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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative phenotypical expression of three mutant genes in barley and the basis for defining an ideotype for Mediterranean environments (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 762-768 
    Details
    ISSN: 1432-2242
    Keywords: Barley genetics ; Quantitative gene expression ; Ideotype ; Mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Three mutants induced in the two-rowed barley variety Beka and their three binary recombinants have been used in an attempt to define an ideotype suitable for Mediterranean agroclimatic conditions. Physiological methods (classical plant growth analysis) together with the study of genotype x environment interaction for grain yield were used to characterize the genotypes. That characterization brought out the huge phenotypical variation produced by only three mutant genes, suggesting that single Mendelian genes may alone explain the quantitative variation, including grain yield, without the necessity of using the polygenic concept. The genotype best adapted to the environments studied is later in heading and has shorter straw and denser spikes than Beka; it also has higher inverse of leaf area rate and grain: leaf area ratio, a lower rate of leaf senescence, and a shorter grain filling period than the original variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224189
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  • 2
    Electronic Resource
    Electronic Resource
    Ant pollination of the palaeoendemic dioeciousBorderea pyrenaica (Dioscoreaceae) (1995)
    Springer
    Plant systematics and evolution 198 (1995), S. 17-27 
    Details
    ISSN: 1615-6110
    Keywords: Dioscoreaceae ; Borderea pyrenaica ; Diptera ; Dioecy ; ant pollination ; reproductive biology ; Endemism ; Pyrenees
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The importance of ants for pollination in the dioeciousBorderea pyrenaica (Dioscoreaceae), a Tertiary palaeoendemic plant of the Pyrenees (NE Iberian Peninsula) was studied. The frequency of different visitors (ants, lady beetles, andDiptera) to staminate and pistillate flowers was quantified, and their effectiveness as pollinators was examined by means of fruit and seed set in selective experimental exclusions. Although ants were less abundant on flowers than other visitors, they were the most effective pollinators. Some qualitative factors of this mutualistic ant-plant interaction may account for their effectiveness: the small size of the ants, their high visitation rate to pistillate flowers, and the lack of reduction in viability of the pollen transported on the integument. In addition, the sedentary nature of ants assures their presence during the flowering period. The most abundant floral visitors ofB. pyrenaica were therefore not the most effective pollinators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985105
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