Análise comparativa da anatomia foliar de Melastomataceae em ambiente de vereda e cerrado sensu stricto

Abstract

ABSTRACT(Comparative analysis of Melastomataceae leaf anatomy in palm swamp and cerrado sensu stricto environments). Th is study describes the anatomy of the leaf blade of three species of Melastomataceae, Lavoisiera bergii Cogn., Macairea radula (Bonpl.) DC. and Trembleya parvifl ora (D. Don) Cogn., which colonize the fl ooded and open areas of a lower zone of palm swamp, and the M. radula and T. parvifl ora, which occur in cerrado sensu stricto, of the Estação Ecológica de Águas Emendadas, Planaltina, DF. Structural data of the three species indicate sclerophylly with particular characteristics to each of them, such as projections on epidermal cells of L. bergii, diff erent types and position of emergencies in L. bergii and M. radula and the protrusion in the epidermis of T. parvifl ora. Anatomical characterization of the leaves of M. radula and T. parvifl ora did not diff er between environments. However, the leaf blades of individuals of M. radula and T. parvifl ora found in the palm swamp showed plasticity in relation to individuals from the cerrado sensu stricto. Signifi cantly higher values (P ≤ 0.05) for the thickness of the mesophyll and chlorophyll parenchyma, leaf mass and specifi c leaf mass were found in the palm swamp. Th is relationship is reversed for values of specifi c leaf area. Th e ability to provide structural plasticity together with sclerophylly may be relevant to the invasive behavior of these species in the palm swamp as emphasized in the discussion. Moreover, this work also presents a brief discussion of other aspects related to the importance of anatomical structures in the taxonomy and ecology of these species.

Leaf anatomy of Qualea parviflora (Vochysiaceae) in three phytophysiognomies of the Mato Grosso State, Brazil

“…The Cerrado has different phytophysiognomies, and very few studies about its ecological plant anatomy have been found, such as those conducted by Somavilla and Ribeiro (2011), and Bieras (2009), who suggest the adaptive strategies adopted by plant species typical of savannah environments.…”

Leaf characters of Lavoisiera, Microlicia and Trembleya (Microlicieae, Melastomataceae) and their implications for taxonomy

“…; Cassiano et al. ; Somavilla & Graciano‐Ribeiro ). In other tribes such as Miconieae and Melastomeae (Reis et al.…”

“…Regarding the epidermis, the greater sinuosity of the cell wall on the abaxial leaf surface and the presence of hypostomatic leaves, which have also been observed in T. parviflora (D. Don) Cogn. (Somavilla & Graciano‐Ribeiro ), are frequent in Trembleya . However, these characters may also occur in Lavoisiera , Microlicia, and Rhynchanthera species and are considered important for the recognition of species.…”

“…; Romero & Castro ; Romero et al. , , ) as well as to understand adaptations to different environmental conditions (Somavilla & Graciano‐Ribeiro ).…”

Does plant architectural complexity increase with increasing habitat complexity? A test with a pioneer shrub in the Brazilian Cerrado

“…Intraspecific variation may maximise resource capture (Grime and Mackey, 2002), which potentially contribute to the colonisation of heterogeneous habitats. To date, most studies addressing intraspecific variation in plant traits of Cerrado species have focused on comparison of individuals occurring in habitats with two opposing environmental conditions, such as open versus shaded (Rossatto and Kolb, 2010) or dry versus flooded physiognomies (Somavilla and Graciano-Ribeiro, 2011). The patchy distribution of Cerrado physiognomies makes such a dichotomous distribution unrealistic, so knowledge on trait variation along ecological gradients is especially important for a better understanding of trait-environment associations in the Cerrado (Bedetti et al, 2011).…”