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Relative embryo length as an adaptation to habitat and life cycle in Apiaceae

Filip Vandelook, Steven B. Janssens and Robin J. Probert
The New Phytologist
Vol. 195, No. 2 (July 2012), pp. 479-487
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/newphytologist.195.2.479
Page Count: 9
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Relative embryo length as an adaptation to habitat and life cycle in Apiaceae
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Abstract

Summary The factors driving the evolution of the relative embryo length in Apiaceae were examined. We tested the hypothesis that seeds with large relative embryo length, because of more rapid germination, are beneficial in dry and open habitats and for short-lived species. We also analyzed to what extent delayed germination as a result of embryo growth can be considered a dormancy mechanism. Hypotheses were tested by correlating the relative embryo length with other plant traits, habitat and climatic variables. The adaptive nature of the relative embryo length was determined by comparing the performance of a pure drift, Brownian motion (BM) model of trait evolution with that of a selection–inertia, Ornstein–Uhlenbeck (OU) model. A positive correlation of the relative embryo length with germination speed and negative correlations with the amount of habitat shade, longevity and precipitation were found. An OU model, in which the evolution of longer embryos corresponded to a transition to habitats of high light, or to a short life cycle, outperformed significantly a BM model. The results indicated that the relative embryo length may have evolved as an adaptation to habitat and life cycle, whereas dormancy was mainly related to temperature at the sampling sites.

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