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Milk Thistle (Silybum marianum) Seed Germination

Published online by Cambridge University Press:  12 June 2017

J. A. Young ,
R. A. Evans  and
R. B. Hawkes
J. A. Young
Affiliation:
Sci. and Ed. Admin., U.S. Dep. of Agric., Renewable Resources Center, Univ. of Nevada, Reno, NV 89512
R. A. Evans
Affiliation:
Sci. and Ed. Admin., U.S. Dep. of Agric., Renewable Resources Center, Univ. of Nevada, Reno, NV 89512
R. B. Hawkes
Affiliation:
Sci. and Ed. Admin., U.S. Dep. of Agric., Biological Control of Weeds, Albany, CA 94706
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Abstract

The germination of seeds (achenes) of milk thistle [Silybum marianum (L.) Gaertn.] was investigated. One month after harvest, milk thistle seeds had afterripening requirements related to germination temperature that limited germination to 10 to 20 C temperatures. The time required to satisfy afterripening requirements was dependent on germination temperature. Generally the higher the incubation temperature during germination, the longer the afterripening requirement (up to a maximum of 5 months). Once afterripening requirements were satisfied, milk thistle seeds germinated over a temperature range of from 0 to 30 C. Optimum germination occurred with 2 to 15 C 16-h cold periods alternating with 10 to 30 C 8-h warm periods. Emergence of milk thistle seedlings decreased with increased burial depth, but substantial emergence occurred from 8 cm. Germination on the surface of the soil or litter was greatly reduced compared to that with slight soil or litter coverage. Potassium nitrate (KNO3) added to the germination substrate at 1.0 mM enhanced the germination of milk thistle seeds at 2 and 5 C incubation temperatures.

Keywords

Seedbed ecologyafterripening
Type
Research Article
Information
Weed Science , Volume 26 , Issue 4 , July 1978 , pp. 395 - 398
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

Literature Cited

1. Evans, R. A. and Young, J. A. 1970. Plant litter and establishment of alien annual species in rangeland communities. Weed Sci. 18:697–703.Google Scholar
2. Evans, R. A. and Young, J. A. 1972. Microsite requirements for establishment of annual rangeland weeds. Weed Sci. 20:350–356.CrossRefGoogle Scholar
3. Evans, R. A., Young, J. A., and Kay, B. L. 1974. Germination of winter annual species from a rangeland community treated with paraquat. Weed Sci. 22:185–187.Google Scholar
4. Evans, R. A., Kay, B. L., and Young, J. A. 1975. Microenvironment of a dynamic annual community in relation to range improvement. Hilgardia 43(3):79–102.Google Scholar
5. Goeden, R. D. and Ricker, D. W. 1974. Imported seed weevils attack Italian and milk thistles in southern California. Calif. Agric. 28(2):8–9.Google Scholar
6. Hawkes, R. B., Andres, L. A., and Dunn, P. H. 1972. Seed weevil released to control milk thistle. Calif. Agric. 26:12):14.Google Scholar
7. Mayer, A. M. and Poljakoff-Mayber, A. 1963. The germination of seeds. Pergamon Press, Oxford. 236 pp.Google Scholar
8. Roberts, E. H. 1973. Oxidative processes and the control of seed germination. Pages 189–218 in Heydecker, H., ed. Seed Ecology. Penn State Univ. Press, University Park, Pennsylvania.Google Scholar
9. Robbins, W. W. 1940. Alien plants growing without cultivation in California. Calif. Agric. Exp. Stn. Bull. 637:1–128.Google Scholar
10. Robbins, W. W., Bellue, M. K., and Ball, W. S. 1951. Weeds of California. State of California. 547 pp.Google Scholar
11. Young, J. A. and Evans, R. A. 1973. Mucilaginous seed coats. Weed Sci. 21:52–54.Google Scholar
12. Young, J. A., Evans, R. A., and Eckert, R. E. Jr. 1969. Population dynamics of downy brome. Weed Sci. 17:20–26.Google Scholar
13. Young, J. A., Evans, R. A., and Eckert, R. E. Jr. 1969. Emergence of medusahead and other grasses from four seeding depths. Weed Sci. 17:376–379.Google Scholar
14. Young, J. A., Evans, R. A., and Kay, B. L. 1971. Germination of annual grasses in simulated litter. Agron. J. 63:551–555.Google Scholar
15. Young, J. A., Evans, R. A., and Kay, B. L. 1975. Dispersal and germination dynamics of broadleaf filaree, Erodium botrys (Cav.). Bertol. Agron. J. 67:54–57.Google Scholar