Affinity for CO2 in relation to the ability of freshwater macrophytes to use HCO3-
Affinity for CO2 in relation to the ability of freshwater macrophytes to use HCO3-
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DOI：
10.1046/j.1365-2435.1998.00172.x
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发表时间：
1998-02-01
影响因子：
5.2
通讯作者：
Madsen, TV
中科院分区：
文献类型：
--
作者：
Maberly, SC;Madsen, TV
1. The affinity of photosynthesis for CO2 is calculated here as the initial slope of net-photosynthetic rate against concentration of CO2. The affinity for CO2 for pairs of freshwater macrophytes with similar leaf morphology but able or unable to use HCO3- as a carbon source was compared.2. Species restricted to CO2 had a higher affinity for CO2 than species that were also able to use HCO3- when rates were expressed on the basis of area, dry mass and content of chlorophyll a.3. Published values for the affinity for CO2 and the concentration of CO2 which half-saturated rate of photosynthesis were compiled and compared. Despite a large range of values, affinity for CO2 was greater for species restricted to CO2 than for those also able to use HCO3- and statistically different when the slope was expressed on the basis of dry mass and chlorophyll a content.4. The difference in affinity is consistent with predicted benefits of a high permeability to CO2 for species relying on passive diffusion of CO2 and a lower permeability for species able to use HCO3- in order to reduce efflux of CO2 from a high internal concentration generated by active transport.5. The implications of the different affinities are discussed in terms of species distribution.
