G protein signaling in the regulation of rice seed germination.
Seed germination and early seedling growth are regulated by an intricate network of hormonal signaling pathways. The plant hormones gibberellic acid (GA) and abscisic acid (ABA) are particularly important positive and negative regulators of these processes, respectively. In the cereal rice, mutant analysis has implicated heterotrimeric guanine nucleotide-binding protein (G protein) signaling in GA-stimulated expression of several genes, including expression of the gene encoding the hydrolytic enzyme alpha-amylase, which breaks down carbohydrate reserves and thus mobilizes nutrients that nourish the young seedling.
Assmann
Sarah M
SM
Biology Department, Penn State University, 208 Mueller Laboratory, University Park, PA 16802, USA. sma3@psu.edu
D017360:Arabidopsis / Q000235:genetics / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology; D019204:GTP-Binding Proteins / Q000235:genetics / Q000502:physiology*; D018525:Germination; D008954:Models, Biological; D012275:Oryza / Q000235:genetics / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology*; D012639:Seeds / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology*
D029681:Arabidopsis Proteins; D010940:Plant Proteins; D019204:GTP-Binding Proteins