Summary:The effects of paraquat and 2,4,5‐T on the photochemical activities of chloroplasts from the leaves of the woody speciesCarissa spinarum, Maba buxifolia, Flacourtia sepiaria, Chomelia asiatica, Gymnosporia emarginataandDodonaea viscosawere investigated by comparing the effects on isolated chloroplasts from untreated leaves with those on chloroplasts isolated from herbicide‐sprayed plants. DCPIP and NADP reduction of chloroplasts incubated in paraquat or 2,4,5‐T solution was inhibited, whereas that of chloroplasts isolated from most species sprayed with these herbicides was enhanced after 24 and 48 h. The enhancement was smaller or disappeared after 72 h. The cyclic and noncyclic photophosphorylation rates were suppressed in chloroplasts isolated from herbicide‐treated plants, and also in those from most untreated plants incubated in the herbicide solutions. The differences in reactions of chloroplasts from herbicide‐treated and untreated plants are
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