Premium
RAPID TRANSMISSION OF A PHYTOCHROME SIGNAL FROM HYPOCOTYL HOOK TO COTYLEDONS IN MUSTARD (Sinapis alba L.)
Author(s) -
OELZEKAROW HEIDEMARIE,
MOHR Hans
Publication year - 1988
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1988.tb02749.x
Subject(s) - sinapis , hypocotyl , phytochrome , cotyledon , botany , hook , biology , signal (programming language) , brassica , red light , programming language , structural engineering , computer science , engineering
— In mustard ( Sinapis alba L.) cotyledons appearance of ‘potential capacity’ to phosphorylate is controlled by phytochrome (P fr ) through a threshold, all‐or‐none reaction. Phytochrome operates only if the hypocotyl hook is connected to the cotyledons for at least 2.5 min after the end of a 1 min inductive light pulse. Partial irradiations of hook and cotyledons show that in the case of induction of ‘potential capacity’ rapid transmission of the P fr signal occurs from the hypocotyl hook to the cotyledons. Phytochrome within the cotyledons is totally ineffective in this regard. A 3 min red light pulse suffices for full transmission of the signal. It seems that an explanation of the facts we have observed requires a revision of the present views about communication between the organs of a plant.