Effect of pesticidal treatment and type of soil on wheat and cotton seedling leaves contents of chlorophyll and carotenoids
2011
Salem, R.E.M. | El-Tantawy, M.A. | Aioub, A.A. | Gouhar, K.A.
The intrinsic phytotoxicity of six pesticides, namely: butralin, clodinafop - propargyl, bromoxynil, imidacloprid, malathion and carbosulfan against the three photosynthetic pigments chlorophyll a, chlorophyll b and carotenoids of cotton and wheat seedling leaves, cultivated in two types of soil was investigated. It was found that the content of imidacloprid, butralin, and carbosulfan - treated cotton seedling leaves of chlorophyll a, chlorophyll b and carotenoids were reduced in clay loam soil cultivation, i.e., the used pesticides acted as inhibitor for the biosynthesis of the three pigments. With the sandy clay loam cultivation, imidacloprid and butralin acted as inducers whereas the third compound carbosulfan exhibited inhibitory action. These criteria of toxicity was more obvious as time lapsed between pesticidal treatment and pigment assessment, i.e., the holding period. Exposure of wheat plants, cultivated in both types of soil, to the two herbicides clodinafop - propargyl and bromoxynil and the insecticide malathion resulted in increase in the amounts of chlorophyll a, chlorophyll b and carotenoids during the whole experimental periods (4 days) with the exception of clodinafop - propargyl - treated plants which suffered from reduction in the level of the three pigments one day after treatment.
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