At progressively later moments after the beginning of the imbibition a single red irradiation(R) has been given to the positive photoblastic seeds of Chenopodium album. It could be demonstrated that not only the final germination percentage, but also the period between R and the visible germination, are dependent on the irradiation moment.

Acta botanica neerlandica

CC BY 3.0 NL ("Naamsvermelding")

Koninklijke Nederlandse Botanische Vereniging

C.M. Karssen. (1967). The light promoted germination of the seeds of Chenopodium album L; I. The influence of the incubation time on quantity and rate of the response to red light. Acta botanica neerlandica, 16(4), 156–160.