Mode for Herbicidal Action of 2-Amino-3-chloro-1, 4-naphthoquinone (ACN)

Abstract

The characteristic mode for the herbicidal action of 2-amino-3-chloro-1, 4-naphthoquinone (ACN) was investigated by using autotrophic green microalgae (Scenedesmus acutus). The effects of ACN on the growth, chlorophyll content, protoporphyrin-IX accumulation, and ethane production in Scenedesmus cells were measured in comparison with three reference herbicides, i. e., ioxynil, dinoseb, and chlorophthalim. ACN appeared to have a different mechanism for action from these three herbicides. S. acutus cells grown with ACN produced ethane, but the mechanism for its production is considered to have been ditferent from that of chlorophthalim. ACN may inhibit porphyrin biosynthesis at a different stage from that by chlorophthalim.