**Abbreviations**

CAB-13: type III light harvesting chlorophyll a/b binding protein 13; CL: Continuous lighting; DIT: Days into the treatment; DLI: Daily light integral; Fo: Minimum fluorescence in a dark-adapted state; Fm: Maximum fluorescence in a dark-adapted state; Fv: Variable fluorescence in a dark-adapted state; Fv/Fm: Maximum quantum efficiency of PSII; Jmax: Maximum rate of electron transport; LCP: Light compensation point; LED: Light-emitting diode; LUE: Light use efficiency; N: Photon flux; NCER: Net carbon exchange rate; PHY A: Phytochrome A; Pnmax: Photosynthetic maximum; PPE: Photosynthetic photon efficacy; PSI: Photosystem I; PSII: Photosystem II; PSS: Phytochrome photostationary state; QY; Quantum yield; R:Fr: Red to far-red ratio; TE: 'Trovanzo' grafted onto 'Emperator'; TK: 'Trovanzo' grafted onto 'Kaiser'; Vcmax: Maximum rate of Rubisco carboxylation; WUE: Water use efficiency; σr: Photochemical cross-section of phytochrome in the red absorbing state; σFr: Photochemical cross-section of phytochrome in the red absorbing state.
