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  • Trimorphic incompatibility  (2)
  • Clonal aquatic plant  (1)
  • Global Warming, F53 - International Agreements and Observance  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Sexual plant reproduction 12 (2000), S. 203-208 
    ISSN: 1432-2145
    Schlagwort(e): Key words Tristyly ; Trimorphic incompatibility ; Pollen trimorphism ; Partial incompatibility ; Clonal aquatic plant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Eichhornia azurea (Pontederiaceae) is a mat-forming, clonal aquatic that inhabits lakes, marshes and river systems in many parts of the Neotropics. The species is tristylous with long-, mid-, and short-styled morphs commonly represented in natural populations. To investigate whether E. azurea possesses a trimorphic incompatibility system typical of tristylous species, we conducted a controlled pollination experiment on 15 clones representing the three style morphs from a natural population near Rosario, Argentina. Comparisons of fruit and seed set following self-, illegitimate, and legitimate pollinations clearly demonstrated the presence of trimorphic incompatibility in E. azurea. Self- and illegitimate pollinations produced significantly less fruit and seed than legitimate pollinations in all three style morphs. Pollen from the two anther levels within a flower exhibited contrasting compatibility relations in self-pollinations. In common with several other tristylous species in Pontederiaceae, the expression of self-incompatibility was weakest in the mid-styled morph and strongest in the short-styled morph. We discuss the ecological and evolutionary significance of the partial expression of trimorphic incompatibility in E. azurea.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical and applied genetics 70 (1985), S. 355-362 
    ISSN: 1432-2242
    Schlagwort(e): Trimorphic incompatibility ; Pontederia cordata L.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Pontederia cordata L. (Pontederiaceae), a perennial diploid, possesses the rare genetic polymorphism tristyly. A controlled pollination programme was conducted over a three year period, under glasshouse conditions, on 36 clones of P. cordata var. cordata to examine the nature of the self-incompatibility system. The three major findings of the pollination study were: (1) the three floral morphs display different levels of self-incompatibility, (2) pollen from the two anther levels within a flower exhibits different compatibility behaviour in self-pollinations, (3) considerable individual genetic variation in the expression of self-incompatibility is evident among clones within floral morphs. Similar results were also obtained from a smaller study on 15 clones of P. cordata var. lancifolia conducted over a 6 month period. In common with other Pontederia species the mid-styled morph (M) of P. cordata produces large amounts of seed when self-pollinated with pollen from long-level anthers. A developmental model is proposed to explain the high level of self-compatibility of the M morph in Pontederia species. Self-pollination of segregating progenies from M and S morphs of known incompatibility status demonstrated that the expression of incompatibility is closely associated with style length. It is suggested that overall differences in incompatibility behaviour among the floral morphs may be due to the pleiotropic effects of major genes controlling sub-characters of the tristylous syndrome, rather than linked modifier genes. However, the variable expression of trimorphic incompatibility within floral morphs suggests that this variation may be polygenic in origin.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2014-07-23
    Beschreibung: Due to the failure of international efforts to limit atmospheric concentrations of greenhouse gases, consideration is now being given to solar geoengineering—a deliberate intervention to limit global warming without altering the atmospheric concentration of greenhouse gases. In contrast to emission cuts, geoengineering is expected to be cheap, quick to lower temperature, and feasible through the use of a single intervention. However, geoengineering is an imperfect substitute for emission reductions and will likely have undesirable side effects, only some of which can be anticipated before geoengineering is deployed. Most importantly, because geoengineering can be undertaken unilaterally, it creates issues of governance: Who gets to decide if, when, and how geoengineering should be attempted? This article provides an introduction to the key issues surrounding the governance of this unprecedented technology. ( JEL : Q54, F53, K33)
    Schlagwort(e): Q54 - Climate ; Natural Disasters ; Global Warming, F53 - International Agreements and Observance ; International Organizations, K33 - International Law
    Print ISSN: 1750-6816
    Digitale ISSN: 1750-6824
    Thema: Energietechnik , Politikwissenschaft , Wirtschaftswissenschaften
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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