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Articles

Plastid Differentiation, Acyl Lipid, and Fatty Acid Changes in Developing Green Maize Leaves ¹

^a Department of Biology, University of York, Heslington, York Y01 5DD, England

Plastid differentiation, acyl lipid, and fatty acid composition have been followed in successive 2-cm sections from the base (youngest tissue) to the tip (oldest tissue) of green Zea mays (maize) leaves grown under a normal diurnal light regime. Although the youngest cells (0-4 cm from the leaf base) had only proplastids with one or two grana, they contained chlorophylls a and b, monogalactosyldiglyceride, digalactosyldiglyceride, sulfolipid, phosphatidylcholine, phosphatidylethanolamine, and phosphatidylglycerol. In the more mature sections, the plastids increased in size 5-fold, and differentiation into mesophyll and bundle-shealth chloroplasts had occurred. Concomitantly, the levels of all the lipids increased with the exception of phosphatidylcholine and phosphatidylethanolamine which decreased. With increasing cell maturity, the percentage of linolenic acid increased in all the individual acyl lipids, but palmitic acid remained constant in phosphatidylcholine, phosphatidylethanolamine, and sulfolipid. The ^3t-hexadecenoic acid was only detectable in the phosphatidylglycerol of the most mature maize tissue.

¹ This work was supported by a grant from the Science Research Council to R.M.L. and M.G.R. and by Grant GB8199 from the National Science Foundation to W.W.T.

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