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Germination Characteristics of Three Species of Cruciferae

Published online by Cambridge University Press:  12 June 2017

James A. Young ,
Raymond A. Evans ,
Richard O. Gifford  and
Richard E. Eckert Jr.
James A. Young
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr.
Raymond A. Evans
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr.
Richard O. Gifford
Affiliation:
Plant, Soil, and Water Science, University of Nevada, Reno
Richard E. Eckert Jr.
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr.
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Abstract

Germination of tumble mustard (Sisymbrium altissimum L.), tansy mustard (Descurainia pinnata (Walt.) Britton), and yellowflower pepperweed (Lepidium perfoliatum L.) is partially dependent on total degree hours of incubation (temperature above 0 C times the duration of incubation). This relation was similar under constant or alternating temperatures. Alternating temperature regimes with −20 C inhibited germination, and greatly depressed subsequent germination at optimum temperatures. Tansy mustard and yellowflower pepperweed have temperature-dependent after-ripening requirements. Germination of all three species responded similarly to osmotic stress. The relation between tumble mustard germination under osmotic or soil moisture stress is dependent on the texture of the soil substrate. A mucilaginous coating greatly aids the germination of yellowflower pepperweed seeds on the surface of media under low (0.05 to 0.2 bars) moisture tension. Germination of seeds of the three species recovered in soil samples from the field is radically different from that of freshly harvested material. The seeds acquire a dormancy which is broken irregularly under ideal conditions for germination.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 1 , January 1970 , pp. 41 - 48
Copyright
Copyright © 1970 Weed Science Society of America 

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References

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