title: Effect of light and temperature on the germination of lettuce seeds.
abstract: A short period (15-30 min) at 30° C promotes germination of seeds of Lactuca sativa L. cv. Repolhuda in darkness. Far-red light reverses this stimulation, and the escape curves for phytochrome and high-temperature action are quite similar, indicating that the two factors act at a common point in the chain of events leading to germination. It is suggested that high temperature acts by decreasing the threshold of the active, far-red absorbing, form of phytochrome (Pfr) needed to promote germination.
authors.affiliation: Departamento de Bioquímica, Universidade Federal de Permambuco, 50. 000, Recife, PE, Brasil.
authors.forename: M
authors.initials: M
authors.lastname: Takaki
authors.forename: V M
authors.initials: VM
authors.lastname: Zaia