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• W2078517574 abstract "The gender of dimorphic plant species is often affected by ecophysiological variables. Differences have been interpreted as a response of the sexes to meet specific resource demands associated with reproduction. This study investigated whether sex-specific variations in ecophysiological traits in response to water availability determine the performance of each sex in different habitats, and therefore promote extreme spatial segregation of the sexes in the subdioecious plant, Honckenya peploides. Twenty-seven plants of each sex were individually potted in dune sand and assigned randomly to one of three water treatments. Well-watered plants were watered daily to field capacity, whereas plants in the moderate and high-water stress treatments received 40% and 20%, respectively, of the water given to well-watered plants. Photochemical efficiency, leaf spectral properties and components of relative growth rate (leaf area ratio and net assimilation rate) were measured. Photochemical efficiencies integrated over time were higher in male than in female plants. Water deficit decreased maximum quantum yield in female plants more rapidly than in male plants, but female plants (unlike male plants) had recovered to initial values by the end of the experiment. Maximum quantum yield in male plants was more affected by water stress than in female plants, indicating that male plants were more susceptible to photoinhibition. The two sexes did not differ in growth rate, but male plants invested a higher proportion of their biomass in leaves, had a higher leaf area per unit biomass and lower net assimilation rate relative to female plants. Female plants had a higher water content and succulence than male plants. Differences in stomatal density between the sexes depended on water availability. The results suggest that the two sexes of H. peploides have different strategies for coping with water stress. The study also provides evidence of sex differences in allocation traits. We conclude that between-sex differences in ecophysiological and allocation traits may contribute to explain habitat-related between-sex differences in performance and, therefore, the spatial segregation of the sexes." @default.
• W2078517574 created "2016-06-24" @default.
• W2078517574 creator A5021973187 @default.
• W2078517574 creator A5091050878 @default.
• W2078517574 date "2009-03-01" @default.
• W2078517574 modified "2023-10-12" @default.
• W2078517574 title "Sex-specific physiological, allocation and growth responses to water availability in the subdioecious plant<i>Honckenya peploides</i>" @default.
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• W2078517574 doi "https://doi.org/10.1111/j.1438-8677.2008.00105.x" @default.
• W2078517574 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19228331" @default.
• W2078517574 hasPublicationYear "2009" @default.
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