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  • Angiosperms  (2)
  • Recombinations  (2)
  • refinery effluent  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Utilization of wild relatives in the genetic improvement of Arachis hypogaea L. (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 164-169 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Arachis ; Autotetraploid ; Chromosome pairing ; Genomic relationships ; Recombinations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Autotetraploids were established from 8 diploid wild species of section Arachis. In all the autotetraploids the chromosomes paired largely as bivalents even though they possess the ability to pair as multivalents. Pollen and pod fertility in the C1 generation were not directly associated with chromosome pairing. The C2 generation autotetraploids showed a gradual increase in bivalent associations and pollen and pod fertility. The identification of two genomes, A and B, in the diploid species and in the tetraploid, A. hypogaea, of the section Arachis, a fairly good crossability, and the type of chromosome associations observed in hybrids between A. hypogaea and the autotetraploids of wild Arachis species indicated good prospects of utilizing autotetraploids as genetic bridges in transferring desired traits from these taxa into groundnut.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00266988
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  • 2
    Digitale Medien
    Digitale Medien
    Utilization of wild relatives in the genetic improvement of Arachis hypogaea L. (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 433-439 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Arachis ; Amphidiploids ; Genomes ; Chromosome pairing ; Recombinations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Synthetic amphidiploids were established in 32 combinations involving 8 diploid wild species representing both A and B genomes of section Arachis. Bivalent and multivalent associations in the amphidiploids of 7 A genome species confirm that these species have identical genomes. Contrastingly, high bivalent frequencies in amphidiploids involving the A and B genome species suggest that A. batizocoi has a distinct ‘B’ genome that is partially homologous to the other genome ‘A’ represented in the rest of the species. Crossability, chromosome pairing and pollen and pod fertility in hybrids between A. hypogaea and amphidiploids have revealed that these amphidiploids can be used as a genetic bridge for the transfer of genes from the wild species into the cultivated groundnut.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00289523
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  • 3
    Digitale Medien
    Digitale Medien
    Putative genome donors ofArachis hypogaea (Fabaceae), evidence from crosses with synthetic amphidiploids (1988)
    Springer
    Plant systematics and evolution 160 (1988), S. 143-151 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Fabaceae ; Arachis hypogaea ; Amphidiploids ; chromosome pairing ; genome ; putative ancestors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Chromosome pairing, pollen and pod fertility in hybrids between cultivated tetraploidArachis hypogaea and 15 synthetic amphidiploids from 8 diploid species (7 of the A genome and 1 of the B genome) of sect.Arachis have been utilized for the identification of putative genome donors in the evolution of cultivatedA. hypogaea. These results, in conjunction with evidence from morphological similarities, phytogeographical distribution and some phytochemical features, confirm the segmental amphidiploid origin ofA. hypogaea. A. batizocoi andA. duranensis are suggested as the donors of the B genome and the A genome respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00936041
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  • 4
    Digitale Medien
    Digitale Medien
    An analysis of interspecific hybrids and phylogenetic implications inCucumis (Cucurbitaceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 237-252 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Cucurbitaceae ; Cucumis ; Interspecific crossability ; chromosome pairing ; pollen fertility ; phylogenetic relationship ; karyomorphology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Investigations on interspecific crossability in 8Cucumis species (2n = 24) and chromosome pairing and pollen fertility of their hybrids from 15 combinations have been utilized for tracing the phylogenetic relationships among these taxa and factors responsible for their differentiation. A collective evaluation of data suggests that there are three broad groups of species, one of the spiny fruited interfertile species, whose hybrids show varying degree of chromosome associations and low to high pollen fertility; the second of species with non-spiny fruits, which are completely incompatible with the former but weakly compatible with the cultivated species,C. melo L. to produce partly developed seeds, and the third group ofC. metuliferus E. Mey. exSchrad. andC. melo and its different botanical varieties. The species with spiny fruits can be further divided based on karyomorphological similarities and/or on relative genomic affinity, indicated by chromosome pairing and hybrid pollen fertility.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00989386
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  • 5
    Digitale Medien
    Digitale Medien
    Algal epilithon and water quality of a stream receiving oil refinery effluent (1989)
    Springer
    Hydrobiologia 184 (1989), S. 193-199 
    Details
    ISSN: 1573-5117
    Schlagwort(e): epilithic algae ; stream ; refinery effluent ; species diversity ; water quality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Changes in epilithic algal communities colonizing introduced substrata were determined in a stream polluted with oil refinery effluent at Digboi (Assam, India). The number of algal taxa was reduced but the growth of blue-green algae, particularly two species ofOscillatoria, was encouraged. Epilithic biomass (as chlorophylla) also declined at polluted stations. The algal community of the upstream station was markedly different from the community occurring just after the confluence of effluent; however, the differences were gradually reduced downstream, indicating improvement in water quality. Of the various criteria tested for possible relationships with the level of pollutants, species richness, Shannon diversity and biomass showed significant relationships. The study demonstrates the usefulness of algal criteria for monitoring oil pollution in running waters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00027028
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  • 6
    Digitale Medien
    Digitale Medien
    Algal epilithon and water quality of a stream receiving oil refinery effluent (1989)
    Springer
    Hydrobiologia 184 (1989), S. 193-199 
    Details
    ISSN: 1573-5117
    Schlagwort(e): epilithic algae ; stream ; refinery effluent ; species diversity ; water quality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Changes in epilithic algal communities colonizing introduced substrata were determined in a stream polluted with oil refinery effluent at Digboi (Assam, India). The number of algal taxa was reduced but the growth of blue-green algae, particularly two species ofOscillatoria, was encouraged. Epilithic biomass (as chlorophylla) also declined at polluted stations. The algal community of the upstream station was markedly different from the community occurring just after the confluence of effluent; however, the differences were gradually reduced downstream, indicating improvement in water quality. Of the various criteria tested for possible relationships with the level of pollutants, species richness, Shannon diversity and biomass showed significant relationships. The study demonstrates the usefulness of algal criteria for monitoring oil pollution in running waters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02392956
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