Crassulaceae of the Kalanchoe laetivirens species have ornamental potential, but are poorly studied, especially their reproductive biology and trophic resources made available to visitors. The aim of this study, therefore, was to characterize the reproductive system of K. laetivirens through analyses of floral morphology, trophic resources and floral visitors. Floral structures, pollen / egg ratio, in vitro pollen germination, pollen grain structure in scanning microscopy and the availability of trophic resources by the evaluation of potential and instant nectar were described. The survey of floral visitors was carried out, and the pollen and nectar collection frequencies were recorded. The results show that the species has tubular flowers, complete with tetramer calyx and corolla, eight epipetalous stamens and four pistils with pluriovulated ovaries. Based on pollen / ovule ratio, this species is optionally autogamous. Morphologically, the pollen grain is small, tricolporate and has radial symmetrywith in vitro germination facilitated in the presence of sucrose (20%). Visitors mostly collected pollen with the highest frequency of visits at 9:30 am. The production of instant nectar had little variation between the evaluated times. The results are relevant to the understanding of the reproductive biology of Kalanchoe laetivirens and its relationship with floral visitors.
O presente trabalho teve como objetivo avaliar o desempenho agronômico da rúcula sob diferentes manejos da cobertura de solo. O experimento foi realizado em Florianópolis – SC com delineamento em blocos casualizados, com quatro tratamentos e quatro repetições. Foi utilizada a cultivar Rococó, semeada diretamente em campo em um espaçamento de 5 x 15 cm entre plantas e entre linhas, respectivamente. Os tratamentos consistiram na testemunha (sem capina), cobertura morta, lona plástica e capina manual. Avaliou-se o número de folhas, área foliar e massa fresca. O experimento foi finalizado aos 33 dias após a semeadura. Os dados foram submetidos à análise de variância e ao teste de Tukey para diferenciar as médias a 5% de probabilidade. A capina manual das plantas espontâneas foi significativamente superior à ausência de capina para a área foliar, massa fresca e produtividade. Não houve diferenças entre os tratamentos para o número de folhas. Os resultados demonstraram melhor desempenho da rúcula quando manejada com capina manual, mas os manejos com cobertura morta ou lona plástica apresentaram desempenho similar, também sendo alternativas viáveis.
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