Allelopathic Activity and Oxalate Content in Oxalate-rich Plants.

概要

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The allelopathic activity of the exudate of dry leaf from 53 species known to be rich in oxalates, including the families Polygonaceae, Oxalidaceae, Chenopodiaceae, Begoniaceae and Musaceae was assayed by the "Sandwich Method" (S W Method) using lettuce (Lactuca sativa L. var. Great Lakes 366) as a receptor plant. A wide interspecific variation in the allelopathic activity was recognized in these species (Tables 1, 2). Particularly, Oxalis corniculata L. and Begonia spp. inhibited the elongation of the lettuce radicle and hypocotyl at less than about 10% of the control (Fig. 1). The total oxalate contents (including soluble and non-soluble types) in dry leaf were determined for 18 species (Table 3). The total oxalate contents obtained were negatively and significantly associated with the radicle elongation of lettuce (% of control) in the SW method (Figs. 2, 3), suggesting that the oxalates in the dry leaf of oxalate-rich plants contributed, at least partly, to their allelopathic effect. Since several species, on the other hand, deviated from this relationship of oxalate contents and allelopathic activity, the chemical forms of oxalates and/or other unknown inhibitory substances might also be involved in the allelopathic activity of these oxalate-rich plants.
日本雑草学会の論文