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  • 1
    Electronic Resource
    Electronic Resource
    The Rhizobium meliloti host range nodQ gene encodes a protein which shares homology with translation elongation and initiation factors. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 3 (1989), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The Rhizobium meliloti nod region lib is involved in host-range determination: (i)the presence of region lib is necessary for transfer of alfalfa root hair curling ability to Rhizobium legumlnosarum biovar trifolii; (ii) a mutation in region llb extends the R. meliloti infection host range to Vicia sativa nigra; (iii) dominance of R. meliloti nod genes over R. leguminosarum biovar viciae nod genes is abolished by mutations in region llb. The nucleotide sequence of this region has been determined. Genes corresponding to the two open reading frames identified are designated nodP and nodQ. The predicted amino acid sequence of the NodQ protein shows homology with translation initiation and elongation factors. The consensus sequence involved in the GTP-binding domain is conserved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1989.tb00223.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of sink size on photosynthesis and carbohydrate content of leaves of three spring wheat varieties (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Photosynthesis and carbohydrate content of flag leaves were measured during the post-anthesis period of three spring wheat (Triticum aestivum L.) varieties grown with two levels of nitrogen supply, with ears either left intact or with the upper halves removed at anthesis. With low nitrogen supply, removing the upper half of the ear increased photosynthesis in the varieties Shasta and Anza, but not in Yecora. With high nitrogen, removing half ears inhibited photosynthesis in Yecora but had no effect on the other two varieties. Early in grain growth, halving ears decreased the contents of glucose, fructose (hexose), fructans and starch in leaves of Shasta and Anza, and increased those of Yecora, grown with low nitrogen level. The treatment of the ear increased hexose content of leaves of the three varieties supplied with high nitrogen level but had no effect on fructan and starch contents. Neither with high nor with low nitrogen level was leaf sucrose content affected by the treatment of the ear. There were significant correlations among levels of carbohydrates, the level of hexoses being most closely related to that of fructans. The rate of photosynthesis showed a significant negative regression over hexose levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05198.x
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  • 3
    Electronic Resource
    Electronic Resource
    Dry weight accumulation and starch-synthesis enzymes in grain of cultured ears of three winter wheat varieties (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 77 (1989), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Detached ears of three winter wheat (Triticum aestivum L.) varieties were cultured in solution for 12 days with sucrose levels varying from 36.5 to 292 mM. The dry weight and starch content of grains increased asymptotically with the sucrose level in the solution. At 4 days of culture, glucose phosphate isomerase (EC 5.3.1.9) activity grain−1 was lower with 36.5 mM than with higher sucrose levels in the medium; at 8 days, adenosinc diphosphoglucose pyrophosphorylase (EC 2.7.7.27) and (soluble plus bound) starch synthase (EC 2.4.1.21) activities grain−1 were higher with 146 and 292 mM sucrose than with 36.5 and 73 mM sucrose. The multiple regression of starch content over these enzyme activities showed that starch synthase was relatively more important as an independent variable. The dry weight and starch content of grains were higher in the variety Maris Huntsman than in Splendeur and Hobbit. The water content of grains was lower in Splendeur than in the other two varieties. At 4 days the glucose phosphate isomerase, adenosine diphosphoglucose pyrophosphorylase and starch synthase activities grain−1 were smaller in Splendeur than in Hobbit and Maris Huntsman and al 8 days they were higher in Maris Huntsman than in Hobbit and Splendeur. The varietal differences in starch content of grains were related to the activities of glucose phosphate isomerase and especially of starch synthase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1989.tb05977.x
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  • 4
    Electronic Resource
    Electronic Resource
    The effects of aluminium on nodulation and symbiotic nitrogen fixation in Casuarina cunninghamiana Miq. (1997)
    Springer
    Plant and soil 190 (1997), S. 41-46 
    Details
    ISSN: 1573-5036
    Keywords: actinorhizal plants ; aluminium toxicity ; Casuarina cunninghamiana ; Frankia ; nitrogen fixation ; nodulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In order to investigate the effects of Al on nodule formation and function in the Casuarina-Frankia symbiosis, inoculated plants were grown in sand culture at five nominal Al concentrations (0-880 μM Al) at pH 4.0. There was an Al-free control at pH 6.0 to assess the effects of pH 4.0 treatments. Mean N concentration of nodules was significantly less at pH 4.0 (1.83%) than at pH 6.0 (2.01%). There were nodulated plants at all Al levels, though there were fewer nodulated plants at 440 and 880 μM Al. Dry weights of nodules, shoots and roots were not reduced by Al concentrations at or below 220 μM Al, but were decreased by Al concentrations at or above 440 μM Al. Nodule weight expressed as a percentage of total weight did not differ significantly with respect to an Al-free control at pH 4. N concentrations of shoots and whole plants were significantly reduced at 440 μM Al. Nodular specific acetylene reduction activity (ARA) did not differ significantly among Al treatments. However, N2-fixation efficiency was decreased from 0.20 to 0.10 mg N fixed mg nodule dry weight−1 at 880 μM Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004259123008
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Growth promoting effect of Azospirillum brasilense on Casuarina cunninghamiana Miq. seedlings (1991)
    Springer
    Plant and soil 135 (1991), S. 121-124 
    Details
    ISSN: 1573-5036
    Keywords: associative effects ; Azospirillum ; Casuarina ; Frankia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The growth of Casuarina cunninghamiana seedlings was stimulated when inoculated with Azospirillum brasilense. This resulted in a higher biomass production than in uninoculated controls in the presence or absence of a non-nodulating strain of Frankia. Increase in whole plant dry weight was due to a significant increase in both shoot and root biomass, which corresponded with a higher total N content of the plants inoculated with Azospirillum. No such effects were observed under inoculation with a non-nodulating Frankia strain. These results suggest that the growth-promoting substances provided by A. brasilense may have enhanced the growth of Casuarina seedlings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014784
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    Paper (German National Licenses)
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