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Biomass partitioning is one of the pivotal determinants of crop growth management, which is influenced by environmental cues. Light and CO 2  are the main drivers of photosynthesis and biomass production in plants. In this study, the effects of CO 2  levels: ambient 400 ppm (a[CO 2 ]) and elevated to 1,000 ppm (e[CO 2 ]) and different light intensities (75, 150, 300, 600 μmol·m −2 ·s −1  photosynthetic photon flux density – PPFD) were studied on the growth, yield, and biomass partitioning in chrysanthemum plants. The plants grown at higher light intensity had a higher dry weight (DW) of both the vegetative and floral organs. e[CO 2 ] diminished the stimulating effect of more intensive light on the DW of vegetative organs, although it positively influenced inflorescence DW. The flowering time in plants grown at e[CO 2 ] and light intensity of 600 μmol·m −2 ·s −1  occurred earlier than that of plants grown at a[CO 2 ]. An increase in light intensity induced the allocation of biomass to inflorescence and e[CO 2 ] enhanced the increasing effect of light on the partitioning of biomass toward the inflorescence. In both CO 2  concentrations, the highest specific leaf area (SLA) was detected under the lowest light intensity, especially in plants grown at e[CO 2 ]. In conclusion, elevated light intensity and CO 2  direct the biomass toward inflorescence in chrysanthemum plants.

Interaction of Light Intensity and CO2 Concentration Alters Biomass Partitioning in Chrysanthemum

Interaction of Light Intensity and CO₂ Concentration Alters Biomass Partitioning in Chrysanthemum