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Search Results: 1 - 10 of 34885 matches for " Antonio Ismael;Hoffmann "
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Repetibilidade e número de colheitas para sele??o de clones de cana-de-a?úcar
Ferreira, Adésio;Barbosa, Márcio Henrique Pereira;Cruz, Cosme Dami?o;Hoffmann, Hermann Paulo;Vieira, Marcos Antonio Sanches;Bassinello, Antonio Ismael;Silva, Marcia Flores da;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000800005
Abstract: this work aimed at the establishment of the repeatability coefficients (r), determination of the predictability degree (r2) and the needed measurement numbers for tons of cane per hectare, percentage of pol (sucrose) in the juice of cane and tons of pol in the juice of cane per hectare in sugarcane genotypes. a randomized block experimental design, with three replicates in four experiments and four replicates in the other experiments was used. the repeatability estimates were obtained by the statistical methods: anova; main components based on correlation matrix; and structural analysis (correlation, average r). the estimates of the repeatability coefficients showed values with very similar magnitude. the general average repeatability for those three traits was above 0.60, therefore showing regularity in the genotype performance at several measurements (cuts) and reliability in the genotype discrimination that was higher than 87%. the results showed that for those three traits there is a need for the use of, at least, three cuts so that the selection can be accomplished with predictability of a real value above 80% for the genotype.
RB965902 and RB965917 Early/medium maturing sugarcane varieties
Carneiro, Monalisa Sampaio;Rosa, Jo?o Ricardo Bachega Feijó;Barreto, Fernanda Zatti;Balsalobre, Thiago Willian Almeida;Chapola, Roberto Giacomini;Vieira, Marcos Antonio Sanches;Bassinello, Antonio Ismael;Hoffmann, Hermann Paulo;
Crop Breeding and Applied Biotechnology , 2011, DOI: 10.1590/S1984-70332011000300012
Abstract: the varieties rb965902 and rb965917 were developed for harvesting at the beginning to the middle of the sucrose extraction period (early/medium maturity) and released for the south-central region of brazil. in specific environments, the tons of pol per area (sucrose yield) of these varieties is higher than of the commercial standard rb855453 and they are resistant to the main diseases of the crop.
Sele??o recorrente para produtividade e qualidade de frutos em abobrinha braquítica
Cardoso, Antonio Ismael Inácio;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000200003
Abstract: since squash (cucurbita moschata) usually does not have inbreeding depression, recurrent selection may be an adequate method for squash breeding. in this study the recurrent selection efficiency was evaluated in squash, cultivar piramoita, aiming to improving fruit yield and quality. three generations were produced out of cultivar piramoita (population p0), with evaluation and selection of s1 progenies. in all selection cycles, experiments were set up in randomized blocks design, with five plants per plot, with cultivar piramoita as control. spacing was 2.0 x 1.0 m. after each cycle, the remaining seeds of selected progenies were used in the following cycle of recombination, and each progeny was represented, on average, by ten random plants. the four populations (p0, pi, pii and piii) were evaluated in randomized blocks design, with eight replicates and five-plant plots. number and weight of total and commercial (straight fruits, with long neck and without visible defects) fruits per plant and the rate of commercial fruits were evaluated. variance and regression analysis was performed and indicated a linear increase in yield due to selection cycles. in population piii, total (17) and commercial (11) fruit number plant-1, and total (3.7) and commercial (2.6 kg) weight of fruits plant-1, overcame initial population in 32; 63; 24, and 57%, respectively. these differences correspond to an increase larger than 11 t ha-1 or more than 36000 fruits ha-1 in only three recurrent selection cycles.
Dialelo entre linhagens de uma popula??o de pepino do tipo 'Caipira'
Cardoso, Antonio Ismael Inácio;
Horticultura Brasileira , 2006, DOI: 10.1590/S0102-05362006000200029
Abstract: the objective of this work was to evaluate general and specific combining ability of six 'caipira' cucumber lines, hybridized in a diallel cross, totalizing 15 experimental hybrids (h-1 to h-15), without reciprocals. the experimental design was randomized blocks with 23 treatments (6 lines, 15 experimental hybrids and two commercial hybrids: 'safira' and 'guarani'), four replicates and 5 plants per plot. the following characteristics were evaluated: total fruit number and weight per plant, commercial fruit number and weight per plant and rate of commercial fruits. hybrid h-5 showed the highest heterosis for fruit yield (45 to 51%), and had commercial yield (fruit number per plant) superior to five lines and to 'safira' hybrid. additive and non additive effects were significant for fruit yield (number and weight) per plant, resulting in high specific combining ability for most of lines combinations. from the 75 heterosis estimates, only three were negative.
Poliniza??o manual em abobrinha: efeitos nas produ??es de frutos e de sementes
Cardoso, Antonio Ismael Inácio;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000300008
Abstract: the effect of pollen quantity using manual pollination on seed production and the quality of summer squash was evaluated. female flowers were manually pollinated with a half or twice the pollen quantity of a male flower to get seeds named first cycle. later, female flowers of plants from these seeds were pollinated again with the same pollen quantity of the first cycle, getting seeds named second cycle. these four "populations" obtained (two in each cycle), besides the original one (commercial seeds of cv. piramoita), constituted the five treatments evaluated in a randomized block design, with six replications and ten plants/plot. fruit number per plant, fruit mean weight, seed yield per fruit and per plant, 100 seed weight, seed germination and vigor were estimated. greater fruit and seed number per plant were obtained with twice pollen quantity (2nd cycle) than a half pollen quantity (1st cycle). seed quality (germination and vigor) was not affect by treatments.
Sele??o para aumento de produtividade e qualidade de frutos em abobrinha 'Piramoita' comparando dois métodos de melhoramento
Cardoso, Antonio Ismael Inácio;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000300005
Abstract: the objective of this work was to compare two breeding methods to improve fruit yield and quality in 'piramoita' summer squash. three cycles of recurrent selection were made, with evaluation and selection of s1 progenies and recombination of plants from selected progenies to obtain improved populations after one (sr-1), two (sr-2) and three (sr-3) cycles. in the single seed descent (ssd), plants were selfed for five generations untill obtention and evaluation of s5 progenies. the nine best progenies were selected to obtain nine endogamous progenies (ssd-1 to ssd-9) and they were, also, inter-crossed to obtain a improved population by ssd (p-ssd). all obtained populations (sr-1, sr-2, sr-3, p-ssd, ssd-1 to ssd-9) and the original one (cv. piramoita), resulting 14 treatments, were evaluated in a randomized block design, with six replications and five plants per plot. the following characteristics were evaluated: number and weight of fruits per plant, total and commercial, mean fruit weight and rate of commercial fruits. improvements were obtained with increased commercial fruit yield along the recurrent selection cycles, and sr-3 population was superior to 'piramoita' regarding fruit number per plant. it was obtained a ssd progeny better than the original population and as productive as sr-3 population. ssd method is a good alternative for summer squash breeding, allowing evaluation and selection of progenies, only when the progenies are practically homozygous rather than each year.
Avalia??o de linhagens e híbridos experimentais de pepino do grupo varietal japonês sob ambiente protegido
Cardoso, Antonio Ismael Inácio;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000300014
Abstract: the objective of this work was to evaluate japanese cucumber experimental lines and hybrids under protected cultivation. 32 treatments (18 experimental hybrids, 12 lines and two commercial hybrids: tsuyataro and yoshinari) were evaluated at randomized blocks design, with 4 replicates and 4 plants per plot. the following characteristics were evaluated: total and commercial fruit number; rate of commercial fruits; fruit length (l), diameter (d) and l/d rate. treatment means were compared by scott-knot (5%) test and hybrids heterosis over parentals means and over superior parental were estimated. there were experimental hybrids as productive as commercial ones, and, in general, lines were less yielding than hybrids. in general, heterosis for fruit number were positive and high, while heterosis for fruit characteristics were of lesser values.
Número mínimo de colheitas em pepino híbrido estimado por meio do coeficiente de repetibilidade
Cardoso, Antonio Ismael Inácio;
Bragantia , 2006, DOI: 10.1590/S0006-87052006000400009
Abstract: the objective of this work was to estimate the minimum harvest number in experiments with cucumber. data of an experiment comparing 14 japanese cucumber hybrids in the randomized block design, with four replications and five plants per plot, under protected cultivation, were analyzed. thirty-two harvestings were made, three harvests a week, during 72 days to estimate repeatability coefficient based on analysis of the principal components for number and weight of total and commercial fruits per plant. results allowed to conclude that less than nine harvestings were enough to verify yield differences among hybrids, with 95% of probability to identify the highest yielding ones.
Avalia??o de cultivares de pepino tipo caipira sob ambiente protegido em duas épocas de semeadura
Cardoso, Antonio Ismael Inácio;
Bragantia , 2002, DOI: 10.1590/S0006-87052002000100007
Abstract: four varieties (branco coloni?o, caipira hortec, prêmio and rubi) and three hybrids (caipira ag-221, guarani ag-370 and safira) of cucumber were evaluated under protected cultivation at s?o manuel experimental farm (fca/unesp) during summer and winter seasons. the experimental model was randomized block, with four replicates of five plants per plot. `safira' f1 hybrid presented the highest yield during the summer (41.3 fruits/plant), while `premio' f1 hybrid had the smallest commercial yield (6.7 fruits/plant) during winter. in average, harvesting was initiated 51 days after sowing in the summer, and after 87 days in the winter. also hybrids were more precocious than open pollinated cultivars, in the summer. fruits surpassed commercial weight earlier in the summer than in the winter. it was concluded that `safira' f1 hybrid was the best cultivar for the summer, while in the winter all cultivars presented lower yield.
Produ??o e qualidade de sementes de cenoura das cultivares Brasília e Carandaí
Bragantia , 2000, DOI: 10.1590/S0006-87052000000100012
Abstract: the objective of the present work was to evaluate yield and quality of seeds on carrot cultivars brasília and carandaí. four replications of five plants were set out in a randomized complete block design. the roots were planted after 40 days of vernalization at 5 °c and the seed harvesting was in october. number of umbels, seed yield per plant and per umbel, 1.000 seed mass and germination, according to umbel order, were evaluated. cultivar brasilia had higher seed yield per plant (52 g), due to higher yield in secondary umbels (38 g), but not different from carandaí in primary and tertiary umbels. differences between cultivars were not observed in the other evaluated characteristics. primary umbel had greater seed yield (7.5 g per umbel), followed by secondary (3.0 g per umbel) and tertiary was the least productive (0.5 g per umbel). primary umbel seeds were heavier (2.1 g per 1.000 seeds) than secondary (1.6 g per umbel) and secondary were heavier than tertiary (1.4 g per umbel). seeds from primary and secondary umbels had better quality than tertiary umbel seeds.
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