Multidisciplinary approaches for species delimitation inSisyrinchium(Iridaceae)
Autor: | Lilian Eggers, Camila Dellanhese Inácio, Eliane Kaltchuk-Santos, Tatiana T. Souza-Chies, Juliana Maria Fachinetto |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
Ecology biology Pollination Biodiversity Selfing Outcrossing Plant Science Reproductive isolation biology.organism_classification 010603 evolutionary biology 01 natural sciences Taxon Evolutionary biology Botany Sisyrinchium Ploidy Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
Zdroj: | Plant Species Biology. 33:3-15 |
ISSN: | 0913-557X |
Popis: | A remarkable morphological similarity in natural populations of different groups of Sisyrinchium spp. (Iridaceae) makes classification of some species difficult. The present paper focused on two morphological categories of S. sellowianum (MC-I and MC-II) with distinct morphological traits. Morphological, cytogenetic, reproductive biology and genetic studies were performed, aiming to elucidate and better characterize such variation. The basic chromosome number established for the species was x = 9 and diploid and tetraploid populations were observed for MC-I, whereas MC-II showed only diploid populations. Different pollen morphologies were recognized in each morphological category. Based on pollination experiments, MC-I is out-crossing, whereas MC-II is selfing. The populations were highly differentiated (FST = 0.46, θB = 0.62). In MC-I, observed variation was greater within populations (69%) than among populations (31%), whereas in MC-II, 61% of the variation was among populations and 39% within populations. This study evidenced that the two morphological categories correspond to distinct and reproductively isolated species and that floral traits reflect their breeding system, with allogamous plants in MC-I and autogamous in MC-II. Furthermore, MC-II is unveiled as S. platycaule, a neglected taxon of Sisyrinchium in Brazil. The tools applied in this study were substantially able to check the identity of the two morphological categories as two different species and present the variation encountered in the taxa. |
Databáze: | OpenAIRE |
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