Time filter

Source Type

Canoinhas, Brazil

da Silva G.O.,Embrapa Hortalicas SNT | Castro C.M.,Embrapa Clima Temperado | Terres L.R.,Embrapa Clima Temperado | Rohr A.,Embrapa Clima Temperado | And 2 more authors.
Horticultura Brasileira | Year: 2012

The aim of this work was to verify the growth cycle, yield components and specific gravity of advanced potato clones as compared to the main varieties grown in Brazil. The experiment was carried on at the Embrapa Clima Temperado experimental field, in Pelotas, Rio Grande do Sul state, Brazil. Eight advanced potato clones developed by the Embrapa Potato Breeding Program, and two commercial cultivars were evaluated in the autumn season of 2011. A randomized complete block design with four replications was used, the plots being constituted by a line of 20 plants. Growth cycle was assessed 95 days after planting. Plants of each plot were harvested at 110 days, followed by evaluation of yield components and specific gravity. After checking for normality of error distribution, the data were submitted to analysis of variance and to means grouping by the Scott & Knott test. CL02-05, CL69-05, CL27-05 and 2197-15 clones showed higher commercial tuber number, percentage of commercial tubers and average tuber weight than the check varieties. CL02-05 clone showed, besides, the highest yield potential of commercial tubers of all four clones. CL69-05 and 2197-15 presented specific gravity and growth cycle similar to Asterix, but had higher yield potential and larger tuber size than it. Source

Onoyama S.S.,Embrapa Hortalicas | da Silva G.O.,Embrapa Hortalicas SNT | Moita A.W.,Embrapa Hortalicas | Vieira J.V.,Embrapa Hortalicas | And 2 more authors.
Horticultura Brasileira | Year: 2011

The present investigation aimed at elucidating the carrot attributes which stake holders view as the most important. A research was carried out with carrot growers, seed companies, supplier salespersons, washers, food processors, wholesalers and supermarket managers and was compared to the perception of consumers from supermarkets located in the Federal District of Brazil. Data sets were collected through structured interviews with closed questions about the importance of a range of attributes on a 1 (not important) to 5 (very important) scale. Statistic method based on categorical analysis was used to rank the attributes and calculate the average contrasts. The survey indicated that, according to consumers, nutritional value, texture, external color and taste are the most important attributes. In contrast, the other stake holders pay more attention to characteristics related to shape uniformity, external color and green shoulder. In addition, differences of perception by specific chain agents were detected, in special to the consumers group, affected by gender, age, educational level, marital status and supermarket location. These results are very important for directing carrot research projects, which must meet the productive sector and consumers requirements. Source

da Silva G.O.,Embrapa Hortalicas SNT | Pinheiro J.B.,Embrapa Hortalicas | Vieira J.V.,Embrapa Hortalicas | de Carvalho A.D.F.,Embrapa Hortalicas
Horticultura Brasileira | Year: 2011

We verified the relation among the evaluated characters in field and greenhouse, concerning to the evaluation to root-knot nematode (Meloidogyne spp.) for the carrot crop, to identify for which ones it is possible to differentiate among genotypes and to verify the possibility of evaluation only in one environment or the elimination of characters with high correlation. Thirty eight and thirty one families from the carrot populations '0812518' and '0812519', and the cultivars Brasília and Kuronan as tolerant and susceptible standards, respectively, were evaluated. In a field whose soil was naturally infected by a mix of Meloidogyne incognita race 1 and Meloidogyne javanica, the selection to resistance to root-knot nematode was based on lower percentage of infection in the root, of the major genotypes of carrot production in t/ha and reproduction factor; and in greenhouse, to each one of the same nematode species and too for a mix of both, was evaluated the index of gall and index of egg mass. There is no possibility of selection in only one condition or the elimination of some characters, indicating that, to obtain more yielding and more tolerant cultivars, the combined selection in the various characters and environments are necessary. In the field experiment, it was only possible to differentiate the genotypes for root yield. In the greenhouse, it was possible to identify superior genotypes for all characters tested. However, the average population was not better than the 'Brasilia' standard that originated these populations. This result confirms the necessity to search for more efficient methods of selection. Source

da Silva G.O.,Embrapa Hortalicas SNT | de Carvalho A.D.F.,Embrapa Hortalicas | Vieira J.V.,Embrapa Hortalicas | Fritsche-Neto R.,Federal University of Vicosa
Horticultura Brasileira | Year: 2012

In the process of developing new cultivars, it is imperative to know the performance of carrot populations in final breeding phase for the possible environments to which they may be indicated; this can be verified testing the adaptability and stability. In this study the adaptability and stability of carrot genotypes from the Brasilia group were verified. The experiment was carried out during the 2007/2008, 2008/2009 and 2009/2010 crop years at five different places, three being in conventional growing at Sao Gotardo (Minas Gerais state), Irece (Bahia state) and Gama (Federal District), and two in organic growing at Managed Settlement Program of the Federal District (PAD-DF) and Gama. A randomized block design with three replications with 1 m2 plots was used. Four carrot genotypes from the Brasilia group: 0912532, 0912520, BRS Planalto and Brasilia were evaluated. 100 days following sowing, fresh mass of commercial root value was determined in grams, in each plot. Regarding adaptability and stability assessment, the REML/BLUP methodology was applied. BRS Planalto and 0912520 were the genotypes with better adaptability and stability; BRS Planalto was preeminent mainly in 2009-2010 crop years; and 0912520 was preeminent in 2007/2008 and 2008/2009. Brasilia had the worst performance in most places, but good performance and specific adaptability to Irece. Source

da Silva G.O.,Embrapa Hortalicas SNT | Vieira J.V.,Embrapa Hortalicas | de Carvalho A.D.F.,Embrapa Hortalicas | Boiteux L.S.,Embrapa Hortalicas
Horticultura Brasileira | Year: 2013

The amount of information about multiple phenotypic effects of the selection for single root traits is yet limited in carrot. Thus, the objectives of the present work were: (1) verify the possibility of using the direct effects of the path analysis to estimate correlated gains; (2) identify the best strategy to obtain correlated gains for root mass; (3) determine which root tissue would allow the highest gains aiming to increase the root diameter; and, (4) verify the possibility of having gains for root color in conjunction with other evaluated traits. Tree carrot populations (derived from the cv. Brasília) were cultivated during the summer in Brasília, Federal District, Brazil. Twenty-five roots were harvested (90 days after sowing) in each plot and the root mass, root length, root diameter, diameter of root xylem; phloem width, and the chromaticity values a* of the xylem and phloem were evaluated individually. Analysis of variance was carried out with information from within and among populations. The genetic correlations among this set of traits were also calculated. Path analysis was carried out and the correlated response (based upon the genetic correlation) was estimated. The direct effects of the path analysis and the direct gains from selection were also determined. The replacement of the genetic correlations with the direct effects of the path analysis was found to be the best procedure to estimate the single trait selection effect on the other traits after removing the indirect effects. Selection for larger root mass did not show correlated gains for the other evaluated traits. Selection for larger root diameter would result in the largest correlated gain for root phloem thickness. The selection for highest a* value of the xylem would result in a decrease in the xylem diameter. However, the direct selection for highest a* value and larger xylem diameter could result in positive gains to both traits. Source

Discover hidden collaborations