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Herbaceous model species,especially Arabidopsis has provided a wealth of information about the genes involved in floral induction and development of inflorescences and flowers.While the genus Populus is an important model system for the molecular biology of woody plant.These two genuses differ in many ways.This study was designed to improve understanding of flower development in poplar at a system level,as its regulatory pathway to a large extent remains poorly known,owing to the presently limited mutant pool.To address this issue,a poplar GeneChip was employed to detect genes expressed during the whole floral developmental process.Using the expressed floral genes,a systematic gene network was constructed with the aid of functional association with Arabidopsis.The results suggested that autonomous,gibberellin,vernalization,photoperiod,ethylene,brassinosteroid,stress-induced and floral suppression pathways are involved in poplar flowering.Modularity analysis revealed several pathways in common with Arabidopsis,such as autonomous,gibberellin,vernalization and photoperiod pathways.In addition,brassinosteroid,stress-induced and floral suppression pathways were implicated as additional novel pathways.Notably,a difference in vernalization between Arabidopsis and poplar was revealed.Autonomous,gibberellin,vernalization,photoperiod,ethylene,brassinosteroid,stress-induced and floral suppression pathways integrated into a systematic gene network in floral development of poplar.Compared to Arabidopsis,brassinosteroid,stress-induced and floral suppression pathways are additional in poplar,and FLC is absent in vernalization pathway in poplar.Preliminary conclusions drawn here provide a basis for both identification of key genes and elucidation of molecular mechanisms involved in poplar floral development.