Abstract
Sublethal doses of γ-radiation and far red light have some-what analogous, red light reversible, effects on the germination of lettuce seeds (Lactuca sativa L. var. Grand Rapids). However, the mechanism by which γ-radiation retards germination appears to differ from that of far red light. Compared to controls, γ-radiation retarded germination for the first 24 hours; but after 36 or 48 hours of imbibition gemination of treated seeds was higher than that of the controls, whether or not the γ-irradiated seeds received red or far red light. The effects of γ-radiation are more pronounced in seeds containing 15% water at the time of treatment than in those containing only 7% water. The promotive action of red light is operative in the presumed absence of cell division in γ-treated seeds.
Full text
PDF
Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Conger B. V., Nilan R. A., Konzak C. F. The role of water content in the decay of radiation-induced oxygen-sensitive sites in barley seeds during post-irradiation hydration. Radiat Res. 1969 Jul;39(1):45–56. [PubMed] [Google Scholar]
- Haber A. H., Luippold H. J. Effects of Gibberellin, Kinetin, Thiourea, and Photomorphogenic Radiation on Mitotic Activity in Dormant Lettuce Seed. Plant Physiol. 1960 Jul;35(4):486–494. doi: 10.1104/pp.35.4.486. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Haber A. H., Luippold H. J. Separation of Mechanisms Initiating Cell Division and Cell Expansion in Lettuce Seed Germination. Plant Physiol. 1960 Mar;35(2):168–173. doi: 10.1104/pp.35.2.168. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hsiao A. I., Vidaver W. Water Content and Phytochrome-induced Potential Germination Responses in Lettuce Seeds. Plant Physiol. 1971 Feb;47(2):186–188. doi: 10.1104/pp.47.2.186. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nitsan J., Lang A. Inhibition of cell division and cell elongation in higher plants by inhibitors of DNA synthesis. Dev Biol. 1965 Dec;12(3):358–376. doi: 10.1016/0012-1606(65)90003-5. [DOI] [PubMed] [Google Scholar]