Phosphate fertilizers increase CO₂ assimilation and yield of soybean in a shaded environment

Abstract

Abbreviations: AQY -apparent quantum yield; Chl -chlorophyll; Ci -intercellular CO2 concentration; FBPA -fructose-1,6-bisphosphate aldolase; Fv/Fm -maximum quantum yield of PSII primary photochemistry; I -light intensity; Ic -light-compensation point; Isat -light-saturation point; Jmax -maximum electron transport rate; OJIP -Chl a fluorescence transient curve; PIABS -performance index on an absorption basis; PN -net photosynthetic rate; PNmax -light-saturated net photosynthetic rate; PN-Ci -net photosynthetic rate-intercellular CO2 concentration curve; PN-I -net photosynthetic rate-light intensity curve; R1 -beginning of flowering; R3 -beginning of the pod stage; R5 -beginning of seeding; RD -dark respiration rate; RuBP -ribulose-1,5-bisphosphate; SBPasesedoheptulose-1,7-bisphosphatase; Vcmax -maximum ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) carboxylation rate; Vj -relative variable fluorescence at 2 ms; Wk -relative variable fluorescence at 300 μs; φEo -quantum yield of electron transport; ψo -probability that a trapped exciton moves an electron into the electron transport chain beyond QA -.