Plant Physiol.
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Plant Physiology 69:1212-1216 (1982)
© 1982 American Society of Plant Biologists

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Articles

Quantification of Allelopathic Potential of Sorghum Residues by Novel Indexing of Richards' Function Fitted to Cumulative Cress Seed Germination Curves 1

Fredric R. Lehle and Alan R. Putnam

Department of Horticulture, Pesticide Research Center, Michigan State University, East Lansing, Michigan 48824

The inhibitory activity of aqueous extracts of field-grown sorghum (Sorghum bicolor cv. Bird-a-boo) herbage and roots was quantitatively indexed by three aspects of cumulative cress (Lepidium sativum cv. Curlycress) seed germination: the germination onset; weighted mean rate; and final germination percentage. Extract potency was greatest for herbage collected four weeks after planting but declined sharply thereafter as the plants matured. About 91% of the inhibitory activity obtained from four-week-old herbage was in a low molecular weight fraction. Differential effects of herbage and root extracts on cress seed germination suggest that the nature and/or proportion of biologically active substances extractable from these plant parts is dissimilar.

1 Supported by United States Department of Agriculture, Science and Education Administration, Competitive Grant 801-0410-07040 (to A. R. P.). Michigan Agricultural Experiment Station Journal Article No. 9536.






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Copyright © 1982 by the American Society of Plant Biologists