Journal of Chemical Ecology

, Volume 26, Issue 9, pp 2187–2196 | Cite as

Selective Phytotoxic Activity of Withanolides from Iochroma australe to Crop and Weed Species

  • Clarisa E. Vaccarini
  • Gloria M. Bonetto


Phytotoxic effects of Iochroma australe extract and 4,7,20-oxowithanolides were examined in Petri dish bioassays at 10, 100, and 1000 ppm. The extract and the major constituent (17S,20R,22R)-4β,7β,20α-trihydroxy-1oxowitha-2,5,24-trienolide (2) reduced growth of the radicle of the weeds Sorghum halepense (Monoct.) and Chenopodium album (Dicot.). Neither the extract nor withanolides had significant effect on germination or radicle length of the commercial crop species Lactuca sativa. From our experimental data we conclude that the withanolides tested here are natural products with selective herbicidal activity against weed species.

Phytotoxicity allelopathy withanolides Iochroma australe Solanaceae weed Sorghum halepense Chenopodium album crop Lactuca sativa 


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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • Clarisa E. Vaccarini
    • 1
  • Gloria M. Bonetto
    • 1
  1. 1.Departamento de Química Orgánica, Facultad de Ciencias QuímicasUniversidad Nacional de Córdoba, Instituto Multidisciplinario de Biología Vegetal (IMBIV) CONICET-UNCCórdobaArgentina

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