New Phytotoxic Cassane-like Diterpenoids from Eragrostis plana

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Abstract
Eragrostis plana (Nees) is an allelopathic plant with invasive potential in South American pastures. To isolate and identify phytotoxic compounds from leaves and roots of E. plana, a bioassay-directed isolation of the bioactive constituents was performed. This is the first report on a new diterpene carbon skeleton, the neocassanes, and of three new neocassane diterpenes, neocassa-1,12(13),15-triene-3,14-dione, 1, 19-norneocassa-1,12(13),15-triene-3,14-dione, 2, and 14-hydroxyneocassa-1,12(17),15-triene-3-one, 3, identified from the roots. Compounds 1, 2, and 3 inhibited the growth of duckweed 50% at concentrations of 109 ± 28, 200 ± 37, and 59 ± 15 µM, respectively. Compound 2 was fungicidal to Colletotrichum fragariae, C. acutatum and C. gloeosporioides. The compounds identified here could explain the allelopathy of E. plana. The description of the newly discovered compounds, besides contributing to the chemical characterization of the species, may be the first step in the study of the potential of these compounds as bioherbicides.
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  • Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (PDSE-No 19/2016)

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