Biblioteca do Café
URI permanente desta seção${dspace.url}/handle/123456789/1
Navegar
3 resultados
Resultados da Pesquisa
Item Coffea arabica L: History, phenology and climatic aptitude of the state of São Paulo, Brazil(Instituto Biológico, 2021-12-17) Torres, Guilherme Almussa Leite; Campos, Cleide Nascimento; Salomon, Marcus Vinicius; Pantano, Angélica Prela; Almeida, Julieta Andrea Silva deThe genus Coffea belongs to the Rubiaceae family and includes two species with optimum economic performances, Coffea arabica and Coffea canephora. The state of São Paulo is one of the states that produce the species C. arabica in Brazil. Arabica coffee has been of great importance to São Paulo, providing relevant contributions to the historical, political, architectural, gastronomic, touristic, artistic, agricultural, industrial and social sectors since its introduction into the state in the nineteenth century. The agricultural sector includes crops produced by both small farmers and by highly technological agricultural groups. Coffea arabica plants present six phenological phases, all sensitive to changes in temperature and rainfall. In the reproductive phases, the species requires short days, low temperatures and no rainfall, followed by the rainy season. However, the phenological phases of the coffee plants can be harmed or even inhibited by dry or rainy seasons that are too long or too short. In the state of São Paulo, the municipalities of Garça and Franca show optimal coffee productivity, whereas those of Adamantina and Registro are low, and the agricultural aptitudes of these four municipalities show strong relationships with their geographical distributions in the state. Garça and Franca are situated in areas where the predominant dry and rainy seasons favor the occurrence of the phenological phases of arabica coffee plants, whereas Adamantina and Registro are located in areas with long dry and rainy seasons, respectively, characteristics that harm the development of the reproductive phenological phases of this culture.Item Water stress in germination, growth and development of coffee cultivars(Associação Brasileira de Tecnologia de Sementes - ABRATES, 2018) Almeida, Julieta Andréa Silva de; Azevedo, Mary Túlia Vargas Lobato Guedes de; Salomon, Marcus Vinicius; Medina, Priscila FratinThe aim of this study was to evaluate the effect of water stress on the germination of Coffea arabica seeds and the growth and development of plants from these seeds. Seeds of the cultivars Bourbon Vermelho, Mundo Novo, and BA-10 were placed to germinate in the dark at 30 ºC in the presence and absence of 100 g/L of polyethylene glycol 6000. The water stress applied delayed the beginning of seed germination by seven days in relation to seeds of the control, which had achieved responses of up to 50%, but there were no differences between the treatments at the end of the experiment. Furthermore, the length of the primary root in seeds germinated under water stress was less than in the control treatment, especially for the cultivar Mundo Novo. Plants of the cultivars Bourbon Vermelho and Mundo Novo developed from seeds previously germinated under water stress exhibited reduced height and fewer leaf pairs than those from the control, whereas ‘BA-10’ responded in a similar way in both treatments. Thus, the cultivars Bourbon Vermelho and Mundo Novo were more sensitive to the water stress applied in the germination phase than ‘BA-10’.Item Effect of temperature and cytokinin on the capacity of direct somatic embryogenesis in Coffea arabica L. genotypes(Editora UFLA, 2014-07) Almeida, Julieta Andréa Silva de; Leal, Rebeca Rocha; Carmazini, Valéria Cristina Barbosa; Salomon, Marcus Vinicius; Guerreiro-Filho, OliveiroThe vegetative multiplication of Coffea arabica hybrids can be carried out by direct somatic embryogenesis. The objective of this study was to verify if temperature and cytokinins could influence the capacity for direct somatic embryogeneis in arabica genotypes. For this purpose foliar explants taken from adult plants of three C. arabica genotypes, hybrids 812 and 956 and cultivar Catuaí, were inoculated into a culture medium with 1⁄2 MS salts, 20.0 g l -1 sucrose and 30 μM 6-benzyladenine (6-BA) or 10 μM 2-isopenteniladenina (2-iP) and submitted to temperatures of 25 and 30 oC in the absence of light. The treatments were evaluated with respect to the number of somatic embryos formed per foliar explant, at 270 days after the beginning of the experiment. A completely random experimental design was adopted with a 3 x 2 x 2 (genotype x temperature x plant growth regulator) factorial scheme, with ten replications per treatment and two explants in each. Temperature of 30 o C favored significantly the formation of somatic embryos when compared to 25 o C and this response pattern predominated amongst the three genotypes. On the other hand, 6-BA and 2-iso-pentenladenine caused similar answers for the majority of genotypes. The results of this study showed that temperature has a significant influence on the direct somatic embryogenesis capacity of C. arabica genotypes.