The Effect of Temperature on Photosynthesis of Ryegrass and White Clover Leaves

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Abstract
The rate of photosynthesis of leaves of perennial ryegrass (Lolium perenne L.) and white clover (Trifollum pratense L.) grown at different temperatures was measured at a range of temperatures. There was a small effect of the temperature at which a leaf had grown on its photosynthetic rate, but a large effect of measurement temperature, especially in bright light, where photosynthetic rates at 15°C were about twice those at 5°C. It appears that temperature could affect sward photosynthesis in the field. Ryegrass and clover had similar photosynthetic rates which responded similarly to temperature.