Programa de Botánica Colegio de Postgraduados, Campus Montecillo Estado de México, 56230, México, E. Mail: marcossotohernandez@yahoo.com.mx.
*Correspondence author
2Departamento de Preparatoria Agrícola, Universidad Autónoma Chapingo, Km 38.5 Carretera México-Texcoco, Chapingo, Estado de México, 56230. México, E. Mail: rosgar08@hotmail.com.
It was evaluated the phytotoxic activity of Calia secundiflora seeds extracts on germination and seedling growth of Amaranthus hybridus and lettuce (Lactuca sativa). MS). Biotest was done at different concentrations of organic extract. The evaluated characters [germination speed index, germination (%), root length, shoot length, total plant length and abnormal plants] showed that the extract was more phytotoxic than isolated alkaloids. Cytisine was isolated and identified in these extracts and its concentration was 24.48%. The phytotoxic activity of extract was due to the synergic effects of other alkaloids. Lettuce and A. hybridus germination and seedling growth showed different responses to seed extracts. The phytotoxic effects of extracts were probably due to synergic effects of all alkaloids present in it.
Calia secundiflora, cytisine, extract, Fabaceae, phytotoxicity, quinolizidine alkaloids
