Abstract
Six commercial quinones (2,5 - dihydroxy-1,4-benzoquinone [1], camphorquinone [2], phenantrequinone [3], anthrarufin [4], sodium sulfonate anthraquinone [5] and lapachol [6]) were tested as for their phytotoxic potential. The compounds were tested on Sorghum bicolor , Cucumis sativus , and Desmodium tortuosum cultivated in washed sand in Petri dishes and on Lactuca sativa , Cucumis sativus , Desmodium tortuosum , Hyptis suaveolens and Euphorbia heterophylla , cultivated in pots, containing washed sand, for 20 days. In the tests in Petri dishes, quinone 2 caused a little inhibition (25.62%) to the development of S. bicolor . Quinones 1, 2, 3 and 5 caused a very little effect on C. sativus . None of the tested quinones caused a significant inhibition effect to D. tortuosum . In the bioassays in pots, quinones 2, 3, 4 and 6 caused a significant inhibition (9.52 to 71.43%) to the root system of H. suaveolens
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