ISSN:
1432-2048
Keywords:
High irradiance response
;
Hypocotyl elongation
;
Photomorphogenesis
;
Phytochrome
;
Sinapis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Relative quantum responsivity curves for inhibition of hypocotyl elongation in Sinapis alba L. seedlings previously grown in white light confirm that a marked “end of day” inhibition response can be induced by a monochromatic light treatment (30 min) at the end of the light period. In dark grown seedlings, however, no growth inhibition can be induced by a 30 min monochromatic light treatment. A prerequisite for an induction response appears to be a pretreatment with continuous light. Far red light is most effective with blue and red light showing a lesser effectiveness. The light pretreatment also shows a marked fluence rate dependency with respect to its ability to allow an induction response to manifest itself. The pretreatment required shows all the characteristics of a classical “HIR” response. The appearance of the effect in plants treated with the herbicide SAN 9789 seems to exclude chlorophyll as being the photoreceptor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00387814
