Abstract
Unequal absorption of photons between photosystems I and II, and between bundle-sheath and mesophyll cells, are likely to affect the efficiency of the CO2-concentrating mechanism in C4 plants. Under steady-state conditions, it is expected that the biochemical distribution of energy (ATP and NADPH) and photosynthetic metabolite concentrations will adjust to maintain the efficiency of C4 photosynthesis through the coordination of the C3 (Calvin-Benson-Bassham) and C4 (CO2 pump) cycles. However, under transient conditions, changes in light quality will likely alter the coordination of the C3 and C4 cycles, influencing rates of CO2 assimilation and decreasing the efficiency of the CO2-concentrating mechanism. To test these hypotheses, we measured leaf gas exchange, leaf discrimination, chlorophyll fluorescence, electrochromatic shift, photosynthetic metabolite pools, and chloroplast movement in maize (Zea mays) and Miscanthus × giganteus following transitional changes in light quality. In both species, the rate of net CO2 assimilation responded quickly to changes in light treatments, with lower rates of net CO2 assimilation under blue light compared with red, green, and blue light, red light, and green light. Under steady state, the efficiency of CO2-concentrating mechanisms was similar; however, transient changes affected the coordination of C3 and C4 cycles in M. giganteus but to a lesser extent in maize. The species differences in the ability to coordinate the activities of C3 and C4 cycles appear to be related to differences in the response of cyclic electron flux around photosystem I and potentially chloroplast rearrangement in response to changes in light quality.
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Claims 7
Claim · model-written summary
Maize net CO2 assimilation responded quickly to light changes.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both species, the rate of net CO2 assimilation responded quickly to changes in light treatments”
t0“Maize”
Claim · model-written summary
Miscanthus net CO2 assimilation responded quickly to light changes.
- Taxon
- Miscanthus × giganteus
Miscanthus ×giganteust0 - Outcome
- rate of net CO2 assimilatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both species, the rate of net CO2 assimilation responded quickly to changes in light treatments”
t0“Miscanthus×giganteus”
Claim · model-written summary
Maize assimilation was lower under blue light than other stated light treatments.
- Treatment
- blue lighte0
- Outcome
- rates of net CO2 assimilatione0
- Direction
- lowere0
- Comparator
- red, green, and blue light, red light, and green lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with lower rates of net CO2 assimilation under blue light compared with red, green, and blue light, red light, and green light”
t0“Maize”
Claim · model-written summary
Miscanthus assimilation was lower under blue light than other stated light treatments.
- Taxon
- Miscanthus × giganteusMiscanthus ×giganteust0
- Treatment
- blue lighte0
- Outcome
- rates of net CO2 assimilatione0
- Direction
- lowere0
- Comparator
- red, green, and blue light, red light, and green lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with lower rates of net CO2 assimilation under blue light compared with red, green, and blue light, red light, and green light”
t0“Miscanthus×giganteus”
Claim · model-written summary
Under steady state the species had similar CO2 concentrating efficiency.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under steady state, the efficiency of CO2-concentrating mechanisms was similar”
t0“Maize”
Claim · model-written summary
Transient changes affected C3 and C4 cycle coordination more in Miscanthus than maize.
- Taxon
- M. giganteusMiscanthus ×giganteuse0
- Outcome
- coordination of C3 and C4 cyclese0
- Direction
- affectede0
- Comparator
- maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transient changes affected the coordination of C3 and C4 cycles in M. giganteus but to a lesser extent in maize”
Claim · model-written summary
Species differences in cycle coordination appear related to cyclic electron flux responses and potentially chloroplast rearrangement.
- Outcome
- ability to coordinate the activities of C3 and C4 cyclese0
- Qualifier
- differences in the response of cyclic electron flux around photosystem I and potentially chloroplast rearrangemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The species differences in the ability to coordinate the activities of C3 and C4 cycles appear to be related to differences in the response of cyclic electron flux around photosystem I and potentially chloroplast rearrangement in response to changes in light quality.”
t0“Maize”
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