Über den Einfluß des Phytochroms auf den Gehalt an Ribonucleinsäure und Protein in Senfkeimlingen (Sinapis alba L.)

Abstract

Photomorphogenesis, i. e. the control of plant growth and development by light independent of photosynthesis, is mediated mainly through phytochrome ¹. Recently the hypothesis has been advanced that P₇₃₀, the active phytochrome, acts through differential gene activation ². — The results presented in this paper support this view. It has been shown that synthesis of RNA and protein in the mustard seedling (Sinapis alba L.) are controlled by phytochrome. The photochemical formation of P₇₃₀ by red light leads to a strong increase in RNA and protein contents in the seedling. The influence of red can be reversed by an immediate subsequent irradiation with far-red light. This reversibility clearly indicates that phytochrome is involved.