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De Oliveira N.N.S.,Federal University of Lavras | Viana A.P.,UENF CCTA LMGV | Paiva C.L.,Campos do Goytacazes | Marinho C.S.,UENF CCTA LMGV
Revista Brasileira de Fruticultura | Year: 2014

The objective of this study was to evaluate the genetic distance among 37 accessions of cultivated species Psidium guajava, L. (guava) and Araçás to the genus Psidium to the germplasm colection of the Universidade Estadual Norte Fluminense (UENF) by ISSR molecular markers. In the 17 selected markers, 216 polymorphic bands were obtained. By UPGMA method there was the formation of five main clusters. Accessions of araçá species, P. cattleyanum Sabine, were allocated in groups I and II. In group II was observed within the species P cattleyanum, closer to the guava. In group III was allocated the genotypes of the species P. guineense Sw (araçá-do-campo) and among the araçás, was the most closest to the guava. The guava genotypes were allocated to Group IV and V, confirming their high divergence. Molecular markers were efficient in evaluating intra and interspecific genetic distance for these species. © 2014, Sociedade Brasileira de Fruticultura. All rights reserved.

Campos B.M.,UENF CCTA LMGV | Viana A.P.,UENF CCTA LMGV | Quintal S.S.R.,UENF CCTA LMGV | Barbosa C.D.,Federal University of Fluminense | Daher R.F.,UENF CCTA LMGV
Revista Brasileira de Fruticultura | Year: 2016

The present study aimed at evaluating the heterotic group formation in guava based on quantitative descriptors and using artificial neural network (ANN). For such, we evaluated eight quantitative descriptors. Large genetic variability was found for the eight quantitative traits in the 138 genotypes of guava. The artificial neural network technique determined that the optimal number of groups was three. The grouping consistency was determined by linear discriminant analysis, which obtained classification percentage of the groups, with a value of 86 %. It was concluded that the artificial neural network method is effective to detect genetic divergence and heterotic group formation. © 2016, Sociedade Brasileira de Fruticultura. All rights reserved.

Protocols for the micropropagation of pineapple cv. Vitória and cv. IAC Fantástico were optimized, as well as the photosynthetic and growth responses of these genotypes in response to changing the in vitro environment. For the two cultivars, treatments were arranged in a completely randomized design, with six repetitions and five plants per repetition, in a sub plots subdivided, made up of light qualities (white and red), types of culture vessels (closed and ventilated) and sucrose concentrations in the growth medium (15 and 30 g L-1). The evaluation was made after 40 days of in vitro culture. Under the conditions of this study there was no photosynthetic carbon assimilation. This non-assimilation was associated with biochemical compromises rather than photochemical efficiency. The presence of sucrose should be the factor responsible for non-CO2 assimilation. The cv. Vitória showed higher growth than the cv. IAC Fantástico due to the higher carbon absorption via sucrose. © 2014, Sociedade Brasileira de Fruticultura. All rights reserved.

Oliveira R.D.S.,UENF CCTA LFIT | Pereira M.R.,UENF CCTA LFIT | Carvalho V.S.,UENF CCTA LFIT | Da Silva J.R.,UENF CCTA LMGV | Campostrini E.,UENF CCTA LMGV
Revista Brasileira de Fruticultura | Year: 2015

The objective of this study was to evaluate the efficiency of chemical sterilization of the culture medium and alternative gelling agents and their influence on development in vitro and ex vitro plants of pineapple ‘Vitória’. The culture medium used was composed of MS salts and White vitamins, with 30 g L-1 of sucrose and 100 mg L-1 of myo-inositol. Two forms of sterilization of the media culture and the glassware were performed: in autoclave at 121°C and with solution of sodium hypochlorite (NaClO) at 0.003% to rinse the glassware and 0.0003% in the culture medium. The gelling agents tested were: M1: agar (6.0 g L-1); M2: corn starch (60.0 g L-1); M3: agar (3.0 g L-1) + corn starch (30.0 g L-1) and M4: agar (3.0 g L-1) + cassava starch (30.0 g L-1). After 30 days of in vitro cultivation was found that the NaClO and alternative gelling agents did not affect the growth and development of plantlets. Part of the plantlets of each treatment was acclimatized during 90 days, after which it was found that there was no influence of gelling agents on plantlets growth. For most of the parameters evaluated, the plantlets derived from treatments involving the chemical sterilization showed results similar or superior to the autoclaved media. © 2015, Sociedade Brasileira de Fruticultura. All rights reserved.

de Oliveira Pessanha P.G.,UENF CCTA LMGV | Viana A.P.,UENF CCTA LMGV | de Carvalho A.J.C.,UENF CCTA LMGV | de Oliveira J.G.,UENF CCTA LMGV
Revista Caatinga | Year: 2011

The objective of this study was to characterize the level of mineral nutrients N, P, K, Ca, Mg, S, Mn, Fe, Zn, Cu, Mo and B of twelve genotypes of grapevine: 'Italy', 'Ruby', 'Patricia', 'Isabel', 'Redglobe', 'Roberta', 'Kyoho', 'Romana', 'Rosalinda', 'Moscatel de Hamburgo,' 'Niagara Rosada' and 'UFV 01' in the North Fluminense. Was held on pruning, followed by fertilization and conventional analysis of leaf blade in three moments of the reproductive cycle of the vine: In full bloom, berries and peas at the stage between half and beginning of berry ripening of berries (veraison). Following results were obtained for all moments sampled: Normal levels of N, K, P, Mg, Fe, B and Zn and subnormal levels of Ca. The study demonstrated that the leaf blade sampled reflects the nutritional stage of grapevine genotypes.

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