`` `` killer '' '' , a substance extracted from stem tissue of etiolated pea seedlings ( pisum sativum l. v. alaska ) , interacts specifically with the far-red-absorbing form of phytochrome ( pfr ) in vitro in a temperature-independent , rapid , stoichiometric fashion to cause a loss of phytochrome photoreversibility .
C0031857
f phytochro
C0250581
e