Luciana Dias Thomaz

Florística de um trecho de floresta de restinga no município de Guarapari, Espírito Santo, Brasil

The Paulo Cesar Vinha State Park (PCVSP), in Setiba, Guarapari Municipality (ES), is the best studied of all restinga conservation units in the state of Espirito Santo. But there is still much to be learned concerning the flora of some of the plant communities found here. From 1997 to 2000, plants were collected on random walks through approximately four hectares of forest that covers the outer beach ridges of the PCVSP. A total of 172 species were surveyed, belonging to 54 families. The most species-rich families are Myrtaceae (25 spp.), Bromeliaceae (14), Orchidaceae (13), Sapotaceae (10), Lauraceae (7), and Rubiaceae (7).The most common geographic distribution pattern, based on the literature, was that of Atlantic coast species, followed by widespread species, species found on both the Atlantic coast and in central Brazil, disjunct species and those endemic to Espirito Santo. Floristic similarity with other coastal areas is directly related to the distance between these areas. The presence of endemic and threatened species in the neighborhood of the Park reinforces the need for effective conservation of this area and provides the incentive to create other conservation units in the restingas of Espirito Santo State.

Mimosoideae (Leguminosae) do Parque Estadual Paulo César Vinha, Espírito Santo, Brasil

O Parque Estadual Paulo Cesar Vinha (PEPCV) constitui uma importante area de preservacao do Espirito Santo e mesmo sendo a regiao litorânea melhor estudada no Estado, trabalhos taxonomicos ainda apresentam-se escassos. Este estudo consiste no levantamento floristico-taxonomico de Mimosoideae do PEPCV. Foram realizadas coletas quinzenais, entre agosto/2008 a junho/2009, percorrendo trilhas pre-existentes no interior do Parque, alem de caminhadas aleatorias de forma a contemplar todas as fitofisionomias. Mimosoideae esta representada por 10 taxons, reunidos em cinco generos: Albizia , Inga , Mimosa , Piptadenia e Senegalia . O genero mais representativo em numero de especies foi Mimosa (4 spp.), seguido por Inga (3 spp.). Os demais generos apresentaram uma especie cada. Inga subnuda subsp. luschnathiana (Benth.) T.D.Penn., Mimosa elliptica Benth. e Mimosa sensitiva L. var. sensitiva sao novas citacoes para o estado do Espirito Santo e Mimosa candollei R.Grether, Mimosa pudica var. hispida Brenan, Piptadenia adiantoides (Spreng.) J.F.Macbr. e Senegalia lacerans (Benth.) Seigler & Ebinger sao novas citacoes para o PEPCV. O trabalho inclui chaves de identificacao dos taxons, descricoes, ilustracoes, dados sobre distribuicao geografica, preferencia por habitat, taxonomia e fenologia.

Taraxerol 4-Methoxybenzoate, an in vitro Inhibitor of Photosynthesis Isolated from Pavonia multiflora A. St-Hil. (Malvaceae)

A phytochemical study of Pavonia multiflora A. St‐Hil. (Malvaceae) led to the isolation through chromatographic techniques of 10 secondary metabolites: vanillic acid (1), ferulic acid (2), p‐hydroxybenzoic acid (3), p‐coumaric acid (4), loliolide (5), vomifoliol (6), 4,5‐dihydroblumenol A (7), 3‐oxo‐α‐ionol (9), blumenol C (10), and taraxerol 4‐methoxybenzoate (8), the latter being a novel metabolite. Their structures were identified by 1H‐ and 13C‐NMR, using one‐ and two‐dimensional techniques, and X‐ray crystallography. In this work, we report the effect of compounds 5 and 8 on several photosynthetic activities in an attempt to search for new compounds as potential herbicide agents that affect photosynthesis. Both compounds inhibited the electron flow from H2O to methyl viologen; therefore, they act as Hill reaction inhibitors. Using polarographic techniques and studies of the fluorescence of chlorophyll a, the interaction sites of these compounds were located at photosystem II.