Summary
In an earlier paper (Mohr 1957) it was described that the formation of anthocyanin and the inhibition of lengthening of the hypocotyl of dark grown seedlings (Sinapis alba) is governed by the action of two photomorphogenic action systems. The one system is the well known “reversible red far-red reaction system” (low energy reaction), the other one is a high energy reaction system which can be called — in reference to the action peaks in the far-red and in the blue — “blue far-red reaction system”. The chemical nature of the absorbing pigments is still unknown.
In the present paper another photomorphogenic response of the young dark grown seedlings ofSinapis alba, the light dependent formation of unicellular hairs from epidermal cells of the hypocotyl, has been investigated. It has been shown that this response is also governed by these two reaction systems. These systems have been physiologically separated. Experiments have been presented which evaluate the importance of the assumption that the red absorbing pigment of the reversible red far-red pigment system is reformed from a precursor when the pigment present before irradiation is transformed into the far-red absorbing pigment by an irradiation with red.
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Mohr, H. Der Lichteinfluss auf die Haarbildung am Hypokotyl vonSinapis alba L.. Planta 53, 109–124 (1959). https://doi.org/10.1007/BF03028467
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DOI: https://doi.org/10.1007/BF03028467