Kinetics of intracellular redistribution of phytochrome in Avena coleoptiles after its photoconversion to the active, far-red-absorbing form.

Abstract:

:The kinetics of the intracellular redistribution of phytochrome (sequestering) in Avena sativa L. coleoptiles following a brief, saturating actinic pulse of red (R) light have been determined. Immunocytochemical labelling of phytochrome with monoclonal antibodies showed that at 22°C sequestering can occur within 1-2 s from the onset of R irradiation and is dependent upon the continued presence of the far-red-absorbing form of phytochrome (Pfr). The initial rate, but not the final extent, of sequestering is reduced by lowering the temperature of the tissue to 1°C. Sequestering at 22°C appears to involve two distinct stages: (1) a rapid association of Pfr with putative binding sites initiates the sequestered condition, following which (2) these sites of sequestered phytochrome appear to aggregate. Neither of these two processes was affected by the cytoskeletal inhibitors colchicine or cytochalasin B. Phytochrome sequestering therefore resembles R-light-induced phytochrome pelletability with respect to kinetics, temperature sensitivity, and dependence upon the continued presence of Pfr in the cell.

journal_name

Planta

journal_title

Planta

authors

McCurdy DW,Pratt LH

doi

10.1007/BF00391335

subject

Has Abstract

pub_date

1986-03-01 00:00:00

pages

330-6

issue

3

eissn

0032-0935

issn

1432-2048

journal_volume

167

pub_type

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