Nova ocorrência de Poaceae para a América do Sul: alloteropsis (Panicoideae/Poaceae)

Background Numerous groups of plants have adapted to CO2 limitations by independently evolving C4 photosynthesis. This trait relies on concerted changes in anatomy and biochemistry to concentrate CO2 within the leaf and thereby boost productivity in tropical conditions. The ecological and economical importance of C4 photosynthesis has motivated intense research, often relying on comparisons between distantly related C4 and non-C4 plants. The photosynthetic type is fixed in most species, with the notable exception of the grass Alloteropsis semialata. This species includes populations exhibiting the ancestral C3 state in southern Africa, intermediate populations in the Zambezian region and C4 populations spread around the paleotropics. Scope We compile here the knowledge on the distribution and evolutionary history of the Alloteropsis genus as a whole and discuss how this has furthered our understanding of C4 evolution. We then present a chromosome-level reference genome for a C3 individual and compare the genomic architecture to that of a C4 accession of A. semialata. Conclusions Alloteropsis semialata represents one of the best systems to investigate the evolution of C4 photosynthesis as the genetic and phenotypic variation provides a fertile ground for comparative and population-level studies. Preliminary comparative genomic investigations show the C3 and C4 genomes are highly syntenic, and have undergone a modest amount of gene duplication and translocation since the different photosynthetic groups diverged. The background knowledge and publicly available genomic resources make Alloteropsis semialata a great model for further comparative analyses of photosynthetic diversification.

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Alloteropsis semialata as a study system for C4 evolution in grasses

Pereira

Bianconi

Osborne

et al. 2023

Annals of Botany

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Composição florística e chave de identificação das Poaceae ocorrentes nas savanas costeiras amazônicas, Brasil

2014

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RESUMOAs savanas da região costeira da bacia amazônica estão situadas no complexo contato entre a floresta e a costa atlântica. Nestas formações as Poaceae se destacam como um dos grupos vegetais mais importantes. O presente trabalho objetivou o levantamento da Família Poaceae nas savanas costeiras amazônicas, a elaboração de uma lista de espécies acrescida de ilustrações e chave para a identificação dos táxons confirmados. Foram registradas quatro subfamílias, 58 espécies, distribuídas em 29 gêneros, sendo Axonopus e Paspalum os mais ricos. As amostras encontram-se depositadas nos herbários do Museu Paraense Emílio Goeldi (MG) e do Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá (HAMAB). As savanas costeiras amazônicas apresentam espécies de Poaceae de ampla distribuição, baixo endemismo e reduzido número de espécies exóticas, com influência florística das savanas das Guianas e do Bioma Cerrado. PALAVRAS-CHAVE: Gramineae, riqueza de espécies, Amazônia Floristic composition and identification keys for Poaceae from the Amazonian coastal savannas, Brazil ABSTRACTThe savannas of the coastal region of the Amazon basin are located at the contact between the forest and the Atlantic coast. In these formations, the Poaceae are one of the most important plant groups. This work aimed to survey Family Poaceae in Amazonian coastal savannas. In addition, it was given illustrations and key for identification of taxon corroborated. A total of four subfamilies, 29 genera and 58 species were recorded. All specimens are deposited in the herbaria MG (Museu Paraense Emílio Goeldi) and HAMAB (Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá). The flora of Poaceae inventoried in the Amazonian costal savannas presents wide distribution species, low endemism and few exotic species, with a clear floristic influence of the Guaianas savannas and Brazilian Cerrado.

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Nova ocorrência de Poaceae para a América do Sul: alloteropsis (Panicoideae/Poaceae)

Cited by 2 publications

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Alloteropsis semialata as a study system for C4 evolution in grasses

Alloteropsis semialata as a study system for C4 evolution in grasses

Composição florística e chave de identificação das Poaceae ocorrentes nas savanas costeiras amazônicas, Brasil

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