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

Abstract

Biomass partitioning is one of the pivotal determinants of crop growth management, which is influenced by environmental cues. Light and CO2 are the main drivers of photosynthesis and biomass production in plants. In this study, the effects of CO2 levels: ambient 400 ppm (a[CO2]) and elevated to 1,000 ppm (e[CO2]) 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[CO2] 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[CO2] and light intensity of 600 μmol·m−2·s−1 occurred earlier than that of plants grown at a[CO2]. An increase in light intensity induced the allocation of biomass to inflorescence and e[CO2] enhanced the increasing effect of light on the partitioning of biomass toward the inflorescence. In both CO2 concentrations, the highest specific leaf area (SLA) was detected under the lowest light intensity, especially in plants grown at e[CO2]. In conclusion, elevated light intensity and CO2 direct the biomass toward inflorescence in chrysanthemum plants.

Elevated light intensity compensates for nitrogen deficiency during chrysanthemum growth by improving water and nitrogen use efficiency

“…This circumstance elaborates on the underlying mechanism through which PPFD compensated for N uptake under N constraint. Concurred with our results, the positive effect of PPFD on root biomass reported on lettuce 14 and chrysanthemum 41 . Regardless of PPFD, increase in N concentration reduced the partitioning of biomass to flowers.…”

“…We observed that the adverse effects of nitrogen deficiency extended to the reproductive growth stage and eventually prolonged the flower emergence period and decreased the biomass partitioning to the flower under low PPFD The positive role of PPFD on the flower emergence period and the increasing number of flowers have been also declared in the previous study on chrysanthemum 41 . In addition, a strong genetic correlation between flowering date and NUE has been reported in wheat 42 .…”

Plants exposed to titanium dioxide nanoparticles acquired contrasting photosynthetic and morphological strategies depending on the growing light intensity: a case study in radish

“…Therefore, the optimum growth light intensity for light use efficiency was clearly the 300 µmol m −2 s −1 PPFD. In lettuce, the optimum growth light intensity was 600 µmol m −2 s −1 PPFD 16,17,[41][42][43][44] , while for Aloe vera L. it was 50% of sunlight as compared to 75 or 100% 44 . F v /F m was generally not affected by TiO 2 nanoparticle spray, except for an increase noted at 75 µmol m −2 s −1 PPFD.…”

Growth, Biomass Partitioning, and Photosynthetic Performance of Chrysanthemum Cuttings in Response to Different Light Spectra

“…Light quality can potentially change the allocation of biomass toward the aboveground or underground parts of the plant [ 28 , 29 ]. In the present study, B and R lights caused a contrasting pattern of biomass partitioning into the above- or under-ground parts of the chrysanthemum rooted cuttings.…”