Abstract
Then phytoalexin, glyceollin, and the percentage of thymine in dimer form increased concomitantly in soybean suspension cultures irradiated (254 nm) at fluences ranging from 2 to 8 × 10 2 Jm −2. Both were measured after 48 hr of darkness following irradiation. A maximum of 836 μg glyceollin/g dry wt was produced in cells receiving 8 × 10 2 Jm −2 ; 1.2% total thymine was in the dimer form. Monomerization of thymine dimers and decrease in glyceollin concentration did not occur in the dark. Percentages of thymine in dimer form and glyceollin concentration decreased, however, with increasing fluences of photoreversal (360 nm) light.
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