Polygonum sachalinense alters the balance between capacities of regeneration and carboxylation of ribulose‐1,5‐bisphosphate in response to growth CO₂ increment but not the nitrogen allocation within the photosynthetic apparatus

Abstract

The limiting step of photosynthesis changes depending on CO(2) concentration and, in theory, photosynthetic nitrogen use efficiency at a respective CO(2) concentration is maximized if nitrogen is redistributed from non-limiting to limiting processes. It has been shown that some plants increase the capacity of ribulose-1,5-bisphoshate (RuBP) regeneration (evaluated as J(max) ) relative to the RuBP carboxylation capacity (evaluated as V(cmax) ) at elevated CO(2) , which is in accord with the theory. However, there is no study that tests whether this change is accompanied by redistribution of nitrogen in the photosynthetic apparatus. We raised a perennial plant, Polygonum sachalinense, at two nutrient availabilities under two CO(2) concentrations. The J(max) to V(cmax) ratio significantly changed with CO(2) increment but the nitrogen allocation among the photosynthetic apparatus did not respond to growth CO(2) . Enzymes involved in RuBP regeneration might be more activated at elevated CO(2) , leading to the higher J(max) to V(cmax) ratio. Our result suggests that nitrogen partitioning is not responsive to elevated CO(2) even in species that alters the balance between RuBP regeneration and carboxylation. Nitrogen partitioning seems to be conservative against changes in growth CO(2) concentration.

Sustained Photosynthetic Performance of Coffea spp. under Long-Term Enhanced [CO2]

“…These parallel increases were likely associated with the maintenance of a close functional balance between carboxylation and electron transport events (J max /V cmax ), which seemed to be conserved among coffee genotypes and irrespective of growth [CO 2 ] (Table 2). Similar results have been reported for some acacia species [17,60] and also in other plant species, where the unchanging J max /V cmax ratio has been interpreted as reflecting an absence of resource redistribution among photosynthetic components [61]. Additionally, the reinforcement of photosynthetic components under high [CO 2 ] was also unrelated to changes in photochemical efficiency as analyzed by Chl a fluorescence.…”

Exploring the optimum nitrogen partitioning to predict the acclimation of C3 leaf photosynthesis to varying growth conditions

“…However, experimental data do not always support this prediction (e.g. Akita et al , 2012). Furthermore, our model also showed that the increase in the J max25 : V c,max25 ratio in response to the elevated CO 2 became smaller at a lower temperature (results not shown), suggesting a strong interaction between CO 2 and temperature.…”

Effects of soil nitrogen (N) deficiency on photosynthetic N-use efficiency in N-fixing and non-N-fixing tree seedlings in subtropical China

“…A lower soil N content could result in smaller chloroplasts 31 , leading to a decreased chloroplast surface area facing the intercellular air spaces 32 and an increased distance between the intercellular space and the catalytic site of Rubisco 12 . Adding N to the soil could improve the leaf N content in the Rubisco, bioenergetics, and light-harvesting components 7,33–35 , but the changes in the proportion of N in these components were unclear 1,11 .…”