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• W2102019932 abstract "In most flowering plants, pollen is dispersed as monads. However, aggregated pollen shedding in groups of four or more pollen grains has arisen independently several times during angiosperm evolution. The reasons behind this phenomenon are largely unknown. In this study, we followed pollen development in Annona cherimola, a basal angiosperm species that releases pollen in groups of four, to investigate how pollen ontogeny may explain the rise and establishment of this character. We followed pollen development using immunolocalization and cytochemical characterization of changes occurring from anther differentiation to pollen dehiscence.Our results show that, following tetrad formation, a delay in the dissolution of the pollen mother cell wall and tapetal chamber is a key event that holds the four microspores together in a confined tapetal chamber, allowing them to rotate and then bind through the aperture sites through small pectin bridges, followed by joint sporopollenin deposition.Pollen grouping could be the result of relatively minor ontogenetic changes beneficial for pollen transfer or/and protection from desiccation. Comparison of these events with those recorded in the recent pollen developmental mutants in Arabidopsis indicates that several failures during tetrad dissolution may convert to a common recurring phenotype that has evolved independently several times, whenever this grouping conferred advantages for pollen transfer." @default.
• W2102019932 created "2016-06-24" @default.
• W2102019932 creator A5006741255 @default.
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• W2102019932 creator A5051571483 @default.
• W2102019932 date "2009-10-29" @default.
• W2102019932 modified "2023-10-10" @default.
• W2102019932 title "Pollen development in Annona cherimola Mill. (Annonaceae). Implications for the evolution of aggregated pollen" @default.
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• W2102019932 doi "https://doi.org/10.1186/1471-2229-9-129" @default.
• W2102019932 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2774696" @default.
• W2102019932 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19874617" @default.
• W2102019932 hasPublicationYear "2009" @default.
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