Sexual dimorphism in a gynodioecious species, Aruncus aethusifolius (Rosaceae)

Sexual dimorphism in a gynodioecious species, Aruncus aethusifolius (Rosaceae) The sexual system of Aruncus aethusifolius (Amygdaloideae, Rosaceae), which is endemic to Korean, remains poorly understood. Here, we investigate the sexual system of A. aethusifolius based on a detailed morphological, micromorphological, and anatomical study. The natural population of this endemic species is restricted to Hallasan Mountain on Jeju Island. We found two types of plants in the natural population: hermaphrodite and female plants. Each sexual morph exhibited different floral traits, showing a modest form of sexual dimorphism. Significant quantitative differences were detected in the investigated organs (i.e., petal, sepal, ovary, stamen, nectary, and follicle). For example, hermaphroditic floral organs (i.e., petal, sepal, stamen and nectary) were larger than those of the female flowers (P < 0.001), but the ovary and follicle were relatively larger in female flowers than in hermaphrodites (P < 0.001). The fruit-setting rate (proportion of matured fruits/flowers) in female individuals (approximately 79.29%) was, on an average, more than twice that of hermaphroditic ones (approximately 34.41%). In addition, female flowers produced more seeds per follicle. Usually, 5–6 seeds per follicle developed in female flowers, whereas 3–4 seeds were produced in the hermaphroditic flowers. Accordingly, A. aethusifolius is another example of a gynodioecious species of flowering plants with clear sexual dimorphism. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Systematics and Evolution Springer Journals

Sexual dimorphism in a gynodioecious species, Aruncus aethusifolius (Rosaceae)

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Publisher
Springer Vienna
Copyright
Copyright © 2018 by Springer-Verlag GmbH Austria, part of Springer Nature
Subject
Life Sciences; Plant Sciences; Plant Ecology; Plant Anatomy/Development; Plant Systematics/Taxonomy/Biogeography
ISSN
0378-2697
eISSN
2199-6881
D.O.I.
10.1007/s00606-018-1493-4
Publisher site
See Article on Publisher Site

Abstract

The sexual system of Aruncus aethusifolius (Amygdaloideae, Rosaceae), which is endemic to Korean, remains poorly understood. Here, we investigate the sexual system of A. aethusifolius based on a detailed morphological, micromorphological, and anatomical study. The natural population of this endemic species is restricted to Hallasan Mountain on Jeju Island. We found two types of plants in the natural population: hermaphrodite and female plants. Each sexual morph exhibited different floral traits, showing a modest form of sexual dimorphism. Significant quantitative differences were detected in the investigated organs (i.e., petal, sepal, ovary, stamen, nectary, and follicle). For example, hermaphroditic floral organs (i.e., petal, sepal, stamen and nectary) were larger than those of the female flowers (P < 0.001), but the ovary and follicle were relatively larger in female flowers than in hermaphrodites (P < 0.001). The fruit-setting rate (proportion of matured fruits/flowers) in female individuals (approximately 79.29%) was, on an average, more than twice that of hermaphroditic ones (approximately 34.41%). In addition, female flowers produced more seeds per follicle. Usually, 5–6 seeds per follicle developed in female flowers, whereas 3–4 seeds were produced in the hermaphroditic flowers. Accordingly, A. aethusifolius is another example of a gynodioecious species of flowering plants with clear sexual dimorphism.

Journal

Plant Systematics and EvolutionSpringer Journals

Published: Jan 29, 2018

References

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