| Registro completo |
| Provedor de dados: |
Acta Botanica
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| País: |
Brazil
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| Título: |
Seed traits of species from South Brazilian grasslands with contrasting distribution
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| Autores: |
Martins,Alexandre Cristante
Marchioretto,Rafaella Migliavacca
Vieira,Ariane Tonetto
Stiehl-Alves,Eudes Maria
Santos,Eliane Kaltchuk dos
Souza-Chies,Tatiana Teixeira de
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| Data: |
2020-12-01
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| Ano: |
2020
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| Palavras-chave: |
Dormancy
Functional traits
Germination
Grasslands
Iridaceae
Photoinhibition
Regeneration niche
Reproductive ecology
Seed morphology
Time-to-event analysis
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| Resumo: |
ABSTRACT South Brazilian grasslands are among the most species-rich grasslands worldwide yet they have been suffering ongoing degradation due to land-use. Little is known about the reproductive ecology of the native species of these grasslands. Thus, our goal was to characterize seed traits and germination requirements of three native species of the tribe Tigridieae (Iridaceae, Iridoideae) due to its richness in the Pampa biome and the contrasting morphology, cytogenetics, and geographic distributions of its representatives. We tested if closely related species possess similar seed traits and whether species with wider distributions have broader germination requirements. Seed production and mass were estimated, and morphological analyses, germination experiments and viability tests were performed. Principal component analysis (PCA) was used to describe correlations between seed traits and species’ distributions. Germination was assessed using time-to-event analysis and the Cox model. All seed traits differed among the analyzed species/cytotypes. Final germination percentage (FGP) averaged 39.1 % and with overall viability of 89.9 %. Germination tests showed that seeds benefit from negative photoblasty. Species/cytotypes with wider distributions and heavier and larger seeds generally had better germination performances than narrower distributed species/cytotypes with lighter and smaller seeds.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400730
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| Editor: |
Sociedade Botânica do Brasil
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| Relação: |
10.1590/0102-33062020abb0012
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| Formato: |
text/html
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| Fonte: |
Acta Botanica Brasilica v.34 n.4 2020
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| Direitos: |
info:eu-repo/semantics/openAccess
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