Spectral (IR) and thermogravimetrical properties of surface lipids of two coniferous species, differing during molecular weights of their components, were investigated in the process of ontogenic development. Different mechanisms of surface lipid formation in leaves of the investigated species are shown. It is supposed that low temperature endothermic effect, which is connected with phase transfer of the surface lipids amorphous part may play functional role in formation of stability of plants to gases.
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