Determinação do período de avaliação da produção em maracujazeiro amarelo para fins de seleção precoce

• Autor(a) principal: Pimentel, Leonardo Duarte
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4653
• topic: Maracujá; Passiflora edulis f. flavicarpa; Seleção massal; Correlação fenotípica; Passion fruit; Passiflora edulis f. flavicarpa; Selection; Correlation; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

The productivity of the passion fruit plant is function of several factors, as genetic potential, pollination, planting date, age of the plants and climatic conditions, among others. However, there still is not a defined pattern for production evaluation in the culture. Some authors evaluate the production starting from given sample, without a defined time and, a lot of times, incurring in mistaken conclusions or committing the success of the improvement programs. In this sense, it was aimed at to establish an evaluation period (monthly), whose production and quality of the fruits was representative of the whole productive period (two years), seeking to optimize the selection strategies and to standardize the evaluation of the plants. The experiment was led in the Experimental Station of Agronomic Institute of Paraná (IAPAR), in the Londrina city, state of Paraná, Brazil. They were appraised 111 accesses of yellow passion fruit plant, coming of the South and Brazilian Southeast, during two consecutive crops. Was considered the variables: Production for plant (P), number of fruits for plant (NF) and weigh medium of fruits (PMF). The data of monthly and annual production were correlated with the accumulated production in two years. The second cycle presented larger correlations with the total production accumulated than the first (little croup), in the three studied variables - P, NF and PMF, indicating that the selection in the 2nd year it can be more efficient. Already in the monthly evaluations, the third month of production (regarding the 1st pull of bloomed) of both years, it presented larger correlations with the accumulated production, for which better representative was observed in the evaluation accomplished in the 3rd month of the second year. The variable PMF presented a pattern relatively uniform, indicating that plant with small fruits they should be eliminated soon in the first evaluations. Starting from the coefficients of correlations calculated, it was made a selection simulation based the 3rd month of production of the 1st and 2nd cycle. It was considered percentile of growing selection, varying between 10 and 50%; for both strategies - selection positive and negative, in order to verify the efficiency in the prediction of superior genotypes or in the elimination of the inferior, respectively. The selection precocious (monthly) for P and NF, it presented larger success percentage in the 2nd year of evaluation. For PMF, the selection negative presented constant pattern when compared the 1st with 2nd year, reinforcing the possibility to discard precociousness the plants with small fruits.