<I>Coriaria angustissima</I>

Carbon and nitrogen fixation in rhizomatous species of Coriaria

The rhizomatous species Coriaria sarmentosa and C. angustissima bear coralloid clusters of root nodules which actively fix atmospheric nitrogen. Using rooted cuttings, comparative measurements were made of growth, net photosynthesis, dark respiration and nitrogen fixation in the two species. In both, the optimum temperatures for growth and net photosynthesis are 16-18¡C. Over a range of temperature and light intensity C. sarmentosa possesses a higher rate of net photosynthesis than its more diminuitive sister species C. angustissima.