Avaliação de caracteres quantitativos relacionados com o crescimento vegetativo entre cultivares de café arábica de porte baixo

Freitas, Zélia Maria Travassos Sarinho de; Oliveira, Francisco José de; Carvalho, Samuel Pereira de; Santos, Venézio Felipe dos; Santos, José Peroba de Oliveira

doi:10.1590/s0006-87052007000200010

Cited by 23 publications

(39 citation statements)

References 12 publications

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“…In this study, production traits showed a high genetic correlation with vegetative variables (Table 2), as with other perennial species, for example, açaí (Farias Neto et al, 2005) and coffee (Freitas et al, 2007;Martinez et al, 2007 It was possible to verify a high positive genetic correlation between PH and NB, NF, NS, SD, and PS ( Table 2).…”

Section: Genetic Correlations and Path Analysissupporting

confidence: 63%

Genetic diversity and selection gain in the physic nut (Jatropha curcas)

Brasileiro¹,

Silva²,

Souza³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. The use of efficient breeding methods depends on knowledge of genetic control of traits to be improved. We estimated genetic parameters, selection gain, and genetic diversity in physic nut half-sib families, in order to provide information for breeding programs of this important biofuel species. The progeny test included 20 halfsib families in 4 blocks and 10 plants per plot. The mean progeny heritability values were: 50% for number of bunches, 47% for number of fruits, 35% for number of seeds, 6% for stem diameter, 26% for number of primary branches, 14% for number of secondary branches, 66% for plant height, and 25% for survival of the plants, demonstrating good potential for early selection in plant height, number of branches, and number of fruits per plant. In the analysis of genetic diversity, genotypes were divided into 4 groups. Genotypes 18, 19, 20, and 8 clustered together and presented the highest means for the vegetative characters and production. Lower means were observed in the 17, 12, 13, and 9 genotypes from the same group. We detected genetic variability in this population, with high heritability estimates and accuracy, demonstrating the possibility of obtaining genetic gains for vegetative characters and production at 24 months after planting.

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Section: Genetic Correlations and Path Analysissupporting

confidence: 63%

Genetic diversity and selection gain in the physic nut (Jatropha curcas)

Brasileiro¹,

Silva²,

Souza³

et al. 2013

Genet. Mol. Res.

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“…The increased thickness of the stem is a desirable feature, as well as giving support to the mechanical room , a higher stem thickening can meet the increased need for transport of sap that feeds this room (Freitas, Oliveira, Carvalho, Santos, & Santos, 2007).…”

Section: Resultsmentioning

confidence: 99%

<b>The production of <i>Physalis</i> spp. seedlings grown under different-colored shade nets

et al. 2016

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ABSTRACT. The objective of this study was to evaluate the production of seedlings of Physalis L. species under different-colored shade nets. Four shade nets individually stained white, blue, red and black, all with 50% shading, were used in this study, and an additional treatment (control) was used in which seedlings were grown in full sun. The study examined four species of Physalis, namely, P. peruviana, P. pubescens, P. minima and P. ixocarpa. The experiment followed a randomized block design with three blocks and 25 seeds per plot. The species were sown in styrofoam trays. Germination was monitored daily to calculate the Emergency Velocity Index (EVI) and stabilize the overall percentage of emergence. Height, stem diameter, number of leaves, leaf area index and dry mass of seedlings were assessed at 50 days after sowing. The study found that these species react differently to changes in the light spectrum. Seedlings of P. peruviana should be grown under a white or red shade net; of P. pubescens under a white or black shade net; of P. minima under a white, red or black shade net; and of P. ixocarpa under a white shade net. For all species, 50% shade should be used.Keywords: Physalis L., sexual propagation, seedling morphology, light spectrum. Produção de mudas de espécies de Physalis cultivadas sob diferentes colorações de telas fotoconversorasRESUMO. Objetivou-se com o presente trabalho, avaliar a produção de mudas de espécies pertencentes ao gênero Physalis L. sob telas fotoconversoras de diferentes colorações. Foram utilizadas quatro telas fotoconversoras, nas colorações branca, azul, vermelha e preta, todas com 50% de sombreamento, além de um tratamento a pleno sol (controle), e quatro espécies de Physalis: P. peruviana, P. pubescens, P. minima e P. ixocarpa. O delineamento experimental foi de blocos ao acaso contendo três blocos com 25 sementes em cada tratamento por parcela experimental. As espécies foram semeadas em bandejas de isopor. Acompanhou-se a germinação diariamente, para cálculo do Índice de velocidade de germinação (IVE) e ao estabilizar, calculou-se a porcentagem total de emergência. Aos 50 dias avaliou-se, altura, diâmetro do colo, número de folhas, índice de área foliar e massa seca das mudas. Concluiu-se que as espécies estudadas reagem de forma diferente à modificação do espectro luminoso. Mudas de P. peruviana devem ser formadas sob telado branco ou vermelho, de P. pubescens sob telado branco ou preto, de P. minima em telado branco, vermelho ou preto e de P. ixocarpa sob telado branco, com 50% de sombreamento.Palavras-chave: Physalis L., propagação sexuada, morfologia de mudas, espectro luminoso.

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“…44, 169.83, 173.41, 167.41, 164.22 and 176.10% for E1, E2, E3, E4, E5 and E6 respectively. Stem diameter is one of the vegetation attributes that most contribute to productivity in the coffee plant (CARVALHO et al, 2010;FREITAS et al, 2007). It is therefore likely that the levels of fertilization which provided maximum stem diameter in the plants for each period are located close to the ideal level of fertilization for coffee productivity.…”

Section: Resultsmentioning

confidence: 99%

Critical ranges for leaf nitrogen and potassium levels in coffee fertigated at the production phase1

Assis¹,

Guimarães²,

Colombo³

et al. 2015

Rev. Ciênc. Agron.

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-With the aim of establishing critical ranges for the leaf nitrogen (N) and potassium (K) levels in fertigated coffee crops under production, an experiment was carried out in the experimental area of the Sector for Coffee Cultivation of the Department of Agriculture at the Federal University of Lavras, in Brazil. Treatments consisted of five levels of fertilizer applied through fertigation: 30%, 80%, 130%, 180% and 230% of the recommended amounts of N and K for rainfed coffee grown in Minas Gerais. A randomised block design with four replications was used. Critical ranges for nutrient concentrations in the leaves were established from the results of growth characteristics (plant height and stem diameter), leaf analyses and productivity. The results obtained were: a) nitrogen (g kg -1): 32

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Avaliação de caracteres quantitativos relacionados com o crescimento vegetativo entre cultivares de café arábica de porte baixo

Cited by 23 publications

References 12 publications

Genetic diversity and selection gain in the physic nut (Jatropha curcas)

Genetic diversity and selection gain in the physic nut (Jatropha curcas)

<b>The production of <i>Physalis</i> spp. seedlings grown under different-colored shade nets

Critical ranges for leaf nitrogen and potassium levels in coffee fertigated at the production phase1

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