Platycodon grandiflorus is an ornamental species that can be marketed as a potted flower; however, it has fragile and bending floral stems. Plant growth regulators, such as paclobutrazol, are compounds that reduce stem elongation, enabling the production of plants with a more compact formation. This study aimed to evaluate the effects of paclobutrazol on platycodon growth, in a greenhouse. A completely randomized blocks experimental design was used in a 4 × 5 factorial scheme, with four replicates. The treatments consisted of four varieties of ‘Astra Semi-Double’ platycodon (Blue, Lavender, Pink and White) and five paclobutrazol doses (0, 1.25, 2.5, 3.75 and 5.0 mg pot-1). The paclobutrazol application did not affect the stem diameter, number of leaves, days until anthesis, number of flowers or flower buds, and flower diameter. The shoot length, leaf area and shoot dry mass decreased with higher doses of the growth regulator. Lavender showed the highest values for shoot length, number of leaves, leaf area and shoot dry mass. Pink had the earliest anthesis, followed by Blue and White, whereas Lavender had the latest anthesis. The dose of 3.75 mg pot-1 of paclobutrazol efficiently controlled the growth and improved the visual quality of all the platycodon varieties.

A fragmentação de habitats causa diversos impactos ecossistêmicos. A resposta da vegetação às mudanças ambientais a tornam um bom indicador do estado de conservação da biodiversidade. O objetivo deste trabalho foi avaliar a conservação de um fragmento de Cerradão no município de Cáceres, MT, pela análise da estrutura horizontal e da diversidade de espécies do estrato arbóreo-arbustivo. O levantamento foi baseado em dois conglomerados aleatorizados, totalizando 8 parcelas em 0,8 ha. O critério de inclusão foi o diâmetro a 1,30 m do solo ≥ 10 cm. Foram amostrados 411 indivíduos, 44 espécies e 21 famílias botânicas. As famílias Fabaceae e Bignoniaceae apresentaram as maiores riquezas. Os valores dos índices de diversidade de Shannon-Weaver e de equabilidade de Pielou foram considerados elevados (3,18 e 0,84, respectivamente). A similaridade florística entre os conglomerados foi alta (índice de Sørensen = 74,63%), indicando homogeneidade no fragmento. A distribuição diamétrica apresentou o padrão J-invertido. A comunidade apresentou tendência ao agregamento, com índice de agregação de Payandeh médio (1,40). A riqueza e estrutura da vegetação indicaram bom estado de conservação do estrato arbóreo-arbustivo, pois não foram observadas alterações florístico-estruturais no fragmento oriundas das pressões antrópicas do entorno da área.

Tectona grandis L.f. (Teak) is a highly cultivated forest species in Brazil. When industrially processed, it generates a large amount of sawdust, a waste that has limited reuse and accumulates in the industrial yards. The aim of this study was to evaluate the effect of fresh teakwood sawdust on the development of Urochloa brizantha (Hochst. ex A.Rich.) R.D.Webster cv. Xaraés in a nursery. The treatments consisted of concentrations of 0, 5, 10, 20, 33 and 50% of sawdust, arranged in four randomized blocks in split-plots. At 45, 75 and 120 days, plant heigh (h), average tillers diameter (d), number of live (nll) and dead leaves per plant, fresh and dry mass of shoots and roots, and Dickson's quality index (dqi) were measured. There was a decrease in h growth, d, nll, fresh and dry mass of shoots and roots and in the dqi of the cv. Xaraés as it increased to concentration of wood sawdust in the substrate. This negative effect can be attributed to the high C/N ratio of sawdust (196/1), which influences the decomposition of organic matter. In addition, the possible Teak allelopathic effects, which are the subject of other studies, should be considered. Unlike the other variables, number of live leaves was not influenced by the treatment with 5% sawdust. Teakwood sawdust has negative effects on the U. brizantha cv. Xaraés development.

This study aimed to catalogue and characterize the shrub and tree species in a fragment of Cerradão, in order to produce a dichotomous key based on dendrological characteristics, for the identification of the species in the region. The study area is located in the Cerrado-Pantanal transition, in Cáceres, Mato Grosso State, Brazil, and presents an area of 3 hectares that was divided into 32 plots of 48x20 m. The survey was carried out by inventorying the individuals with a diameter ≥ 5.0 cm, at 30 cm from the ground. The key was elaborated upon the observed dendrological characters. A total of 84 species, 73 genera and 34 families were recorded. Fabaceae (21 spp.), Malvaceae (6 spp.), Anacardiaceae/Bignoniaceae (5 spp.), Rubiaceae (4 spp.) and Euphorbiaceae/Vochysiaceae (3 spp.) accounted for 55.95% of the species richness. Among the genera, Bauhinia stood out with three species. The studied fragment has a high species richness, and whereas it presents the most typical components of the region, it also presented low similarity with other areas of the same phytophysiognomy. O estudo objetivou a catalogação e a caracterização das espécies arbóreo-arbustivas em um fragmento de Cerradão, a fim de confeccionar uma chave dicotômica baseada em características dendrológicas para identificação das espécies da região. A área está localizada na transição Cerrado-Pantanal, em Cáceres, MT, e possui 3 hectares que foram divididos em 32 parcelas de 48 x 20 m. O levantamento foi censitário, inventariando os indivíduos com diâmetro ≥ 5,0 cm a 30 cm do solo. A chave foi elaborada a partir da compilação dos caracteres dendrológicos observados e caracterizados. Foram amostradas 84 espécies, pertencentes a 73 gêneros e 34 famílias. As famílias Fabaceae (21 espécies), Malvaceae (6 espécies), Anacardiaceae/Bignoniaceae (5 spp. cada), Rubiaceae (4 spp.) e Euphorbiaceae/Vochysiaceae (3 spp. cada) contabilizaram 55,95% da riqueza de espécies. Entre os gêneros, Bauhinia se destacou com três espécies. O fragmento possui alta riqueza específica, e mesmo com a maioria dos componentes típicos de Cerradão, apresentou baixa similaridade com outras áreas desta fitofisionomia.