Effects of Iron Deficiency on Chloroplast Lipids

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Abstract
The lipids of plastids from three different nodes of Hubbard squash plants were investigated. A comparison was made of the plastid lipids of plants grown on a complete nutrien with the plastid lipids of plants grown on an iron-deficient nutrient solution. The iron-deficient leaves were not chlorotic at the time of harvest. The separated lipids were quantitated by determining phosphorus, sugar, and fatty acid content. Plastids from older leaves contained more lipid phosphorus per lipid sugar than plastids from younger leaves. The plastids treated with an iron-deficient nutrient seemed to have relatively less glycerylphosphoryl glycerol-lipids than did the complete plastids. However, few major differences in the fatty acid composition existed between the iron-deficient and complete grown plastids. It was concluded that the rate of turnover of the plastid lipids may depend upon the individual species and the environment to which the plants are subjected. Further changes in the plastid lipids of the iron-dificient plants, as opposed to complete nutrient treated, occurred prior to the appearance of marked visible symptoms of chlorosis.

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