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15,21-Cyclowithanolides from Jaborosa bergii

“…Previous work in our laboratory demonstrated that withanolides show selective phytotoxic effects on some monocotyledoneous and dicotyledoneous species . To evaluate compound 1 as a potential phytotoxic agent, a number of bioassays were undertaken on two monocotyledoneous and three dicotyledoneous species.…”

“…Previous work in our laboratory demonstrated that withanolides show selective phytotoxic effects on some monocotyledoneous and dicotyledoneous species. 3 To evaluate compound 1 as a potential phytotoxic agent, a number of bioassays were undertaken on two monocotyledoneous and three dicotyledoneous species. The effect produced by 1 on germination was not significant in the species assayed; however, significant inhibition of radicle growth was found at 2 × 10 -3 M on the dicotyledoneous species Chenopodium album, Ipomea purpurea, and Lactuca sativa (phytogrowth inhibitory activity > 49%).…”

“…Many of these compounds exhibit interesting biological activities such as antifeedant, insecticide, and immunosuppressive properties, and they are inducers of the enzyme quinone reductase . Recently withanolides isolated from Iochroma australe showed phytotoxic activity on crop and weed species, as well as selective effects on germination and radicle growth …”

“…2 Recently withanolides isolated from Iochroma australe showed phytotoxic activity on crop and weed species, as well as selective effects on germination and radicle growth. 3 Jaborosa Miers is a South American genus belonging to the Solanaceae family that comprises about 23 species, 4 11 of which are almost exclusively distributed in Argentina. Previous studies on a population of J. bergii Hieron.…”

Natural withanolides: an overview

“…Neither the extract nor the withanolide had a significant effect on germination or radicle length of the commercial crop species Lactuca sativa, making these withanolides selective herbicides. 210 Jaborosalactol 18 (257) from Jaborosa bergii also showed significant inhibition of radicle growth at 2 Â 10 À3 M in the dicotyledoneous species. On the other hand, growth was stimulated in the monocotyledoneous species, making jaborosalactol 18 (257) a selective phytogrowth controller.…”