title: High molecular weight UMP-rich RNA of germinating wheat embryo.
abstract: The synthesis of a relatively homogeneous RNA fraction was observed in germinating wheat embryo. The fraction synthesised within the first 3 h of germination had a high molecular weight (approx. 2.10(6)) and a specific nucleotide composition. In particular, the UMP content was unusually high (47 mol%). The high UMP content resulted probably from the presence of UMP-rich regions within the newly-synthesised polynucleotide chain. Neither ribosomal nor transfer DNA sequences were transcribed at the same time. It is suggested that the newly-synthesised RNA fraction represents an mRNA precursor and is transcribed in the immediate response of wheat embryo to the environmental stimuli to germinate.
mesh_terms: D001483:Base Sequence; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D010944:Plants / Q000378:metabolism*; D012313:RNA / Q000096:biosynthesis* / Q000302:isolation & purification; D014158:Transcription, Genetic; D014908:Triticum / Q000378:metabolism; D014500:Uracil Nucleotides / Q000032:analysis
chemical_list: D014500:Uracil Nucleotides; D012313:RNA