Inhibition of chlorophyll and carotenoid biosynthesis by the herbicide ICIA-0051
1993
Nandihalli, U.B. | Bhowmik, P.C. (Univ. of Massachusetts, Amherst (USA). Dept. of Plant and Soil Sciences)
The effect of ICIA-0051 [2-(2-chloro-4-(methylsulfonyl)benzoyl)-1,3-cyclohexanedione], an experimental herbicide, on chlorophyll (Chl) and carotenoid (Car) syntheses was investigated using cucumber cotyledon greening system. In ICIA-0051-treated tissues the Car content decreased earlier than the Chl content. ICIA-0051 reduced Chl b formation more than Chl a formation. Treatment of the cotyledons with 5-aminolevulinic acid (ALA) during the light, preceded by ICIA-0051 during the dark, partly reversed the inhibitory action of ICIA-0051. The activity of ICIA-0051 was expressed faster in greened cotyledons than in etiolated cotyledons upon irradiation. These results suggest that ICIA-0051-induced bleaching is due primarily to the inhibition of Car synthesis. However, ICIA-0051 may also interfere with the Chl biosynthesis
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