New insight into photosynthetic acclimation to elevated CO2: the role of leaf nitrogen and ribulose-1,5-bisphosphate carboxylase/oxygenase content in rice leaves
Article
Article Title | New insight into photosynthetic acclimation to elevated CO2: the role of leaf nitrogen and ribulose-1,5-bisphosphate carboxylase/oxygenase content in rice leaves |
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ERA Journal ID | 2585 |
Article Category | Article |
Authors | Seneweera, Saman (Author), Makino, Amane (Author), Hirotsu, Naoki (Author), Norton, Robert (Author) and Suzuki, Yuji (Author) |
Journal Title | Environmental and Experimental Botany |
Journal Citation | 71 (2), pp. 128-136 |
Number of Pages | 9 |
Year | 2011 |
Place of Publication | Amsterdam, Netherlands |
ISSN | 0098-8472 |
1873-7307 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.envexpbot.2010.11.002 |
Web Address (URL) | http://www.sciencedirect.com/science/article/pii/S0098847210002273# |
Abstract | We tested the hypothesis that photosynthetic (A) acclimation to elevated CO2 partial pressure (p[CO2]) is associated with the inhibition of protein synthesis, inhibition of nitrogen (N) partitioning into the leaf blade and/or accelerated leaf senescence in rice (Oryza sativa L. cv. Notohikari). Plants were grown for 70 days hydroponically in artificially illuminated growth chambers at a p[CO2] of either 39 or 100Pa at N 2mM. Leaf A, Vc.max, Jmax, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, E.C.4.1.1.39), mRNA for associated genes rbcS and rbcL, total N and carbohydrate concentrations in leaves at different positions in the canopy were measured. Spatial allocation of N and Rubisco synthesis of expanding leaf blade was also measured from the leaf ligule to tip of the leaf blade. Growth at elevated p[CO2] suppressed light saturated A, Vc.max and Jmax in leaf blades at all positions in the canopy. The suppression of A was 15% for the upper leaf blades compared to 37% in the lower leaf blades. Similar reductions in the amount of Rubisco, Chlorophyll, and total N were observed in the leaves of the plants grown in 100 p[CO2] compared to the 39 p[CO2]. Sucrose and starch concentration concentrations increased at elevated p[CO2] but we found no relationship between A, Rubisco or the amount of transcript abundance of rbcS and rbcL. Elevated p[CO2] substantially reduced N allocation into expanding leaf blades and this was well correlated with Rubisco synthesis. These results suggest that A acclimation to elevated p[CO2] occurs during all phases of the leaf development, is initiated during the cell maturation process and linked with spatial N allocation into the leaf blade. In addition, elevated p[CO2] accelerated lower leaf blade senescence which compounded the effect on A acclimation. |
Keywords | carbohydrates; elevated p[CO2]; nitrogen; photosynthesis; photosynthetic acclimation; Ribulose-1,5-bisphosphate carboxylase/oxygenase; rice; Oryza sativa L. cv. Notohikari |
ANZSRC Field of Research 2020 | 300103. Agricultural molecular engineering of nucleic acids and proteins |
310805. Plant pathology | |
340503. Organic chemical synthesis | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Melbourne |
Tohoku University, Japan | |
Toyo University, Japan | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2739/new-insight-into-photosynthetic-acclimation-to-elevated-co2-the-role-of-leaf-nitrogen-and-ribulose-1-5-bisphosphate-carboxylase-oxygenase-content-in-rice-leaves
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