The photosynthetic response of C₃ and C₄ bioenergy grass species to fluctuating light

Abstract

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Increased bundle‐sheath leakiness of CO2 during photosynthetic induction shows a lack of coordination between the C4 and C3 cycles

“…Variation in carbon assimilation during fluctuating light was previously observed by Lee et al . ( 2022 ) across four NADP‐ME grass species and may well arise from variation in the degree to which the C 4 and C 3 cycles are coordinated, as was shown here for maize and sorghum, but was not determined in their study. Being able to estimate variation in ϕ between species and genotypes during fluctuating light will be necessary for developing strategies to improve C 4 crop performance.…”

“…This finding was challenged by Lee et al (2022) who compared carbon assimilation during fluctuating light to steady-state across six C 3 and six C 4 species. Whereas Kubásek et al (2013) made measurements during photosynthetic induction, Lee et al (2022) examined plants that were fully acclimated to high light and suggested that differences between the two studies could be a result of photosynthetic induction causing lower coordination between C 3 and C 4 cycles.…”

“…As rapid stomatal movement was reported in C 4 plants (Bellasio et al, 2017;Ozeki et al, 2022), the biomass reduction suggests that C 4 species may be more vulnerable to efficiency losses under fluctuating light, perhaps because of the need to coordinate between the two photosynthetic cycles. This finding was challenged by Lee et al (2022) who compared carbon assimilation during fluctuating light to steady-state across six C 3 and six C 4 species. Whereas Kubásek et al (2013) made measurements during photosynthetic induction, Lee et al (2022) examined plants that were fully acclimated to high light and suggested that differences between the two studies could be a result of photosynthetic induction causing lower coordination between C 3 and C 4 cycles.…”

“…This finding was challenged by Lee et al . ( 2022 ) who compared carbon assimilation during fluctuating light to steady‐state across six C 3 and six C 4 species. Whereas Kubásek et al .…”

“…( 2013 ) made measurements during photosynthetic induction, Lee et al . ( 2022 ) examined plants that were fully acclimated to high light and suggested that differences between the two studies could be a result of photosynthetic induction causing lower coordination between C 3 and C 4 cycles.…”