Abstract
IT has been reported1–3 that leaf from tobacco grown in a greenhouse contains no rutin and in general much less polyphenolic material than leaf from plants grown in the field, and it has been concluded that the filtering action of the greenhouse glass to ultra-violet irradiation is responsible for certain of these differences. However, Frey-Wyssling and Babler1 were able to show that when greenhouse plants were irradiated with ultra-violet light the chlorogenic acid content of the leaves was increased, but that rutin was still absent, which implies that the apparent absence of rutin is not due to limited ultra-violet irradiation.
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