Summary Allelopathic alkaloids from Datura stramonium seeds remained phytotoxic to Helianthus annuus for 15 weeks in soil under field conditions. Studies using transmission electron microscopy showed that these alkaloids retarded the metabolism of food reserves, particularly starch, in germinating H. annuus seeds. Structural damage to cells and organelles was not apparent.
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Levitt et al. (1984) studied this question.
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