Hormonal regulation of phosphatidylcholine synthesis in plants. The inhibition of cytidylyltransferase activity by indol-3-ylacetic acid.
Indol-3-ylacetic acid stimulated stem elongation within 1 h of treatment of Pisum sativum L. cv. Feltham First stem sections. This elongation was accompanied by an increase in the endogenous level of phosphocholine and a decrease in that of CDP-choline. Measurements in vitro of the CDP-base pathway enzymes showed an increase in choline phosphotransferase and a decrease in cytidylyltransferase activity on hormone treatment. These results indicate that the decrease in phosphatidylcholine labelling from [14C]choline that is observed on indol-3-ylacetic acid treatment of pea stem sections is caused by the decrease in cytidylyltransferase activity.
D002794:Choline / Q000378:metabolism; D019916:Choline-Phosphate Cytidylyltransferase; D003566:Cytidine Diphosphate Choline / Q000378:metabolism; D007887:Fabaceae / Q000378:metabolism; D007210:Indoleacetic Acids / Q000494:pharmacology*; D009713:Nucleotidyltransferases / Q000037:antagonists & inhibitors*; D010713:Phosphatidylcholines / Q000096:biosynthesis*; D010767:Phosphorylcholine / Q000378:metabolism; D063245:Plant Development; D010944:Plants / Q000187:drug effects / Q000378:metabolism*; D010946:Plants, Medicinal
D007210:Indoleacetic Acids; D010713:Phosphatidylcholines; D010767:Phosphorylcholine; D003566:Cytidine Diphosphate Choline; C030737:indoleacetic acid; D009713:Nucleotidyltransferases; D019916:Choline-Phosphate Cytidylyltransferase; D002794:Choline