2.1.1.153 Purification, characterization, and kinetic mechanism of S-adenosyl-L-methionine: vitexin 2"-O-rhamnoside 7-O-methyltransferase of Avena sativa L Avena sativa 2.1.1.153 Tissue-distribution of secondary phenolic biosynthesis in developing primary leaves of Avena sativa L. Avena sativa