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Sex-related differences in leaf traits in an androdioecious shrub under contrasting levels of soil salinity

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Abstract

This study explores whether male and hermaphrodite plants of Phillyrea angustifolia (Oleaceae) show physiological and structural differences at the leaf level under severe water stress driven by drought and soil salinity. Leaf traits were measured in summer, at the height of the summer drought period, in male and hermaphrodite plants from two adjacent sites under contrasting soil salinity levels. Male plants from the saline site had significantly higher leaf proline content compared to males from the nonsaline site. By contrast, leaf proline levels were similarly low in hermaphrodite plants from both sites. On the other hand, hermaphrodite plants from the saline site had higher leaf stomatal frequency than hermaphrodites from the nonsaline site, whereas this parameter did not differ for male plants across sites. Such differences could be interpreted as the result of two different solutions to the same selective pressure in the androdioecious shrub P. angustifolia.

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Acknowledgements

We thank Francisco Bravo, director of Bahía de Cádiz Natural Park, for kindly providing facilities for field work; Ana Cruz for helping with leaf proline measurements, and Fernando Ramírez-Pousa and Antonio Nieto for helping with leaf glandular trichome and stomata counting; and Miguel Verdú, Roberto Salguero, John Pannell, and Juan Arroyo for providing useful comments on the manuscript. This study was funded by research projects BOS2002-00609 and AGL2005-07440-C02-02/FOR from the Spanish Ministerio de Educación y Ciencia, and by a FPI-MEC scholarship to JLMG.

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  1. Departamento de Biología, Universidad de Cádiz, Campus Río San Pedro, 11510, Puerto Real, Spain

    J. L. Medina-Gavilán, A. Bartual & F. Ojeda

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  1. J. L. Medina-Gavilán
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  2. A. Bartual
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  3. F. Ojeda
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Correspondence to F. Ojeda.

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Responsible Editor: Tibor Kalapos.

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Medina-Gavilán, J.L., Bartual, A. & Ojeda, F. Sex-related differences in leaf traits in an androdioecious shrub under contrasting levels of soil salinity. Plant Soil 310, 235–243 (2008). https://doi.org/10.1007/s11104-008-9653-x

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  • DOI: https://doi.org/10.1007/s11104-008-9653-x

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