Arabidopsis cpSRP54 regulates carotenoid accumulation in Arabidopsis and Brassica napus.
An Arabidopsis thaliana mutant, cbd (carotenoid biosynthesis deficient), was recovered from a mutant population based on its yellow cotyledons, yellow-first true leaves, and stunted growth. Seven-day-old seedlings and mature seeds of this mutant had lower chlorophyll and total carotenoids than the wild type (WT). Genetic and molecular characterization revealed that cbd was a recessive mutant caused by a T-DNA insertion in the gene cpSRP54 encoding the 54 kDa subunit of the chloroplast signal recognition particle. Transcript levels of most of the main carotenoid biosynthetic genes in cbd were unchanged relative to WT, but expression increased in carotenoid and abscisic acid catabolic genes. The chloroplasts of cbd also had developmental defects that contributed to decreased carotenoid and chlorophyll contents. Transcription of AtGLK1 (Golden 2-like 1), AtGLK2, and GUN4 appeared to be disrupted in the cbd mutant suggesting that the plastid-to-nucleus retrograde signal may be affected, regulating the changes in chloroplast functional and developmental states and carotenoid content flux. Transformation of A. thaliana and Brassica napus with a gDNA encoding the Arabidopsis cpSRP54 showed the utility of this gene in enhancing levels of seed carotenoids without affecting growth or seed yield.
Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, S7N 0X2, Canada.
Bianyun
B
Yu
Margaret Y
MY
Gruber
George G
GG
Khachatourians
Rong
R
Zhou
Delwin J
DJ
Epp
Dwayne D
DD
Hegedus
Isobel A P
IA
Parkin
Ralf
R
Welsch
Abdelali
A
Hannoufa
D000040:Abscisic Acid / Q000378:metabolism; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism* / Q000648:ultrastructure; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D029688:Brassica napus / Q000235:genetics* / Q000378:metabolism* / Q000648:ultrastructure; D002338:Carotenoids / Q000096:biosynthesis* / Q000235:genetics; D002734:Chlorophyll / Q000378:metabolism; D060365:Chloroplast Proteins / Q000235:genetics* / Q000378:metabolism; D002736:Chloroplasts / Q000648:ultrastructure; D061125:Genes, Chloroplast; D046529:Microscopy, Electron, Transmission; D009154:Mutation; D060888:Real-Time Polymerase Chain Reaction; D018271:Signal Recognition Particle / Q000235:genetics* / Q000378:metabolism
D029681:Arabidopsis Proteins; D060365:Chloroplast Proteins; C083707:FFC protein, Arabidopsis; D018271:Signal Recognition Particle; D002734:Chlorophyll; D002338:Carotenoids; D000040:Abscisic Acid