (TF) families enriched in photoperiodic responses, including the conserved Grain number, plant height and heading date7-Early heading date1 (PhGhd7-PhEhd1) regulatory module from CCT MOTIF FAMILY (CMF) and RESPONSE REGULATOR (RR) families. Finally, co-expression analysis of GIGANTEA homolog (PhGI) provided insight into potential interaction partners of this hub gene. Our results provide a valuable resource for understanding the mechanisms of photoperiod regulation in perennial grasses.
attributes.tag: isolate
attributes.value: P. hallii var. filipes (FIL2 genotype)
attributes.tag: cultivar
attributes.value: P. hallii var. filipes (FIL2 genotype)
attributes.tag: ecotype
attributes.value: Lowland
attributes.tag: age
attributes.value: 15 days after germination
attributes.tag: dev_stage
attributes.value: vegetative stage
attributes.tag: geo_loc_name
attributes.value: USA:Texas
attributes.tag: tissue
attributes.value: Leaf
attributes.tag: BioSampleModel
attributes.value: Plant