Papers by jose pires lemos-filho
PloS one, 2015
Knowledge of the role of Neotropical montane landscapes in shaping genetic connectivity and local... more Knowledge of the role of Neotropical montane landscapes in shaping genetic connectivity and local adaptation is essential for understanding the evolutionary processes that have shaped the extraordinary species diversity in these regions. In the present study, we examined the landscape genetics, estimated genetic diversity, and explored genetic relationships with morphological variability and reproductive strategies in seven natural populations of Cattleya liliputana (Orchidaceae). Nuclear microsatellite markers were used for genetic analyses. Spatial Bayesian clustering and population-based analyses revealed significant genetic structuring and high genetic diversity (He = 0.733 ± 0.03). Strong differentiation was found between populations over short spatial scales (FST = 0.138, p < 0.001), reflecting the landscape discontinuity and isolation. Monmonier´s maximum difference algorithm, Bayesian analysis on STRUCTURE and principal component analysis identified one major genetic disc...
Anais da Academia Brasileira de Ciencias, Jan 9, 2017
Banded iron formations (BIF) have a particular vegetation type and provide a good model system fo... more Banded iron formations (BIF) have a particular vegetation type and provide a good model system for testing theories related to leaf phenology, due to unique stressful environmental conditions. As a consequence of the stressful conditions of BIF environment, we hypothesize that most species would retain at least some significant canopy cover, even at the end of the dry season, independently of growth form - trees, shrubs, and sub-shrubs. Considering the strong seasonality, we also hypothesize that photoperiod and rainfall act as triggers for leaf fall and leaf flushing in these environments. The majority of the fifteen studied species had a semi-deciduous behavior and shed their leaves mainly during the dry season, with a recovery at the end of this season. In general, leaf flushing increased around the spring equinox (end of the dry season and start of the rainy season). A trade-off between leaf loss and leaf maintenance is expected in a community in which most plants are naturally ...
Revista Brasileira de …, 2004
-(Chlorophyll fluorescence parameters in populations of two legume trees: Stryphnodendron adstrin... more -(Chlorophyll fluorescence parameters in populations of two legume trees: Stryphnodendron adstringens (Mart.) Coville (Mimosoideae) and Cassia ferruginea (Schrad.) Schrad. ex DC. (Caesalpinoideae)). The aim of this study was to investigate the photosynthetic performance in populations of two legume tree species, Stryphnodendron adstringens (Mimosoideae), typical from Cerrado, and Cassia ferruginea (Caesalpinoideae) from the Atlantic Rain Forest. The photosynthetic traits were assessed by measures of chlorophyll fluorescence in progenies of naturally pollinated plants from three populations of S. adstringens and a population of C. ferruginea. Plants of S. adstringens growing under similar conditions of C. ferruginea plants demanded higher light values for photosynthesis saturation, 600 µmol.m-2 .s-1 and 350 µmol.m-2 .s-1 respectively, and showed higher intrinsic photosynthetic efficiency of photosystem II, Fv/Fm of 0.814 versus 0.783 in C. ferruginea. The highest values of Fv/Fm observed in S. adstringens can explain the highest electron transport rates (ETR) obtained for this species. No significant differences were found among progenies from different C. ferruginea trees nor among populations of S. adstringens, and only in few cases, variation among progenies within populations were found for S. adstringens plants. The fact that fluorescence parameters distinguished species but not populations or most of progenies may be related to low intraspecific genetic variation of these chlorophyll fluorescence traits or due to lack of expression on genetic differences in plants under no stressful conditions. Key words-chlorophyll fluorescence, legume trees, population approach, quantum yield RESUMO-(Parâmetros da fluorescência da clorofila em populações de duas leguminosas arbóreas: Stryphnodendron adstringens (Mart.) Coville (Mimosoideae) e Cassia ferruginea (Schrad.) Schrad. ex DC. (Caesalpinoideae)). O objetivo do estudo foi avaliar a performance fotossintética em populações de duas leguminosas arbóreas, Stryphnodendron adstringens (Mimosoideae), uma espécie típica do Cerrado e Cassia ferruginea (Caesalpinoideae), que ocorre na Mata Atlântica. Os parâmetros de fotossíntese foram obtidos por medições de fluorescência da clorofila em progênies de plantas naturalmente polinizadas provenientes de três populações de S. adstringens e de uma população de C. ferruginea. Plantas de S. adstringens crescendo sob as mesmas condições que plantas de C. ferruginea, demandaram, comparativamente, valores mais elevados de luz para a saturação da fotossíntese, respectivamente 600 µmol.m-2 .s-1 e 350 µmol.m-2 .s-1 , e apresentaram uma mais elevada eficiência intrínseca do fotossistema II, Fv/Fm de 0,814 versus 0,783 em C. ferruginea. Os maiores valores de Fv/Fm observados em S. adstringens podem explicar as maiores taxas relativas de transporte de elétrons (ETR). Não foram encontradas diferenças significativas entre progênies das árvores de C. ferruginea, nem entre populações de S. adstringens, e apenas algumas poucas diferenças entre progênies dentro de populações de S. adstringens. O fato de parâmetros da fluorescência da clorofila distinguir espécies, mas não populações ou progênies pode estar relacionado à baixa variação genética destes caracteres de fluorescência da clorofila ou devido a ausência da expressão das diferenças genéticas em plantas sob condições não estressantes. Palavras-chave-abordagem populacional, fluorescência da clorofila, leguminosas arbóreas, rendimento quântico
Annals of Botany, 2005
Methods During a 15-month period, individuals from two populations in Cerrado, two in the Atlan... more Methods During a 15-month period, individuals from two populations in Cerrado, two in the Atlantic Forest, and six in transitional zones (three in a cerrado-like environment and three in forest fragments) were evaluated in Minas Gerais State, Brazil. The individuals were ...
The Brazilian Cerrado is the most diverse savanna in the world. Phylogeographical patterns for Ce... more The Brazilian Cerrado is the most diverse savanna in the world. Phylogeographical patterns for Cerrado tree species are relatively congruent; however, the causes of these patterns are not clear. Ours aims were to investigate phylogeographical patterns in two co-distributed Annona spp. in the Cerrado and identify the factors responsible for their genetic structure. We sequenced non-coding plastid DNA regions and estimated divergence times using a Bayesian Markov chain Monte Carlo method implemented in BEAST. Generalized linear mixed models (GLMMs) were used to relate genetic divergence with spatial, climatic and phytogeographic data. Annona crassiflora possessed only one haplotype, whereas A. coriacea possessed nine haplotypes constituting two groups: western and eastern. Haplotype diversification first occurred in the Pliocene; the split between eastern and western groups was dated to the Early Pleistocene. GLMMs detected a weak association of genetic distance with current climatic factors, represented mainly by precipitation in the warmest months. In A. coriacea, the north of central Cerrado (around Serra Geral de Goi as) is suggested as a putative Pleistocene refugium. The current climate and dispersal and local adaptation processes probably contribute to maintaining the east–west genetic structure in A. coriacea. Both Annona spp. show idiosyncratic population histories, reminiscent of the complex biogeography of the Cerrado.
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Papers by jose pires lemos-filho