info:eu-repo/semantics/article
Uncovering the inflorescence evolution of Eleusininae (Cynodonteae: Chloridoideae: Poaceae)
Fecha
2020-01Registro en:
Muchut, Sebastián Elías; Reutemann Arnolfo, Andrea Guadalupe; Pilatti, Vanesa; Uberti Manassero, Nora Graciela; Vegetti, Abelardo Carlos; et al.; Uncovering the inflorescence evolution of Eleusininae (Cynodonteae: Chloridoideae: Poaceae); Oxford University Press; Botanical Journal of The Linnean Society; 192; 1; 1-2020; 208-223
0024-4074
CONICET Digital
CONICET
Autor
Muchut, Sebastián Elías
Reutemann Arnolfo, Andrea Guadalupe
Pilatti, Vanesa
Uberti Manassero, Nora Graciela
Vegetti, Abelardo Carlos
Reinheimer, Renata
Resumen
Inflorescence forms in grasses lead to a general assumption that their evolution is random. We reconstructed the ancestral inflorescence for Poaceae subtribe Eleusininae and outlined possible evolutionary pathways to test the hypotheses of (1) non-directionality in grass inflorescence evolution and (2) an evolutionary direction from complex to simpler inflorescence architectures in this lineage. By studying early stages of inflorescence and spikelet development, we investigated ontogenetic changes that may correlate with evolutionary pathways identified. The approach presented here indicates that the current diversity of inflorescences found in Eleusininae is probably a result of two distinct evolutionary pathways. The main path involves a multi-staged course with shortening of main axis internodes first, followed by a decrease in number of primary branches and florets per spikelet. We postulate that reduced elongation of the internodes may affect the apical and axillary meristems performance, which in turn promotes a decrease in the number of primary branches and floret per spikelet. Current diversity in inflorescences of Eleusininae may be a consequence of a reductive evolution. We found that the evolutionary directionality of inflorescences in Eleusininae may be associated with developmental events that affected inflorescence morphology at early stages.