Quantification of allelopathic potential of sorghum residues by novel indexing of Richards' function fitted to cumulative cress seed germination curves
FR Lehle, AR Putnam - Plant Physiology, 1982 - academic.oup.com
FR Lehle, AR Putnam
Plant Physiology, 1982•academic.oup.comThe 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 …
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 …
Abstract
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.