ResumoCom o objetivo de estudar o efeito de doses de nitrogênio (N) e potássio (K) no crescimento e acúmulo de nutrientes na parte aérea de mudas de aceroleira (Malpighia emarginata D.C), instalou-se um experimento em casa de vegetação na Universidade Federal de São João Del Rei-UFSJ em Sete Lagoas, MG, utilizando-se mudas oriundas do processo de estaquia. Utilizou-se o esquema fatorial 4 x 4, em delineamento de blocos casualizados, com três repetições e três plantas por parcela. Os fatores consistiram de quatro doses de N (0, 200, 400 e 600 mg dm -3 ) e quatro doses de K (0, 100, 200 e 300 mg dm -3 ). Aos 110 dias após o transplantio, as mudas foram avaliadas quanto ao comprimento de parte aérea e raiz, diâmetro do caule, número de folhas e Índice de Qualidade de Dickson, posteriormente foram colhidas, secas em estufa a 65 °C para a obtenção da matéria seca da parte aérea, raiz e total, sendo trituradas para a determinação da concentração de nutrientes. Foram determinadas as quantidades acumuladas de N, P, K, Ca, Mg, S, B, Cu, Zn, Fe e Mn na matéria seca da parte aérea. As doses isoladas de N e K influenciaram as variáveis de crescimento e aumentaram as quantidades acumuladas de P, K e Zn, sendo as quantidades acumuladas dos demais nutrientes afetadas apenas pelo N. O acúmulo dos nutrientes nas mudas seguiu a ordem decrescente N>Ca>Mg>P>S>K>Mn>B>Zn>Fe. Palavras-chave: Malpighia emarginata; nutrientes; qualidade de muda. Growth and accumulation of nutrients by barbados cherry seedlings in the function of the application of different doses of nitrogen and potassium ABSTRACTIn order to study the effect of nitrogen (N) and potassium (K) rates on the growth and nutrient accumulation of shoot shoots (Malpighia emarginata DC), an experiment was carried out under greenhouse conditions at Federal University of São João Del Rei-UFSJ in Sete Lagoas, MG, using seedlings from the cutting process. A 4 x 4 factorial scheme was used in a randomized complete block design with three replications and three plants per plot. The factors consisted of four doses of N (0, 200, 400 and 600 mg dm -3 ) and four doses of K (0, 100, 200 and 300 mg dm -3 ). At 110 days after transplanting, the seedlings were evaluated for root length, root diameter, stem number, leaf number and Dickson Quality Index, and were then harvested, oven dried at 65 ° C to obtain the material dry matter of the aerial part, root and total, being crushed for the determination of the concentration of nutrients. The accumulated amounts of N, P, K, Ca, Mg, S, B, Cu, Zn, Fe and Mn in the shoot dry matter were determined. The isolated doses of N and K influenced the growth variables and increased the accumulated amounts of P, K and Zn, the accumulated amounts of the other nutrients being affected only by N. The accumulation of nutrients in the seedlings followed the decreasing order N> Ca> Mg> P> S> K> Mn> B> Zn> Fe.

No abstract

No abstract

Jatropha curcas L. plant is adapted to diverse climatic conditions with high requirement of heat stroke and drought resistant, having a special position among the attractive crops to biofuel program. This species has been studied from the perspectives of plant breeding, biotechnology and development of production systems. However, there are few reports of research regarding its anatomical characteristics. Thus, the objective of this study was to evaluate the effects of different conditions of light and temperature on the germination in vitro of J. curcas embryo and describe the leaf structure of seedlings through anatomical and micromorphological parameters. Embryos were excised and cultured in test tubes containing 15 ml of MS medium and grown in different temperature (25 °C and 30 °C) and light conditions (white, red, far red, and absence of light). The cultures were kept in BOD germinators chambers, with a 16 h photoperiod. Phytotechnical, anatomical and micromorphological (via electron scanning microscopy) characteristics were measured. The species J. curcas has a higher germination speed index when grown at 30 ºC. There is an increased of number of normal seedlings in white light and this point characterizes the species as neutral photoblastic. J. curcas presents uniseriate epidermis, palisade unistratified parenchyma, and spongy parenchyma composed of irregular cells. It is an amphistomatic species, with more stomata on the abaxial surface.