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Habitat-correlated seed germination and morphology in populations of Phillyrea angustifolia L. (Oleaceae)

Published online by Cambridge University Press:  14 February 2017

Sara Mira ,
Alberto Arnal  and
Félix Pérez-García
Sara Mira
Affiliation:
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Alberto Arnal
Affiliation:
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Félix Pérez-García*
Affiliation:
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
*
*Correspondence Email: [email protected]
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Abstract

The broad aim of this work was to study intraspecific variation of seed germination in Phillyrea angustifolia L. (Oleaceae), a species with a hard (water-permeable) endocarp. Germination of seeds from six different wild populations was correlated with traits related either to seed morphology or to environmental parameters. Germination of naked seeds (seeds without endocarp) at the optimum germination conditions was similar among populations and individuals, but great differences could be detected regarding the germination of seeds with endocarp both at inter- and intra-populational levels. Differences among populations could be related to climatic parameters and to morphometric variables of seeds with endocarp. A higher germination was associated with populations growing in habitats with more severe summer (higher temperature, lower precipitation and a longer drought period) and producing elongated seeds (lower Feret ratio and roundness). Moreover, seeds from eight different individuals within a population were tested independently, and great differences regarding the germination of seeds with endocarp could be detected among individuals. Our results suggest that the morphological variation found in P. angustifolia endocarp is both under strong maternal genetic control as well as influenced by environmental factors, as indicated by the high variability among individuals within one population and the significant correlation between climate variables and seed germination among populations. Finally, it is emphasized that standardization of plant propagation protocols should take into account the degree of intraspecific variation of Mediterranean species.

Keywords

climate changehard endocarpinter-population variabilityintra-population variabilityPhillyrea angustifoliaphysiological dormancyseed dormancyseed germination
Type
Research Papers
Information
Seed Science Research , Volume 27 , Issue 1 , March 2017 , pp. 50 - 60
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Copyright
Copyright © Cambridge University Press 2017 

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