Overexpression of Hybrid in Leads to Excessive Chlorophyll Synthesis and Improved Growth.

Chloroplasts is the site for photosynthesis, which is the main primary source of energy for plants. Golden2-like (GLK) is a key transcription factor that regulates chloroplast development and chlorophyll synthesis. However, most studies on genes are performed in crops and model plants with less attention to woody plants. In this study, we identified the and genes in the woody plant hybrid, and they are specifically expressed in green tissues. We showed that overexpression of the gene improves rosette leaf chlorophyll content and induces ectopic chlorophyll biogenesis in primary root and petal vascular tissue in . Although these exhibit a late-flowering phenotype, transgenic lines accumulate more biomass in vegetative growth with improved photochemical quenching (qP) and efficiency of photosystem II. Taken together, we verified a conserved and ancient mechanism for regulating chloroplast biogenesis in hybrid and evaluated its effect on photosynthesis and rosette biomass accumulation in the model plant .