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Mechanistic interpretation of carbon isotope discrimination by marine macroalgae and seagrasses.
- J. Raven, A. M. Johnston, +9 authors K. Dunton
- Biology, Medicine
- Functional plant biology : FPB
- 1 April 2002
The literature, and previously unpublished data from the authors' laboratories, shows that the δ13C of organic matter in marine macroalgae and seagrasses collected from the natural environment ranges from -3 to -35‰, which correlates primarily with taxonomy and secondarily with ecology. Expand
Phenotypic characteristics and composition of rhizobia associated with woody legumes growing in diverse Kenyan conditions
Over 480 rhizobia were isolated from root nodules of woody legume and herbaceous trap host species grown in soils collected from 12 different Kenyan sites, demonstrating a high diversity of tropical rhZobia associated with trees. Expand
Genetic and symbiotic characterization of rhizobia isolated from tree and herbaceous legumes grown in soils from ecologically diverse sites in Kenya
The high diversity (rhizobial genotypes, host affinities and their symbiotic effectiveness) found in the Kenyan sites will require rigorous selection for host×strain×site combinations in order to obtain effective and competitive inoculants for legume trees and crops in rehabilitation and agroforestry programmes. Expand
Seaweeds in cold seas: evolution and carbon acquisition.
It is possible that heterokont, dinophyte and haptophyte phototrophs only evolved after the Carboniferous-Permian ice age and so did not encounter low sea surface temperatures until the Antarctic cooled some 15 Ma ago, and the impact of low temperatures on photosynthesis by marine macrophytes is predicted to favour diffusive CO(2) entry rather than aCO(2)-concentrating mechanism. Expand
Characterisation of rhizobia from African acacias and other tropical woody legumes using Biolog and partial 16S rRNA sequencing.
A Biolog (sole carbon source utilisation) user database of tropical and temperature rhizobial strains was created and used in conjunction with the partial 16S rRNA sequencing method to characterise 12 rhizOBial isolates from African acacias and other tropical woody legumes, showing congruence with genotypic fingerprinting. Expand
The role of CO2 uptake by roots and CAM in acquisition of inorganic C by plants of the isoetid life-form: a review, with new data on Eriocaulon decangulare L.
The work described here shows that submerged specimens of the North American Eriocaulon decangulare have a high fraction of their dry weight in the root system, a trait characteristic of isoetids but uncommon in other submerged vascular plants. Expand
Transport and assimilation of inorganic carbon by Lichina pygmaea under emersed and submersed conditions.
P pH drift experiments support the notion that HCO3 - is used in photosynthesis and the high value of δ13 C, the low CO2 compensation partial pressure, and the relatively high affinity for inorganic C are consistent with the operation of an in organic C concentrating mechanism. Expand
The Structure of Nitrogen Fixing Root Nodules on the Aquatic Mimosoid Legume Neptunia plena
The structure of nodules from aquatic and vermiculite-grown plants were compared, particular attention being paid to the cell layers external to the infected region (the nodule cortex) because, in other species, these are believed to be the site of an oxygen diffusion resistance mechanism. Expand
The occurrence of infected cells, with persistent infection threads, in legume root nodules
A survey of the structure of nodules from primitive legume trees was conducted and it is suggested that infection threads may have evolved in infected cells and later extended to early stages of the infection process including entry into root hairs. Expand
Single and multi-strain rhizobial inoculation of African acacias in nursery conditions
Inoculation can result in substantial gains in nitrogen fixation in African acacias; multi-strain inoculation is preferable to single strain inoculation in some circumstances; A. nilotica and A. tortilis have at least moderate nitrogen fixation potential and the wide genetic variation found suggests that substantial improvement may be obtained by selection for this character. Expand