Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - High C3 photosynthetic capacity and high intrinsic water use efficiency underlies the high productivity of the bioenergy grass Arundo donax
AU - Webster, Richard J.
AU - Driever, Steven M.
AU - Kromdijk, Johannes
AU - McGrath, Justin
AU - Leakey, Andrew D. B.
AU - Siebke, Katharina
AU - Demetriades-Shah, Tanvir
AU - Bonnage, Steve
AU - Peloe, Tony
AU - Lawson, Tracy
AU - Long, Stephen P.
PY - 2016/2/10
Y1 - 2016/2/10
N2 - Arundo donax has attracted interest as a potential bioenergy crop due to a high apparent productivity. It uses C3 photosynthesis yet appears competitive with C4 grass biomass feedstock's and grows in warm conditions where C4 species might be expected to be that productive. Despite this there has been no systematic study of leaf photosynthetic properties. This study determines photosynthetic and photorespiratory parameters for leaves in a natural stand of A. donax growing in southern Portugal. We hypothesise that A. donax has a high photosynthetic potential in high and low light, stomatal limitation to be small and intrinsic water use efficiency unusually low. High photosynthetic rates in A. donax resulted from a high capacity for both maximum Rubisco (V-c,V- max 117 mu mol CO2 m(-2) s(-1)) and ribulose-1:5-bisphosphate limited carboxylation rate (J(max) 213 mu mol CO2 m(-2) s(-1)) under light-saturated conditions. Maximum quantum yield for light-limited CO2 assimilation was also high relative to other C3 species. Photorespiratory losses were similar to other C3 species under the conditions of measurement (25%), while stomatal limitation was high (0.25) resulting in a high intrinsic water use efficiency. Overall the photosynthetic capacity of A. donax is high compared to other C3 species, and comparable to C4 bioenergy grasses.
AB - Arundo donax has attracted interest as a potential bioenergy crop due to a high apparent productivity. It uses C3 photosynthesis yet appears competitive with C4 grass biomass feedstock's and grows in warm conditions where C4 species might be expected to be that productive. Despite this there has been no systematic study of leaf photosynthetic properties. This study determines photosynthetic and photorespiratory parameters for leaves in a natural stand of A. donax growing in southern Portugal. We hypothesise that A. donax has a high photosynthetic potential in high and low light, stomatal limitation to be small and intrinsic water use efficiency unusually low. High photosynthetic rates in A. donax resulted from a high capacity for both maximum Rubisco (V-c,V- max 117 mu mol CO2 m(-2) s(-1)) and ribulose-1:5-bisphosphate limited carboxylation rate (J(max) 213 mu mol CO2 m(-2) s(-1)) under light-saturated conditions. Maximum quantum yield for light-limited CO2 assimilation was also high relative to other C3 species. Photorespiratory losses were similar to other C3 species under the conditions of measurement (25%), while stomatal limitation was high (0.25) resulting in a high intrinsic water use efficiency. Overall the photosynthetic capacity of A. donax is high compared to other C3 species, and comparable to C4 bioenergy grasses.
KW - MISCANTHUS X GIGANTEUS
KW - CHLOROPHYLL FLUORESCENCE ANALYSIS
KW - TEMPERATURE RESPONSE FUNCTIONS
KW - GAS-EXCHANGE MEASUREMENTS
KW - GIANT REED
KW - IN-VIVO
KW - C-4 PHOTOSYNTHESIS
KW - CO2 ASSIMILATION
KW - LIMITED PHOTOSYNTHESIS
KW - QUANTUM YIELDS
U2 - 10.1038/srep20694
DO - 10.1038/srep20694
M3 - Journal article
VL - 6
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 20694
ER -