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Publication Type J
Authors Sanchez-Vilas, J. and R. Retuerto
Title Response of the sexes of the subdioecious plant Honckenya peploides to nutrients under different salt spray conditions
Source Ecological Research
Author Keywords Nutrient availability Photochemical efficiency Salt spray Sexual dimorphism Leaf spectral reflectance radiation-use efficiency photochemical reflectance index carbon-isotope discrimination tree ilex-aquifolium spectral reflectance sexual-dimorphism dioecious shrub chlorophyll fluorescence coastal dunes ratio
Abstract Sex dimorphic plants often show sex-specific differences in growth and biomass allocation. These differences have been explained as a consequence of the different reproductive functions performed by the sexes. Such differences may determine the performance of each sex in different habitats and therefore might explain the spatial segregation of the sexes described in many dimorphic plants. We examined the growth, reproductive and physiological responses of the sexes of the subdioecious plant Honckenya peploides to two levels each of salt spray and nutrients, which are assumed to be important selective forces in coastal environments. We found sex-related differences in H. peploides. In particular, females allocated proportionally more dry mass to reproduction and grew less and more slowly than males regardless of salt spray and nutrient conditions, which is interpreted as a trade-off between reproductive and vegetative growth. Regarding physiological response, nutrients significantly increased values of photochemical reflectance index (PRI) in females but not in males, suggesting that photochemical efficiency is more limited by nutrients in females than in males. PRI values also suggest intersexual differences in protection requirements against photoinhibition. The study did not find sex-differential responses to salt spray, which caused a decrease in reproductive effort in both sexes. The sex-related differences in relative growth rates, reproductive allocation and photosynthetic features found here may contribute to explaining habitat-related between-sex differences in performance and, therefore, the spatial segregation of the sexes observed in H. peploides.
Author Address [Sanchez-Vilas, Julia; Retuerto, Ruben] Univ Santiago de Compostela, Area Ecol, Santiago De Compostela 15782, Spain. Sanchez-Vilas, J (reprint author), Univ Santiago de Compostela, Area Ecol, Santiago De Compostela 15782, Spain. julia.sanchezvilas@gmail.com; ruben.retuerto@usc.es
ISSN 0912-3814
ISBN 0912-3814
29-Character Source Abbreviation Ecol. Res.
Publication Date Jan
Year Published 2012
Volume 27
Issue 1
Beginning Page 163-171
Digital Object Identifier (DOI) 10.1007/s11284-011-0884-6
Unique Article Identifier WOS:000302149200018
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