Submergence tolerance in Hordeum marinum: dissolved CO2 determines underwater photosynthesis and growth
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Submergence tolerance in Hordeum marinum : dissolved CO2 determines underwater photosynthesis and growth. / Pedersen, Ole; Malik, Al I.; Colmer, Timothy D.
In: Functional Plant Biology, Vol. 37, No. 6, 2010, p. 524-531.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Submergence tolerance in Hordeum marinum
T2 - dissolved CO2 determines underwater photosynthesis and growth
AU - Pedersen, Ole
AU - Malik, Al I.
AU - Colmer, Timothy D.
PY - 2010
Y1 - 2010
N2 - Floodwaters differ markedly in dissolved CO(2), yet the effects of CO(2) on submergence responses of terrestrial plants have rarely been examined. The influence of dissolved CO(2) on underwater photosynthesis and growth was evaluated for three accessions of the wetland plant Hordeum marinum Huds. All three accessions tolerated complete submergence, but only when in CO(2) enriched floodwater. Plants submerged for 7 days in water at air equilibrium (18 mM CO(2)) suffered loss of biomass, whereas those with 200 mM CO(2) continued to grow. Higher underwater net photosynthesis at 200 mM CO(2) increased by 2.7- to 3.2-fold sugar concentrations in roots of submerged plants, compared with at air equilibrium CO(2). Leaf gas films enhancing gas exchange with floodwater, lack of a shoot elongation response conserving tissue sugars and high tissue porosity (24-31% in roots) facilitating internal O(2) movement, would all contribute to submergence tolerance in H. marinum. The present study demonstrates that dissolved CO(2) levels can determine submergence tolerance of terrestrial plants. So, submergence experiments should be conducted with defined CO(2) concentrations and enrichment might be needed to simulate natural environments and, thus, provide relevant plant responses
AB - Floodwaters differ markedly in dissolved CO(2), yet the effects of CO(2) on submergence responses of terrestrial plants have rarely been examined. The influence of dissolved CO(2) on underwater photosynthesis and growth was evaluated for three accessions of the wetland plant Hordeum marinum Huds. All three accessions tolerated complete submergence, but only when in CO(2) enriched floodwater. Plants submerged for 7 days in water at air equilibrium (18 mM CO(2)) suffered loss of biomass, whereas those with 200 mM CO(2) continued to grow. Higher underwater net photosynthesis at 200 mM CO(2) increased by 2.7- to 3.2-fold sugar concentrations in roots of submerged plants, compared with at air equilibrium CO(2). Leaf gas films enhancing gas exchange with floodwater, lack of a shoot elongation response conserving tissue sugars and high tissue porosity (24-31% in roots) facilitating internal O(2) movement, would all contribute to submergence tolerance in H. marinum. The present study demonstrates that dissolved CO(2) levels can determine submergence tolerance of terrestrial plants. So, submergence experiments should be conducted with defined CO(2) concentrations and enrichment might be needed to simulate natural environments and, thus, provide relevant plant responses
KW - aerenchyma
KW - elevated CO(2)
KW - flooding tolerance
KW - sea barleygrass
KW - tissue porosity
KW - tissue sugars
KW - Triticeae
KW - waterlogging tolerance
KW - wetland plant
KW - wild Hordeum
KW - RADIAL OXYGEN LOSS
KW - INORGANIC CARBON
KW - ROOT AERATION
KW - WATER PLANTS
KW - RICE
KW - DYNAMICS
KW - O-2
KW - FLOODWATER
U2 - 10.1071/FP09298
DO - 10.1071/FP09298
M3 - Journal article
VL - 37
SP - 524
EP - 531
JO - Australian Journal of Plant Physiology
JF - Australian Journal of Plant Physiology
SN - 1445-4408
IS - 6
ER -
ID: 33980925