Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Transcriptional regulatory programs underlying barley germination and regulatory functions of Gibberellin and abscisic acid | An and Lin BMC Plant Biology 2011 11 105 http 1471-2229 11 105 BMC Plant Biology RESEARCH ARTICLE Open Access Transcriptional regulatory programs underlying barley germination and regulatory functions of Gibberellin and abscisic acid Yong-Qiang An1 and Li Lin2 Abstract Background Seed germination is a complex multi-stage developmental process and mainly accomplished through concerted activities of many gene products and biological pathways that are often subjected to strict developmental regulation. Gibberellins GA and abscisic acid ABA are two key phytohormones regulating seed germination and seedling growth. However transcriptional regulatory networks underlying seed germination and its associated biological pathways are largely unknown. Results The studies examined transcriptomes of barley representing six distinct and well characterized germination stages and revealed that the transcriptional regulatory program underlying barley germination was composed of early late and post-germination phases. Each phase was accompanied with transcriptional upregulation of distinct biological pathways. Cell wall synthesis and regulatory components including transcription factors signaling and post-translational modification components were specifically and transiently up-regulated in early germination phase while histone families and many metabolic pathways were up-regulated in late germination phase. Photosynthesis and seed reserve mobilization pathways were up-regulated in post-germination phase. However stress related pathways and seed storage proteins were suppressed through the entire course of germination. A set of genes were transiently up-regulated within three hours of imbibition and might play roles in initiating biological pathways involved in seed germination. However highly abundant transcripts in dry barley and Arabidopsis seeds were significantly conserved. Comparison with transcriptomes of barley aleurone in response to GA and ABA .
