Abstract
Abstract— Mature Sinapis alba L. and Impatiens parviflora DC. were treated with the herbicide norfiuorazon prior to development of the third or second leaf, respectively. This treatment yielded a partially bleached plant capable of normal growth and development. The bleached leaves were used for spectrophotometric phytochrome assay. In mature plants an almost constant level of phytochrome is maintained under continuous white light. The dark kinetics and the response of the phytochrome system to light of various qualities provide further evidence of the stable character of the phytochrome system.
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