Abstract
Anther and pollen development is a highly conserved process in angiosperms, but while pollen formation in annual plants occurs in a few days, in temperate woody perennials, it requires several months. How anther and pollen development is framed in terms of seasonality plays a clear part in reproductive success. In this study, seasonal anther and pollen development is characterized in two sweet cherry cultivars over 2 years, paying special attention to the period of dormancy and unveiling the role of starch in this process. We evaluated starch content from the autumn until bud burst with the help of an image analysis system fitted to a light microscope. Microscope observations allowed the temporal relationship of pollen development to the phenological stages of flower and bud development to be determined. In both cultivars and years, anther and pollen development followed the same pattern. Development was halted by dormancy, when the anthers showed no morphological changes until several weeks after chilling fulfillment, until the milder temperatures reactivated development. After dormancy, starch was accumulated in the connective tissue until tracheary element differentiation. Quantification of starch in the connective tissue of anthers revealed its importance in supporting pollen meiosis and subsequent anther growth.
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This work was supported by the Ministerio de Ciencia, Innovación y Universidades—European Regional Development Fund, European Union: Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria [grant numbers RFP2015-00015-00, RTA2014-00085-00, RTA2017-00003-00] and Gobierno de Aragón—European Social Fund, European Union [Grupos Consolidados A43, A12_17R].
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Fadón, E., Herrero, M. & Rodrigo, J. Anther and pollen development in sweet cherry (Prunus avium L.) in relation to winter dormancy. Protoplasma 256, 733–744 (2019). https://doi.org/10.1007/s00709-018-01332-4
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DOI: https://doi.org/10.1007/s00709-018-01332-4