title: Interaction of light and temperature on seed germination of Rumex obtusifolius L.
abstract: Germination of Rumex obtusifolius L. seeds (nutlets) is low in darkness at 25° C. Germination is stimulated by exposure to 10 min red light (R) and also by a 10-min elevation of temperature to 35° C. A 10-min exposure to far-red light (FR) can reverse the effect of both R (indicating phytochrome control) and 35° C treatment. Fluence-response curves for this reversal of the effect of R and 35° C treatments are quantitatively identical. Treatment for 10 min with light of wavelenght 680, 700, 710 and 730 nm, after R and 35° C treatment, demonstrates that germination induced by 35° C treatment results from increased sensitivity to a pre-existing, active, far-red-absorbing form of phytochrome (Pfr) in the seeds.
authors.affiliation: Plant Biology Department, The University, NE1 7RU, Newcastle upon Tyne, UK.
authors.forename: D J
authors.initials: DJ
authors.lastname: Hand
authors.forename: G
authors.initials: G
authors.lastname: Craig
authors.forename: M
authors.initials: M
authors.lastname: Takaki
authors.forename: R E
authors.initials: RE
authors.lastname: Kendrick