THE INFLUENCE OF LIGHT ON THE GERMINATION OF SENECIO VULGARIS L.

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Summary

Achenes of Senecio vulgaris L. show a strong positive requirement for white or red light to attain maximal germination at 20 °C. The response to light is mediated by the photoreversible photoreceptor phytochrome. The light requirement can also be satisfied by short daily irradiations with red light (660 nm) and far-red light given at the end of daily red light photoperiods depresses germination to Cedeximately 60%. It is suggested that Pfr, the active form of photochrome, once formed, persists for between 8 and 10 h. The interactions between light, KNO3 and constant temperatures between 0 and 30 °C have also been studied.

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