Effect of Substituted Pyridazinones on Chloroplast Structure and Lipid Metabolism in Greening Barley Leaves

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Abstract
The effect of the substituted pyridazinone herbicides, Sandoz 9785 and Sandoz 6706, on lipid metabolism was studied in greening barley leaves. The herbicides had no effect on chlorophyll formation but caused an altered chloroplast morphology during greening. In leaves supplied with {14C} acetate, Sandoz 9785 decreased incorporation of radioactivity into linolenate while Sandoz 6706 decreased incorporation into both linolenate and trans-Δ3-hexadecenoate. Decreased linolenate labelling was accompanied by an accumulation of {14C}linolenate in diacylgalactosylglycerol. {14C}Palmitate accumulated in phosphatidylglycerol when synthesis of trans-Δ3-hexadecenoate was inhibited. The results are discussed in relation to the function of acyl lipids in fatty acid desaturation and the role of lipids in chloroplast morphology.

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