The germination of Potamogeton pectinatus tubers: environmental control by temperature and light

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Abstract
The effects of temperature and light intensity on Potamogeton pectinatus L. tuber germination were investigated in two laboratory experiments. The hypothesis tested was that the initation of biomass development in the stream is dependent on the temperature regulation of tuber germination. Overwintering tubers were used to eliminate the effects of preconditioning. Low temperature significantly inhibited germination and growth. In addition, germination and growth were significantly higher in the light than in the dark. However, light intensity in the experimental range had no significant effect n tuber germination or early growth.