Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-25T06:28:53.506Z Has data issue: false hasContentIssue false

Light Filtration by Foliar Canopies: Significance for Light-Controlled Weed Seed Germination

Published online by Cambridge University Press:  12 June 2017

R. B. Taylorson
Affiliation:
Agr. Res. Serv., U. S. Dep. of Agr., Crops Research Division, Beltsville, Maryland
H. A. Borthwick
Affiliation:
Agr. Res. Serv., U. S. Dep. of Agr., Crops Research Division, Beltsville, Maryland

Abstract

Light from sunlight, incandescent, and fluorescent sources was filtered through fresh tobacco (Nicotiana tabaccum L.), corn (Zea mays L.), and soybean (Glycine max (L.) Merrill) leaves. The spectral quality of the leaf-filtered light showed that much more of the incident red energy was absorbed than the far-red. The effect of the leaf-filtered light on the phytochrome-controlled germination of six weed species was generally to inhibit germination of seeds given a stimulatory pre-irradiation of red light from a standard source. Germination of seeds with no pre-irradiation was either not promoted or promoted to various degrees. Unfiltered light, at intensities equivalent to those under the leaf filters, caused no comparable effects. These results indicate an effect of altered spectral quality of the leaf-filtered light on the ratio of inactive/active phytochrome (Pr/Pfr) in the underlying seeds. We suggest that such phenomena could influence the germination of weed seeds in the field.

Type
Research Article
Copyright
Copyright © 1969 Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Butler, W. L., Lane, H. C., and Siegelman, H. W. 1963. Nonphotochemical transformations of phytochrome in vivo. Plant Physiol. 38:514519.CrossRefGoogle ScholarPubMed
2. Mancinelli, A. L., Yaniv, Z., and Smith, P. 1967. Phytochrome and seed germination. I. Temperature dependence and relative Pfr levels in the germination of dark-germinating tomato seeds. Plant Physiol. 42:333337.Google Scholar
3. Toole, E. H., Hendricks, S. B., Borthwick, H. A., and Toole, V. K. 1956. Physiology of seed germination. Ann. Rev. Plant Physiol. 7:299324.CrossRefGoogle Scholar
4. Wesson, G. and Wareing, P. F. 1967. Light requirements of buried seed. Nature 213:600601.CrossRefGoogle Scholar