MIMOSOIDEAE (FABACEAE) DA REGIÃO DO MANSO, ANTÔNIO DIAS, MINAS GERAIS: DISTRIBUIÇÃO GEOGRÁFICA E SIMILARIDADE FLORÍSTICA NA FLORESTA ATLÂNTICA

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Abstract

RESUMO A Região do Manso, localizada a 785 m de altitude no município de Antônio Dias, leste de Minas Gerais (19°41'15''S, 42°48'45''W), está no domínio Atlântico na formação da floresta estacional semidecídua montana. No inventário das Mimosoideae ocorrentes na região, foram encontrados nove táxons que neste trabalho são analisados quanto aos limites de distribuição geográfica e somente os arbóreos são avaliados como indicadores das relações florísticas entre a região do Manso e outras áreas de Floresta Atlântica do Sudeste brasileiro. São eles: Senegalia martiusiana (Steud.) Seigler & Ebingler, Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altschul, Anadenanthera peregrina (L.) Speg, Inga vera subsp. affinis (DC.) T.D. Penn., Mimosa debilis Humb. & Bonpl. ex Willd. var. debilis, Mimosa pellita Humb. & Bonpl. ex Willd. var. pellita, Piptadenia gonoacantha (Mart.) J.F. Macbr., Plathymenia reticulata Benth. e Stryphnodendron polyphyllum Mart. Cinco padrões de distribuição geográfica foram estabelecidos: 1. Anfiatlântico (1sp.); 2. Neotropical (1sp.); 3. América do Sul Ocidental-Centro-Oriental (4spp.); 4. Brasil Centro-Oriental (2spp.); 5. Brasil Atlântico Nordeste-Sudeste (1sp.). Os táxons quanto à preferência de habitat, foram tratados como elementos florísticos generalistas (100%) e especialistas (0%) do domínio Atlântico. Os resultados mostram maior similaridade entre o Manso e trechos de floresta situados nas altas elevações. Existem similaridades florísticas entre as florestas ombrófila densa e estacionais semidecíduas do sudeste, apoiando a proposição de origem comum dessas fitofisionomias.

Translated abstract

ABSTRACT Manso's region is located at 785m of altitude in Antônio Dias town, east of Minas Gerais State, Brazil, which is in the Atlantic domain in a formation of Seasonal Semideciduous Montane Forest. In the inventory of Mimosoideae of that region, it wase found nine taxa which are analyzed regarding the limits of geographic distribution and only the arboreal are evaluated as floristic relation indicators between the region of Manso and other areas of southeastern Brazilian Atlantic forest. They are: Senegalia martiusiana (Steud.) Seigler & Ebingler, Anadenanthera colubrina (Vell.) Brenan var. cebil (Griseb.) Altschul, Anadenanthera peregrina (L.) Speg, Inga vera subsp. affinis (DC.) T.D. Penn., Mimosa debilis Humb. & Bonpl. ex Willd. var. debilis, Mimosa pellita Humb. & Bonpl. ex Willd. var. pellita, Piptadenia gonoacantha (Mart.) J.F. Macbr., Plathymenia reticulata Benth. and Stryphnodendron polyphyllum Mart. Five geographical distribution standards had been established: 1. Anfiatlântico (1sp.); 2. Neotropical (1sp.); 3. South America Occidental-Center-Oriental (4spp.); 4. Brazil Center-Oriental (2spp.); 5. Atlantic Brazil Northeast-Southeast (1sp.). The taxa according to their preference habitat were labelled as floristic general elements (100%) and specialist elements (0%) of the Atlantic domain. The results show greater similarity between Manso and the forest stretches located in high elevations. There are floristic similarities between the dense mountain rain and seasonal semideciduous southeastern forest, supporting the proposal of common origin of these phytophysiognomies.

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A phylogeny of legumes (Leguminosae) based on analysis of the plastid matK gene resolves many well-supported subclades within the family.

Martin Wojciechowski, Matt Lavin, Michael J Sanderson (2004)

Phylogenetic analysis of 330 plastid matK gene sequences, representing 235 genera from 37 of 39 tribes, and four outgroup taxa from eurosids I supports many well-resolved subclades within the Leguminosae. These results are generally consistent with those derived from other plastid sequence data (rbcL and trnL), but show greater resolution and clade support overall. In particular, the monophyly of subfamily Papilionoideae and at least seven major subclades are well-supported by bootstrap and Bayesian credibility values. These subclades are informally recognized as the Cladrastis clade, genistoid sensu lato, dalbergioid sensu lato, mirbelioid, millettioid, and robinioid clades, and the inverted-repeat-lacking clade (IRLC). The genistoid clade is expanded to include genera such as Poecilanthe, Cyclolobium, Bowdichia, and Diplotropis and thus contains the vast majority of papilionoids known to produce quinolizidine alkaloids. The dalbergioid clade is expanded to include the tribe Amorpheae. The mirbelioids include the tribes Bossiaeeae and Mirbelieae, with Hypocalypteae as its sister group. The millettioids comprise two major subclades that roughly correspond to the tribes Millettieae and Phaseoleae and represent the only major papilionoid clade marked by a macromorphological apomorphy, pseudoracemose inflorescences. The robinioids are expanded to include Sesbania and members of the tribe Loteae. The IRLC, the most species-rich subclade, is sister to the robinioids. Analysis of the matK data consistently resolves but modestly supports a clade comprising papilionoid taxa that accumulate canavanine in the seeds. This suggests a single origin for the biosynthesis of this most commonly produced of the nonprotein amino acids in legumes.