Abstract
Summary Young plants of Lactuca sativa L. and Rumex alpinus L. grown in assimilation cuvettes show different development of photosynthetic capacity depending on whether they are made from material allowing (Quartz) or not allowing (Plexiglass) transmission of U.V. light. For Rumex alpinus this was the case in experiments both with natural and artificial light sources where as for Lactuca sativa it was only the case when the light source had a relatively high U.V. value, i. e. Mercurylamps (Osram H qil and Osram Vitalux). These results show that with cuvettes made from non U. V. transparent material results from measurement of photosynthesis may be incorrect, an indeed depending on species and U.V. intensity may be positively or negatively influenced. Normalglass and U.V.-transparent Plexiglass are for various reasons not suitable as substitues for Quartz.
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