KINETIC STUDIES TO INTERPRET ‘HIGH‐ENERGY PHENOMENA’ OF PHOTOMORPHOGENESISL ON THE BASIS OF PHYTOCHROME

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Abstract
Abstract— Kinetic studies with the mustard seedling (Sinapis alba L.) support the hypothesis that the so‐called ‘high energy reaction’ of photomorphogenesis can be understood solely on the basis of phytochrome. Light‐induced anthocyanin synthesis (a typical ‘positive’ photoresponse(1) and light dependent inhibition of hypocotyl lengthening (a typical ‘negative’ photoresponse(1)) have been investigated. In order to explain the experimental data we have to assume that there are two different types of phytochrome 730 which differ greatly as far as their resistance to irreversible destruction is concerned. The existence of these two different types of phytochrome 730 has already been postulated on the basis of spectrophotometric measurements in vivo.(2)