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PHYTOCHROME‐MEDIATED LOSS OF POLYRIBOSOMES IN ETIOLATED MUSTARD HYPOCOTYLS
Author(s) -
Acton G. John
Publication year - 1978
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.1751-1097.1978.tb07719.x
Subject(s) - etiolation , hypocotyl , polysome , phytochrome , ribosome , biophysics , biology , cytoplasm , red light , biochemistry , chemistry , microbiology and biotechnology , botany , rna , enzyme , gene
. Continuous far‐red light operating through phytochrome reduces the rate of hypocotyl lengthening by a factor of 8. Consonant with this was a reduction of up to 12% in the proportion of total cytoplasmic ribosomes present as polysomes. A 2% reduction was elicited by brief red light. Evidence is presented which argues against these changes arising from a change in extractability or nucleolytic activity. The speed of the response (1.5 h) is much slower than that for inhibition of lengthening (15 min). The data therefore indicate that phytochrome is unlikely to act by controlling the general rate of translation in this instance.