Phytochrome regulation of pea phototropin.
Type 1 phototropin, one of the blue light receptors responsible for phototropism, is encoded in peas by at least two genes, PsPHOT1A and PsPHOT1B (formerly PsPK4 and PsPK5), both of which are more similar to Arabidopsis PHOT1 than to Arabidopsis PHOT2. We show here that PsPHOT1B encodes a full-length phototropin, whose expression pattern suggests that Psphot1b is the predominant phot1-type phototropin in etiolated seedlings. The gene encoding the other type 1 phototropin, PsPHOT1A, is expressed at low levels, with its highest levels in the leaves and stems of more mature, light-grown plants. Studies with phyA, phyB and the phyAphyB double mutants show that phyA and phyB have partially redundant roles in the reduction of PsPHOT1B expression under red light.
Elliott
Robert C
RC
School of Plant Science, University of Tasmania, Private Bag 55, Hobart, Tasmania 7001, Australia. Robert.Elliott@utas.edu.au
Platten
J Damien
JD
Watson
John C
JC
Reid
James B
JB
D029681:Arabidopsis Proteins; D001483:Base Sequence; D056931:Cryptochromes; D018744:DNA, Plant / Q000235:genetics; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D017343:Genes, Plant; D008027:Light; D008954:Models, Biological; D009154:Mutation; D018532:Pisum sativum / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D010786:Photoreceptor Cells; D017956:Photoreceptor Cells, Invertebrate; D018524:Phototropism / Q000235:genetics / Q000502:physiology; D010802:Phylogeny; D010834:Phytochrome / Q000235:genetics / Q000378:metabolism*; D051942:Phytochrome A; D051939:Phytochrome B; D043562:Receptors, G-Protein-Coupled; D014157:Transcription Factors
D029681:Arabidopsis Proteins; D056931:Cryptochromes; D018744:DNA, Plant; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins; C497973:PHYA protein, Arabidopsis; D051942:Phytochrome A; D043562:Receptors, G-Protein-Coupled; D014157:Transcription Factors; C119828:cry protein, Drosophila; D010834:Phytochrome; D051939:Phytochrome B