Essays about: "pollen viability"

Found 4 essays containing the words pollen viability.

  1. 1. The forgotten sand bee. A follow up on the status of the golden sand bee Andrena marginata in municipality of Mark, a decade later

    University essay from Göteborgs universitet / Instiutionen för biologi och miljövetenskap

    Author : Monika Böttcher; [2024-03-19]
    Keywords : Golden sand bee; Andrena marginata; Devil´s bit scabious; Succisa pratensis; Oligolectic bees; Inventory; Meadow land; Conservation;

    Abstract : Over a decade ago, a conservation project aimed at preserving the endangered golden sand bee (Andrena marginata) populations in the Storån valley of the municipality of Marks was initiated. The species, red-listed in Sweden as well as in many other European country, specializes in pollen from Devil's bit. READ MORE

  3. 2. Does size matter? : A study on pollen size distribution and pollen viability in Silene latifolia and S. dioica

    University essay from Uppsala universitet/Växtekologi och evolution; Uppsala universitet/Institutionen för biologisk grundutbildning

    Author : Elliot Örjes; [2021]
    Keywords : Silene latifolia; silene dioica; pollen size; pollen tube; pollen viability;

    Abstract : Pollen size dimorphism, i.e., when a plant produces more than one size of pollen, has been observed in several plant families but the underlying mechanisms have rarely been discussed. One of the hypotheses is that the smaller pollen produced by individuals with bimodal pollen size distributions are dead or non-viable. READ MORE

  4. 3. Endosperm-based postzygotic hybridization barriers in Arabidopsis and Capsella

    University essay from SLU/Dept. Of Plant Biology

    Author : Mohammad Foteh Ali; [2021]
    Keywords : Endosperm development; Parental conflict; Genetic diversity; Auxin;

    Abstract : In Arabidopsis, endosperm development is very important for viable seed development. Especially, endosperm cellularization is a crucial event for embryo survival and if it fails, can lead to embryo arrest, as observed in seeds derived from interploidy and interspecies hybridization. READ MORE

  5. 4. Evaluation of transgenic Campanula carpatica plants

    University essay from SLU/Horticulture (until 121231)

    Author : Stefan Bengtsson; [2006]
    Keywords : ethylene; post-harvest; ert1-1;

    Abstract : In Campanula carpatica, the general problem is that the flowers are very sensitive to exogenous ethylene. Flowers that are exposed to ethylene wilt in two to three days. Treating the plants with anti-ethylene compounds can prevent the problems with ethylene. However, these compounds are very expensive and environmentally dangerous. READ MORE