Phytochrome Transformation and Action in Seeds of Rumex crispus L. during Secondary Dormancy
AUTOR(ES)
Taylorson, R. B.
RESUMO
Promotion of germination by red light fails after prolonged dark imbibition of Rumex crispus L. seeds, indicative of a secondary dormancy. The degree and rate of inception of the dormancy increases with increasing temperature. Following establishment of the dormancy, germination response to red light can be restored by either prolonged cold treatment or brief high temperature shifts. Loss of phytochrome was not a factor in the initial establishment of the dormancy. When the seeds are in secondary dormancy, the chromophore of phytochrome can be transformed to the far red-absorbing form, but the far red-absorbing form cannot induce germination. The responses to changes in temperature suggested dependence of germination on order ⇆ disorder transitions in components of the seeds.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366527Documentos Relacionados
- Phytochrome Control of Germination of Rumex crispus L. Seeds Induced by Temperature Shifts
- Action of Phytochrome During Prechilling of Amaranthus retroflexus L. Seeds
- Ethylene Inhibition of Phytochrome-Induced Germination in Potentilla norvegica L. Seeds
- Changes in Phytochrome Expressed by Germination of Amaranthus retroflexus L. Seeds
- Induction of Secondary Dormancy in Chenopodium bonus-henricus L. Seeds by Osmotic and High Temperature Treatments and Its Prevention by Light and Growth Regulators 1