Wagner Nunes Rodrigues

Eficiência de absorção e utilização de boro, zinco, cobre e manganês em mudas enxertadas de cafeeiro

Efficiency of absorption and utilization of boron, zinc, copper and manganese in grafted coffee seedlings Studying nutritional efficiency of grafted coffee plants is important for the selection of graft/ rootstock combinations, aiming to achieve better plant development and yield. The objective of this work was to evaluate the genetic differences for B, Zn, Cu and Mn absorption and utilization efficiencies of grafted coffee seedlings. The experiment was conducted with seedlings planted in 20 L pots with a substrate consisting of soil, sand, and manure in the proportion of 3:1:1, in which they kept for 18 months, until harvest. Four genotypes of Coffea arabica L. were used as grafts: cultivars Catuai Vermelho IAC 15 (‘Catuai 15) and Oeiras MG 6851 (‘Oeiras’), and hybrids H419-10-3-4-4 (‘H419’) and H514-5-5-3 (‘H514’). All genotypes were obtained from the EPAMIG/UFV breeding program. Five half-sibling progenies of clones of Coffea canephora Pierre ex Froenher cv. Conilon were used as rootstocks: ‘ES 21’, ‘ES 36’, ‘ES 26’, ‘ES 23’ and ‘ES

Influence of pre-germination treatments and temperature on the germination of crambe seeds (Crambe abyssinica Hochst)

The objective of this study was to evaluate the influence of pre-germination treatments and temperature on the germination of crambe seed (Crambe abyssinica Hochst). The completely randomized design was used in a 3 x 3 x 2 factorial (physical treatments x chemical treatments x temperature). The chemical treatments consisted of paper soaked in gibberellic acid (GA3), potassium nitrate (KNO3) and water. The physical treatments consisted of maintaining the seed intact, mechanical scarification and seed coat removal. Temperatures of 25 and 30 °C were used in the completely randomized design. The variables studied were germination speed index, germination percentage, seed length and seedling dry mass. In the studied conditions, the percentage and rate of germination, length and seedling dry weight of seeds of C. abyssinica Hochst were enhanced by removal of the integument, in soaking with GA3 at 25 °C.

Selection of genotypes of Jatropha curcas L. for aluminium tolerance using the solution-paper method

espanolEl objetivo de la investigacion fue evaluar el efecto de la concentracion del aluminio en solucion que mejor diferencia la tolerancia al aluminio en genotipos de Jatropha, utilizando el metodo papel-solucion. Semillas de cuatro genotipos diferentes de Jatropha (CNPAE-248, CNPAE-301,CNPAE-308 y CNPAE-144) fueron germinadas en diferentes concentraciones de Al (0, 15, 40, 80 y 120 mg L�1) usando la tecnica de papel-solucion. Despues de 14 dias se midio el tamano de la raiz primaria en todos los tratamientos. Los resultados aqui presentados muestran que hay un comportamiento diferente de los genotipos para la tolerancia donde el tamano de la raiz primaria de estos disminuye exponencialmente en relacion con el aumento de los niveles de Al. El metodo de papel-solucion permite la seleccion de los genotipos de Jatropha en relacion con la tolerancia al aluminio; recomienda utilizar la concentracion de 40 mg L�1 de Al para discriminar diferencias en la tolerancia a este elemento EnglishThe study objective was to determinate the concentration of aluminum that allow to distinguish genotypes of Jatropha for tolerance to this element, using the solution-paper method. For this study, seeds of four genotypes of Jatropha, were germinated at different Al concentrations (0, 15, 40, 80 and 120 mg L�1). After 14 days, the root length was measured for all treatments. It was observed that there are different tolerance levels for the genotypes. The root length decreased exponentially with the increase of the Al concentration. The solution-paper method allows the selection of genotypes of Jatropha in relation to aluminum tolerance and the concentration of 40 mg L�1 of Al is recommended to discriminate the tolerance of genotypes to this element

Crop yield bienniality in groups of genotypes of conilon coffee

]Programa de Pos-Graduacao em Producao Vegetal, Centro de Ciencias Agrarias da Universidade Federal do Espirito Santo, CCA-UFES, Alto Universitario, Cx. P. 16, CEP: 29500-000, Alegre, Espirito Santo, Brazil. 2Departamento de Producao Vegetal, Centro de Ciencias Agrarias da Universidade Federal do Espirito Santo, CCA-UFES, Alto Universitario, Cx. P. 16, CEP: 29500-000, Alegre, Espirito Santo, Brazil. 3Instituto Capixaba de Pesquisa, Assistencia Tecnica e Extensao Rural, INCAPER, Rua Afonso Sarlo, 160, Bento Fereira, CEP: 29052-010, Vitoria, Espirito Santo, Brazil. 4Empresa Brasileira de Pesquisa Agropecuaria, EMBRAPA CAFE/INCAPER, Parque Estacao Biologica, PqEB, s/n, CEP: 70770-901, Brasilia, Brazil.

Differences between genotypes of Jatropha curcas L. are evidenced for absorption and use of nitrogen

The objective of this study was to quantify the nutritional efficiency and responsiveness in relation to nitrogen of twelve genotypes of physic nut (Jatropha curcas L.) grown in soil without nitrogen supply and also with three levels of fertilization in a controlled environment. The experiment was conducted in factorial scheme 12×4 with four replications, the factors being: 12 genotypes of physic nut and four levels of nitrogen fertilization, studied in a randomized design. The plants were grown in pots, without restrictions, for 100 days and their dry matter and N contents were evaluated (for roots, leaves and total). Subsequently, the efficiency ratios for absorption, translocation, use and responsiveness in relation to the N supply were calculated. Overall, the nutritional efficiencies for nitrogen increase linearly with the increase of nitrogen supply in the soil. The genotypes CNPAE 161-II, CNPAE 167-II, CNPAE 180-I, CNPAE 255-I and CNPAE 300-I were classified as efficient and responsive to nitrogen fertilization being highlighted for plant breeding programs aiming to improve this agronomic trait

Aluminum stress in Crambe abyssinica Hochst

espanolCrambe es una especie sensible al aluminio intercambiable que requiere suelos bien fertilizados y corregidos. El objetivo de este trabajo fue evaluar distintas concentraciones de aluminio en la germinacion y desarrollo de crambe. El experimento para germinacion se realizo con un diseno de bloques completos al azar con arreglo factorial de 5x2, con cuatro repeticiones. Las cinco concentraciones de Al3+ fueron 0, 15, 40, 80 y 120 mg dm-3 y las temperaturas de 20 y 30° C. El experimento para desarrollo de la planta se realizo con un diseno de bloques completos al azar con cinco concentraciones de Al3+ y cuatro repeticiones. Los parametros evaluados fueron porcentaje de germinacion, crecimiento de las plantulas y biomasa. Se analizo la tasa relativa de crecimiento, altura de planta, numero de hojas, area foliar total, area foliar especifica, materia seca en cada compartimento de la planta (raiz, tallo y hojas), razon de area foliar, razon de masa de raiz, tallo y hojas. El porcentaje de germinacion aumento a los 2 °C. La mayor concentracion de aluminio afecto el crecimiento, produccion de materia seca y desarrollo de hojas. Estos resultados sugieren que el cramble es sensible al aluminio intercambiable. EnglishCrambe is a sensitive specie to exchangeable aluminum, it require a well-fertilized and corrected soil. The objective of this study was to understand the impact of aluminum presence, in different concentrations, in the substrate on the germination and development of crambe. The experiment was carried out as a randomized complete block design with a 5x2 factorial arrangement in four replicates. The five concentrations of Al3+ were 0, 15, 40, 80 and 120 mg dm-3 Al3+ and two temperatures (20 and 30 °C), with four replications. The relative growth rate, plant height, leaf number, total leaf area, specific leaf area, dry matter in each plant compartment (root, stem and leaf), leaf area ratio, stem mass ratio and leaf mass ratio were evaluate. Germination was favored by 20 oC. The limitation on plant growth was greater as the concentration of aluminum increased, presenting losses in growth, as well of production of dry matter and leaf development, also causing changes in the patterns of biomass allocation between the plant compartments.

Characterization of the Essential Oil of Mastic Tree from Different Biomes and its Phytotoxic Potential on Cobbler’s Pegs

Abstract Schinus terebinthifolius Raddi, popularly known as mastic tree, presents a known healing, anti-inflammatory and antiseptic activities. The study of others biological activities of mastic tree may help to develop natural products less harmful to humans and nature. Thus, the present study aimed to characterize and investigate the activity of the essential oil from fresh leaves of this species, collected in biomes of cerrado and Atlantic Forest of Minas Gerais (Brazil), over the germination of cobbler’s pegs (Bidens pilosa L.). The chemical composition of essential oil varied depending on the biome where the leaves were collected. The major compounds found in the essential oil of mastic tree from Cerrado were trans-caryophyllene (21.9%) and δ-3-carene (18.0%). While the α-pinene (62.9%) and limonene (19.1%) were the major components found in the essential oil of mastic tree collected in the Atlantic Forest. The essential oils showed phytotoxic activity on the development of cobbler’s pegs, there was inhibition of germination, root growth, hypocotyl growth and biomass production, and its effects was higher as the concentration of the oils increased (0.05 w v-1).