Comparison of Three Phytochrome-mediated Processes in the Hypocotyl of Mustard

摘要: Anthocyanin synthesis, hair formation, and the synthesis of ascorbic acid oxidase are all phytochrome-mediated reactions occurring in hypocotyl mustard (Sinapis alba L.), controlled by phytochrome actually located hypocotyl. A comparison these three showed that certain respects they differ greatly their response to light. The ability seedling respond light showing responses was strongly influenced state development seedling. White given very early after seed imbibition unable evoke any reactions. By 50 hours imbibition, systems were fully inducible addition actinomycin D a competent coincident with illumination inhibited responses. In contrast, cordycepin at this time anthocyanin but had no effect on formation. Cycloheximide when up several This suggests necessity for RNA protein light-induced expression reactions, species involved may have differing degrees polyadenylation. lag period between onset first display 3 about 5 Amounts sufficient give large increases levels formation gave much smaller increase synthesis. Hair greater sensitivity induction stages than did Following an inductive period, sensitive far red inhibition twice as long other two differences suggest which control also differ.