COP1,PPS,OsCOP1

| Categories genes  | Tags flower  reproductive  panicle  inflorescence  vegetative  ga  growth  leaf  meristem  flowering time  development  seed  endosperm  flavonoid  pericarp 
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  • Key message
    • In spite of its prolonged juvenile phase, the pps-1 mutant flowers early, and this is associated with derepression of RAP1B expression in pps-1 plants independently of the Hd1-Hd3a/RFT1 photoperiodic pathway
    • Its ability to regulate the vegetative phase change and the time of flowering suggests that rice PPS acquired novel functions during the evolution of rice/monocots
    • The COP1 ortholog PPS regulates the juvenile-adult and vegetative-reproductive phase changes in rice
    • Although the early vegetative phase and flowering time of pps-1 have been closely examined, the phenotypes in the late vegetative and reproductive phases are not yet well understood
    • Role of rice PPS in late vegetative and reproductive growth
    • Moreover, pps-1 had a small inflorescence meristem and small panicles
    • These phenotypes indicate that in pps-1 the juvenile phase coexists with the late vegetative phase, resulting in small panicles
    • Double mutant (d18-k pps-1) showed the same phenotype as the pps-1, indicating that PPS is upstream of GA biosynthetic genes
    • In the ninth leaf blade of pps-1, the relative length of the midrib was comparable to the sixth leaf blade of wild-type
    • The pps-1 mutant exhibits delayed expression of miR156 and miR172 and the suppression of GA biosynthetic genes, reducing the GA(3) content in this mutant
    • The rice peter pan syndrome-1 (pps-1) mutant shows a prolonged juvenile phase and early flowering
    • OsCOP1 regulates embryo development and flavonoid biosynthesis in rice (Oryza sativa L.)
    • These results demonstrate that OsCOP1 is associated with embryo development and flavonoid biosynthesis in rice grains
    • Novel mutations of OsCOP1 were identified to be responsible for yellowish pericarp and embryo lethal phenotype, which revealed that OsCOP1 plays a crucial role in flavonoid biosynthesis and embryogenesis in rice seed
    • CRISPR/Cas9-targeted mutagenesis was used to knock out OsCOP1 by targeting its functional domains, and transgenic seed displayed the yel mutant phenotype
    • Overexpression of OsCOP1 in a homozygous yel-hc mutant background restored pericarp color, and the aberrant flavonoid accumulation observed in yel-hc mutant was significantly reduced in the embryo and endosperm
    • This study will facilitate a better understanding of the functional roles of OsCOP1 involved in early embryogenesis and flavonoid biosynthesis in rice seeds
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