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da Silva G.O.,Embrapa Hortalicas SPM | Ney V.G.,Federal University of Pelotas | Terres L.R.,Federal University of Pelotas | Pereira A.S.,Embrapa Clima Temperado | Suinaga F.A.,Embrapa Hortalicas
Revista Ceres | Year: 2013

The objective of this work was to estimate the general and specific combining ability of potato parents in early generation of selection. The experiments were carried out at the municipality of Pelotas and Canoinhas. Twelve potato families derived from two groups of parents crossed in a 3 × 4 partial mating design were studied: 'Eliza', 'C-1730-7-94', 'C-1742-8-95' and 'Shepody', 'Asterix', 'White Lady', 'Caesar'. The families were evaluated at the seedling stage and in the first field generation for tuber appearance traits and tuber yield traits. The data were submitted to variance analysis, and partial diallel analysis. In the set of traits there was superiority of significant effects for general combining ability in relation to specific combining ability. This suggests a predominance of additive effects of the genes in the control of these traits. Regarding the general combining ability, 'White Lady' is the most prominent parent, contributing with genes of additive action for the improvement of tuber appearance traits and yield traits. As for the specific combining ability, the cross 'C1730-7-94' x 'White Lady' is the most suitable for the generation of superior families for tuber appearance traits and yield traits.


da Silva G.O.,Embrapa Hortalicas SPM | Pereira A.S.,Embrapa Clima Temperado | Suinaga F.A.,Embrapa Hortalicas | Ponijaleki R.,Embrapa Produtos e Mercado
Horticultura Brasileira | Year: 2013

The objective of this study was to identify the best time of desiccation of plants to promote skin quality without detriment of potato cultivar BRS Clara. The experiment was carried out at Embrapa Produtos e Mercado, Canoinhas, Santa Catarina state, Brazil. 'Agata' was used as the control cultivar. The treatments were four desiccation times (90, 95, 100, and 105 days after planting), in spring season. The experimental design was randomized blocks with four replications. Each plot consisted of four rows of ten plants each. Ten days after desiccation of plants, the two internal rows of each plot were harvested and the tubers evaluated for yield component, skin roughness, and tone coloration of tuber skin. The data were submitted to analysis of variance and regression. For BRS Clara, a desiccation of the plants should be done earlier to avoid losses in quality of the skin, especially in relation to the roughness of the tubers. The maximum date for desiccation was 100 days after planting of tubers to obtain tubers with skin quality and no further reduction in yield of tubers. For the control cultivar Agata, that presented better tuber appearance than BRS Clara, but lower yield, delaying the desiccation date up to 100 days of planting also seems appropriate, but not due to loss of quality of the skin, but by having reached the maximum yield.


Silva G.O.,Embrapa Hortalicas SPM | Pereira A.S.,Embrapa Clima Temperado | Suinaga F.A.,Embrapa Hortalicas | Carvalho A.D.F.,Embrapa Hortalicas
Horticultura Brasileira | Year: 2014

The aim of this work was to verify the performance of seven advanced potato clones in relation to yield components, compared to varieties grown in large scale in Brazil. The experiment was carried out in the experimental feld of Embrapa Produtos e Mercado, Canoinhas, Santa Catarina state, Brazil. Seven advanced potato clones developed in Embrapa Potato Breeding Program, and two commercial cultivars (Agata and Asterix) were evaluated in the spring season of 2012. A randomized complete block design with four replications of 10 plants per plot was used. Plants of each plot were harvested 110 days after planting, and evaluated for yield components. The data were submitted to analysis of variance, grouping means by the Scott & Knott test and phenotypic correlation. Except F22-08-01, all clones exceeded the control cultivars for yield trait components, mainly the clones F74-08-09 and F17-08-01. The total tuber yield was mainly determined by the average tuber mass and little infuenced by the total number of tubers per plant, while marketable tuber mass was similarly determined by the marketable tuber number and average tuber weight.


da Silva G.O.,Embrapa Hortalicas SPM | Suinaga F.A.,Embrapa Hortalicas | Ponijaleki R.,Embrapa Produtos e Mercado | Amaro G.B.,Embrapa Hortalicas
Revista Ceres | Year: 2015

In Brazil, the average yield of sweet potato is consistently below the potential of the crop due to the cultivation of local varieties and unimproved genotypes. Increase in yield is achieved by the adoption of appropriate cultural practices and use of more productive cultivars. Thus, the aim of this study was to evaluate the performance of root yield traits in sweet potato cultivars. Six sweet potato cultivars were evaluated: Princesa, BRS Amelia, BRS Cuia, Brazlândia Roxa, Beauregard and BRS Rubissol in an experiment conducted in Canoinhas-SC. These cultivars were planted in the field, in the agricultural years 2012 and 2013, in a randomized block design with three replications and plots consisting of 11 plants. At 150 days after planting, the plants were harvested and the root yield components were evaluated. In general, the cultivars assessed in this study are good choices for sweet potato growers, with yields greater than the country's average. Cultivars Beauregard and BRS Rubissol showed the best results for the traits related to root yield. Cultivars Princesa, BRS Amelia and BRS Cuia showed intermediate performance for commercial roots, especially in the second year of the assessment. The cultivar Brazlândia Roxa had the worst performance for yield root characters at 150 days after planting, which was probably due to its longer cycle.


The market demand for uniformity and productivity of commercial carrot roots has prioritized hybrid materials instead of open pollinated varieties. In this sense, the objective of this study was to estimate the ability of combining carrot progenitors for the characters root yield and tolerance to leaf blight. The experiments were carried out at Gama-DF, during the 2012-13 and 2013-14 season. Thirty-three carrot hybrids, originated from crosses among three male-sterile populations and 11 male-fertile S2 lines from tropical origin were assessed. At 90 days after sowing, the incidence of leaf blight disease was evaluated in the plots. At 100 days after sowing, the plants were harvested and root yield characters were evaluated. The analysis of variance was performed and the effects of general combining ability (GCA) and specific combining ability (SCA) were estimated. It was verified that both additive and non-additive genes are important to express characters of root yield and leaf blight tolerance. The male-sterile progenitors with higher general combining ability for root yield are the LM-649 and LM-650 lines, and among the male-fertile, the LM-555-2 line is the highest. The best hybrids for root yield and tolerance to leaf blight are LM-649 × LM-555-11-1, LM-650 × LM-555-7-1 and LM-650 × LM-554-8-1.

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