Abstract
The variation of tobacco pollen lipids was studied during a germination time of four hr. During this time pollen grains went through a lag phase of 30 min after which pollen tube growth started. After four hr this growth had extended the area of the plasmamembrane by factors of five to 10. The major lipids were neutral lipids followed by phospholipids, whereas glycolipids represented only a minor fraction. The increase in membrane surface during pollen tube growth was not reflected by a similar increase in lipid content, which increased only slightly during the lag phase. Labelling with radioactive acetate showed a continuous incorporation of precursor into all lipid components from the beginning of germination, whereas labelling by radioactive phosphate commenced later. The data are discussed in terms of membrane assembly and turnover during pollen germination.
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