Photoperiodism and Related Phenomena in Plants and Animals: Proceedings

absorption acid action activity amount animals appears auxin beginning birds blue breeding buds caused cells changes clock compared complete concentration constant continuous curve cycle daily dark dark period day length determined discussed effect elongation endogenous energy evidence experimental experiments exposure fact factors far-red floral flowering function further germination gibberellic acid gibberellin given gonadal growth hormone important increase indicated induction influence inhibition inhibitor initiation intensity involved irradiation leaf leaves long days measured mechanism nature night normal observed obtained occur organism period phase photoperiodic Physiol physiological pigment plants possible present processes production promoted reaction red light REFERENCES region relation relatively reproductive response reversible rhythm season seed seems shift short days shown similar species spectrum stem stimulus studies suggest Table temperature tion treatment various Xanthium