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Germination of Seeds of Perennial Pepperweed (Lepidium latifolium)

  • Gerald K. Miller (a1), James A. Young (a2) and Raymond A. Evans (a2)

Abstract

Perennial pepperweed (Lepidium latifolium L. # LEPLA) is a serious weed of meadows and riparian habitats in the intermountain area of the western United States. Germination of seeds of this species was tested at 55 constant- and alternating-temperature regimes. No significant differences were found in mean germination at a range of temperatures varying from 0 to 40 C for seedlots collected at the same site in different years or at different locations in the same year. Optimum germination not significantly (P = 0.01) lower than the maximum observed occurred most frequently at 5/40 C (5 C for 16 h and 40 C for 8 h), and 10/40 and 15/40 C. Germination was enhanced by alternating regimes with low night temperatures (0, 2, or 5 C) and high day temperatures (35 and 40 C), in comparison with more moderate constant-temperature regimes.

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References

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1. Evans, R. A., Easi, D. A., Book, D. N., and Young, J. A. 1982. Quadratic response surface analysis of seed-germination trials. Weed Sci. 30:411416.
2. Evans, R. A., Holbo, H. R., Eckert, R. E. Jr., and Young, J. A. 1970. Functional environment of downy brome communities in relation to weed control and revegetation. Weed Sci. 18:154162.
3. Munz, P. A. and Keck, D. D. 1959. A California Flora. Univ. of California Press, Berkeley, CA. 1681 pp.
4. Robbins, W. W., Bellue, M. K., and Ball, W. S. 1951. Weeds of California. State Printing Office, Sacramento, CA. 547 pp.
5. Young, J. A. and Evans, R. A. 1982. Temperature profiles for germination of cool season range grasses. U.S. Dep. Agric., Agric. Res. Results ARR-W-27. Agric. Res. Serv., Oakland, CA. 92 pp.

Keywords

Germination of Seeds of Perennial Pepperweed (Lepidium latifolium)

  • Gerald K. Miller (a1), James A. Young (a2) and Raymond A. Evans (a2)

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