Physiological Studies of the Sulpholipids of Diatoms

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Abstract
The sulpholipids of three species of freshwater and marine diatom Nitzschia palae Kutz, Navicula muralis Lewin and Navicula incerta Grün, have been investigated under various culture conditions. The plant sulpholipid, sulphoquinovosyl diglyceride, was predominantly synthesized in the light rather than in the dark while the unknown sulpholipids, designated as U1 and U2, were produced more in the dark than in the light. It was found that cells starved of carbon or sulphate utilized their sulpholipid reserve as sources of these materials. Generally, cultures incubated in the light and bubbled with air (with or without CO2) showed a high level of incorporation of 36S into sulpholipids. In cultures bubbled with oxygen-free nitrogen the incorporation of tracer was very small. The photosynthetic and respiratory inhibitors, DCMU and DNP appreciably reduced the amount of tracer incorporated into the sulpholipids.

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