Manuel Losada Gavilanes

Plasticidade anatômica das folhas de Xylopia brasiliensis Sprengel (Annonaceae)

Leaf anatomy of Xylopia is still poorly explored. The species Xylopia brasiliensis Sprengel, commonly known as pindaiba occurs in primary forest and in modified vegetation in a wide range of environmental conditions. The present study describes some leaf anatomical characteristics of this species and quantitatively evaluates them in function of environmental, seasonal and plant height differences. This species has anatomical plasticity.

Flora arbustivo-arbórea de uma floresta ripária no alto Rio Grande em Bom Sucesso/MG

A floristic survey was carried out in a riparian forest of the Rio Grande in Bom Sucesso, Minas Gerais, Brazil, considering the species of trees and shrubs with diameter at the base of the stem >= 5 cm. The purpose was to produce a list of indigenous species for potential use in environmental rehabilitation programs that have bee carried out on the margins of rivers and dams of this region. A list is provided with 245 species of 65 botanic families. Floristic comparisons are made with florests surveyed in the State of Sao Paulo.

Flórula ruderal da cidade de Lavras, MG

A survey and identification of ruderal plants occuring in Lavras City, state of Minas Gerais, Brazil, was carried out. One hundred and seventy five species, representing 122 genera belonging to 41 families were indentified. Families Compositae, Leguminosae, Gramineae, Malvaceae, Convolvulaceae, Cyperaceae, Euphorbiaceae, and Amaranthaceae presented the greatest numbers of species among all families. All plant materials were collected in garden areas, along roadsides and streets, walls and fences, and wastelands.

Flora arbustivo-arbórea de um fragmento de mata ciliar no alto rio Grande, Itutinga, Minas Gerais

A floristic survey was carried out in an 9.450m2 fragment of riparian forest on the margin of the hydroelectric reservoir of Camargos, Itutinga, state of Minas Gerais, SE Brazil. All individuals with minimum diameter at the base of stem 5cm were surveyed in the sampled area forest. A list is provided with 253 species of trees and shrubs belonging to 66 botanic families. Floristic similarity indices were calculated in comparisons with other floristic surveys of forest in the states of Sao Paulo and Minas Gerais.

Identificação e caracterização das espécies arbóreas do canteiro central da Universidade Federal de Lavras/MG

O campus da Universidade Federal de Lavras possui 508 ha, sendo 117 ha de area construida onde se localizam os departamentos e setores. Nessa area esta o canteiro central, que divide as duas principais avenidas da universidade. Essa area e arborizada, porem, nao ha nenhum mapa com a localizacao das especies. Objetivou-se entao realizar um inventario dessas arvores, fazendo-se a locacao, identificacao, quantificacao e caracterizacao delas. A identificacao foi feita mediante observacao, consulta com outros profissionais, bibliografia especializada e herbario. Foram identificadas 46 especies arboreas distribuidas num total de 182 exemplares, pertencentes a 24 familias. A especie Callistemon viminalis G.Don ex Loud, popularmente conhecida como escova-de-garrafa, foi a que apresentou maior ocorrencia, com 23 individuos, seguida do ipe-roxo (Tabebuia impetiginosa (Mart.) Standl.), com 15 individuos. Das especies plantadas, 84% sao nativas. Observou-se uma variedade de especies locadas cumprindo o objetivo do plantio para uso em aulas praticas e embelezamento.

Plantas palustres e aquáticas que se comportam como invasoras, no Estado de Minas Gerais

Foram cadastradas as especies palustres e aquaticas com comportamento de plantas invasoras, quando da obstrucao de canais de irrigacao e drenagem de lagos, represas, ou ainda como competidoras em culturas irrigadas. As plantas cadastradas no presente trabalho somam um total de 113 especies, englobando 64 generos e 40 familias.

Plantas invasoras da cultura do feijoeiro (Phaseolus vulgaris L.) no Estado de Minas Gerais

Nas areas de cultura do feijoeiro (Phaseolus vulgaris L.), no Estado de Minas Gerais, foram coletadas e identificadas 222 especies de plantas invasoras (= plantas daninhas), pertencentes a 35 familias botânias, representando 118 generos, sendo que as familias Compositae, Leguminosae, Gramineae, Malvaceae, Convolvulaceae, Rubiaceae, Euphorbiaceae, Amaranthaceae, Cyperaceae e Solanaceae, sao as mais importantes em relacao a cultura. As plantas coletadas, devidamente etiquetadas e identificadas, foram anexadas no PAMG (Herbario da Empresa de Pesquisa Agropecuaria de Minas Gerais, Belo Horizonte - (MG.).

Efeito de thidiazuron na indução e manutenção de calos de erva-baleeira (Cordia verbenacea L.)

The influence of thidiazuron on calius formation and maintenance of Corola verbenacea was evaluated. Stem segments with 3 to 4cm length were excisedfrom greenhouse plants and surface sterilized with 30% commercial sodium hypochiorite for 10 minutes. Explants were inoculated with 5mm on Murashige and Skoog (MVRASHIGE & SKOOG, 1962) - MSsolid medium (0.6%) suppiemented with 0.22, 0.68, 2.04 and 6.13mM TDZ. Calius induction was observed 10 to 15 days after incubation. The media contaming, 2.04 and 6.13uM TDZ induced 75% expiam with calius. The calius when transferred to fresh culture medium exhibited active growth. The treatments containing lower concentration induced 50% expiam with caltus that when transferred to fresh culture medium, showed no development.

A flórula invasora da cultura do café (Coffea arabica L.) no Estado de Minas Gerais, Brasil

A survey in the cultivation area of coffee in the State of Minas Gerais, Brazil, has resulted in the determination of 388 weed species, of 182 genera belonging to 51 families; the families presenting a greater number of especies are: Compositae, Leguminosae, Gramineae, Malvaceae, Solanaceae, Rubiaceae, Convolvulaceae, Euphorbiaceae, Amaranthaceae and Verbenaceae with 65, 48, 42, 30, 19, 17, 16, 14, 12, 10 species, respectively.

MICROMORFOMETRIA FOLIAR DE PALICOUREA RIGIDA KUNTH. (RUBIACEAE) EM AMBIENTE DE CERRADO E CAMPO RUPESTRE

The objective of this work was to evaluate qualitative and quantitative leaf anatomical traits of Palicourea rigida Kunth. (Rubiaceae) species occurring in the Brazilian Cerrado and Campo Rupestre ecosystems. Anatomical analysis was performed in fresh or fixed leaves processed with usual plant microtechnique. Leaves showed uniseriate epidermis in petiole and leaf blade which contains uniseriate nonglandular tricomes (tector type) occurring only over the vascular bundles. Likewise, paracytic stomata were found only in abaxial side of the leaf surface. The mesophyll contains uniseriate palisade parenchyma and multiseriate spongy parenchyma (nine layers) which showed cells with different morphology and size. Crystal idoblasts of different types were observed in both the petiole and leaf blade. Collateral vascular bundles were found both in the petiole and leaf blade. Leaf venation type was pinnate, campylodromous or brochydodromous. The micromorphometric analysis showed significant differences from plants of different environments for all leaf characteristics and Cerrado plants showed higher means for all evaluated traits. Therefore, the influence of environments may had modulated morphological responses in P. rigida, since no difference was found in the type or distribution of leaf tissues in Cerrado or Campo Rupestre.