Evidence for a Phytochrome-Mediated Phototropism in Etiolated Pea Seedlings 1
AUTOR(ES)
Parker, Karen
RESUMO
Entirely etiolated pea seedlings (Pisum sativum, L. cv Alaska) were tested for a phototropic response to short pulses of unilateral blue light. They responded with small curvatures resembling in fluence-dependence and kinetics of development a phytochrome-mediated phototropic response previously described in maize mesocotyls. Irradiations from above with saturating red or far-red light, either immediately before or after the unilateral phototropic stimulus, strongly reduced or eliminated subsequent positive phototropic curvature. Only blue light from above, however, entirely eliminated curvature at all fluences of stimulus. It is concluded that the phototropism is primarily a result of phytochrome action.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1055869Documentos Relacionados
- Phytochrome-mediated Electric Potential Changes in Oat Seedlings 1
- Phytochrome-Mediated Control of Diamine Oxidase Level in the Epicotyl of Etiolated Lentil (Lens culinaris Medicus) Seedlings 1
- Rapid Phytochrome-mediated Changes in Adenosine 5′-Triphosphate Content of Etiolated Bean Buds 1
- Phytochrome Control of Another Phytochrome-mediated Process 1
- Effect of Temperature on Phytochrome-mediated Responses in Seedlings of Mustard