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  • Anabaena
  • AGAMOUS
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  • 1
    Electronic Resource
    Electronic Resource
    Variation of geosmin content in Anabaena cells and its relation to nitrogen utilization (1991)
    Springer
    Archives of microbiology 157 (1991), S. 66-69 
    Details
    ISSN: 1432-072X
    Keywords: Geosmin ; Anabaena ; Nitrogen source ; Growth rate ; Earth odor ; Heterocyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The addition of the proper amount of ammonium to the culture medium containing nitrate as nitrogen source enhanced the growth rate of Anabaena viguieri. The amount of geosmin produced by these cells varied with the concentrations of ammonium added. A negative correlation between the amount of geosmin produced and of the growth rate of cells was revealed. This was also found in cells grown on various forms of nitrogen sources. Without supply of any nitrogen compound, this organism is capable of fixing gaseous nitrogen, and under these conditions the cells grew relatively slowly. However, they produced more geosmin (per unit protein mass) than cells grown in the presence of combined nitrogen. The isolation of heterocysts, in which nitrogen was fixed, showed that these cells produced higher amounts of geosmin than vegetative cells. The possible relation of nitrogen assimilation to the production of geosmin in the cells was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245337
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  • 2
    Electronic Resource
    Electronic Resource
    CaMADS1, a MADS box gene expressed in the carpel of hazelnut (1998)
    Springer
    Plant molecular biology 38 (1998), S. 1147-1160 
    Details
    ISSN: 1573-5028
    Keywords: hazelnut ; Corylus avellana ; MADS box genes ; flower development ; ovule ; AGAMOUS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hazelnut (Corylus avellana L.) is a species of economic interest that shows a peculiar floral biology. Unlike most of the angiosperms, which produce ovules during floral development such that they are ready for pollen at anthesis, hazelnut ovary development is delayed and triggered by compatible pollination. In order to elucidate the mechanisms regulating this unusual process and the role of the MADS box genes in ovary development, a cDNA library from pollinated styles of hazelnut was screened with a mixture of MADS box genes from different plant species. CaMADS1 (Corylus avellana MADS box), a floral-specific MADS box gene, was isolated, and characterized as belonging to the sub-family of the AGAMOUS genes. Northern blot, RT-PCR analyses and in situ hybridization experiments show a precise correlation between ovary development and CaMADS1 expression, indicating a role of this MADS box gene in the processes of floral organogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006022524708
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