Coffee Science
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3355
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Resultados da Pesquisa
Item Agronomic, anatomic and physiological characterization of Coffea arabica L. genotypes on irrigated system in the Central Cerrado(Universidade Federal de Lavras, 2022-12-29) Santos, Cyntia Stephânia dos; Matos, Nagla Maria Sampaio de; Rezende, Tiago Teruel; Mauri, Janaína; Rodrigues, Gustavo Costa; Veiga, Adriano Delly; Bartholo, Gabriel Ferreira; Carvalho, Milene Alves de FigueiredoDue to climatic conditions and the possibility of using machineries, coffee has a potential to achieve high yields with reduced costs, in the biome of Cerrado. Leaf anatomy and physiology can help in the identification of more adapted cultivars to a given environmental condition. The objective is to verify the behavior of Coffea arabica L. genotypes in the Cerrado of the Brazilian Central Plateau through anatomical and physiological characterization and yield. Ten coffee genotypes from the Active Germplasm Bank located in the municipality of Planaltina, Distrito Federal, were evaluated. The genotypes evaluated were: Araponga MG1, Catiguá MG2, Catiguá MG3 P23, Catiguá MG3 P7, Catiguá MG3 P51, Catiguá MG3 P, Catuaí Amarelo IAC 62, Catuaí Vermelho IAC 15, Paraíso MG1 and Topázio MG 1190. The phenotypic characteristics evaluated were the thickness of: adaxial cuticle surface, adaxial and abaxial epidermis surfaces, the palisade and spongy parenchyma, the mesophyll layer, the phloem, number and diameter of the xylem vessels, stomatal density, relationship between the polar and equatorial diameter of the stoma, specific leaf area, stomatal conductance, transpiration rate, net photosynthetic rate, water use efficiency, intercellular carbon concentration and yield. Genotypes of Coffea arabica L. presented a distinction between the characteristics evaluated when grown under climatic conditions of the Brazilian Central Plateau Cerrado, highlighting the variations in the behavior and distinguished adaptation in this environment. The Araponga MG1 genotype stood out for anatomical and physiological characteristics of higher values, such as net photosynthetic rate, stomatal conductance, intercellular carbon concentration, abaxial and adaxial epidermis thickness, stomatal density and number of xylem vessels. The genotype Paraíso MG1 stands out for higher grain productivity. The genotype Catuaí Vermelho IAC 15 stands out for anatomical and physiological characteristics such as higher stomatal density, greater number of xylem vessels and greater efficiency in water use, resulting in improved productivity.Item Arabica coffee cultivars in different water regimes in the central cerrado region(Editora UFLA, 2019-07) Veiga, Adriano Delly; Rodrigues, Gustavo Costa; Rocha, Omar Cruz; Bartholo, Gabriel Ferreira; Guerra, Antônio Fernando; Silva, Thiago Paulo daPhenotypic characterization of coffee cultivars under an irrigation system, as well as adaptability to controlled water stress, aiming at flowering uniformity, high yield and grain quality, plays an important role in coffee production in the cerrado areas. A field trial was carried out aiming to evaluate the agronomic performance of arabica coffee cultivars under different water regimes, using center pivot irrigation: irrigation throughout the year (WR1); suspended at the end of June for 40 days until leaf water potential reached -1.5 MPa (WR2); suspended at the end of June for 70 days until leaf water potential reached -2.3 MPa (WR3); suspended at the end of June for 100 days until leaf water potential reached -3.4 MPa (WR4); and a non-irrigated regime (WR5). The following traits were analyzed: plant height, stem diameter, canopy projection, number of plagiotropic branches, coffee grain yield, percentage of fruit in the cherry stage, and sieve retention percentages. Higher yield, plant growth, and percentage of fruit in the cherry stage are observed in the water regime with seventy days of controlled water stress (WR3). The Obatã IAC 1669-20 cultivar exhibits high yield and plant growth values in an irrigated system, and Catuaí Amarelo IAC 86 stands out in the non-irrigated system. For these genotypes, the coffee grain yield is most highly correlated with number of reproductive branches.Item Agronomic performance and adaptability of arabic coffee resistant to leaf rust in the central brasilian savanna(Editora UFLA, 2018-01) Veiga, Adriano Delly; Rocha, Omar Cruz; Guerra, Antônio Fernando; Bartholo, Gabriel Ferreira; Rodrigues, Gustavo Costa; Pereira, Welington; Silva, Thiago Paulo da; Silva, Evandro Ribeiro daBreeding programs and later indication of rust resistant cultivars for different environments and crops systems, in the concept of diseases integrated control, reach out for productivity raising and reduced production costs. The aim of this work was to evaluate the agronomic performance and adaptability of new Coffea arabica cultivars and progenies resistant to leaf rust in Central Brazilian Savanna. The experiment has been conducted since 2008 in an experimental area of Embrapa Hortaliças. Twenty three resistant cultivars, four progenies and three susceptible cultivars as controls, were assessed in a complete randomized block design with four replicates. The following traits were analyzed: plant height, stem diameter, canopy projection, number of plagiotropic branches, yield, grains percentage retained in sieves above 17, grain ripening and diseases resistance. Catucaí 2SL, Sacramento and Araponga stood out in vegetative growth. The highest yields are observed for IPR 103, Obatã 1669-20, Palma II, Sabiá 398 and Acauã, with values higher than 60 sacks per hectare. Among all these cultivars is observed high resistance to rust leaf and greater susceptibility to brown eye spot in the cultivar Acauã, for the place and period of evaluation.Item Análise da expressão do gene manose 6 fosfato redutase em cafeeiros submetidos ao déficit hídrico(Editora UFLA, 2013-01) Freire, Luciana Pereira; Marraccini, Pierre; Rodrigues, Gustavo Costa; Andrade, Alan CarvalhoOs efeitos do déficit hídrico sobre a expressão do gene CaM6PR, codificando a manose-6-fosfato redutase, foram avaliados em cafeeiros em fase de formação das cultivares IAPAR59 (Villa Sarchi x hibrido de Timor HT832/2) e RUBI MG 1192 (Mundo Novo x Catuaí) de Coffea arabica, consideradas respectivamente como tolerante e sensível ao estresse hídrico. As cultivares foram plantadas em dezembro de 2007 no campo experimental da Embrapa Cerrados – DF (CPAC) e cultivadas durante dois anos (2008 e 2009) com (I) e sem (NI) irrigação. Para cada ano, foram realizadas duas avaliações (P1, não estressado, durante a estação chuvosa e P2, estação seca). Para as duas cultivares, a expressão do gene CaM6PR foi medido em folhas por meio da técnica de PCR quantitativa, apresentou um forte aumento na estação seca para as plantas não irrigadas em comparação com as plantas irrigadas. Além disso, a expressão desse gene sempre foi maior no IAPAR59 que no RUBI MG 1192. Também, observou-se uma maior expressão desse gene no ano de 2008, quando comparada ao ano de 2009. Essa diferença poderia ser uma consequência direta dos níveis de estresse hídrico recebidos pelas plantas, já que as condições da seca em 2008 foram mais severas do que no ano de 2009. Assim,nesse trabalho, propõe-se o uso do gene CaM6PR como marcador molecular, para avaliar o nível de estresse das plantas cafeeiras submetidas ao déficit hídrico.Item Analysis of the mannose 6 phosphate reductase gene expression in coffee trees submitted to water deficit(Editora UFLA, 2013-01) Freire, Luciana Pereira; Marraccini, Pierre Roger; Rodrigues, Gustavo Costa; Andrade, Alan CarvalhoThe effects of water deficit on the gene CaM6PR expression, encoding mannose -6- phosphate reductase, were evaluated in coffee trees in the formation phase of coffee cultivars IAPAR59 (Villa Sarchi x Timor hybrid HT832 / 2) and RUBI MG 1192 (Mundo Novo x Catuaí) of Coffea arabica, respectively regarded as tolerant and sensitive to water stress. The cultivars were planted in December 2007 in the experimental field of Embrapa Cerrados - DF (CPAC) and cultured for two years (2008 and 2009) with (I) and without (NI) irrigation. For each year two assessments were carried out (P1 , not stressed, during the rainy season and P2 , dry season). For both cultivars, the CaM6PR gene expression measured in leaves through quantitative PCR, showed a strong increase in the dry season for non-irrigated plants when compared with irrigated plants. In addition, the expression of this gene was always greater in IAPAR59 than in RUBI MG 1192. Also, there was an increased expression of this gene in 2008 when compared to 2009. This difference could be a direct consequence of drought stress levels received by plants, since drought conditions in 2008 were more severe than in 2009. Thus, in this work, we propose the use of the CaM6PR gene as a molecular marker to evaluate the stress level of the coffee plants submitted to water deficit.