repetibilidade e número mínimo de medições para caracteres de cacho de bacabi (oenocarpus mapora) repeatability and minimum number of measurements for characters of bacabi palm (oenocarpus mapora) racemes

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ID: 177187
2010
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Abstract
A bacabi (Oenocarpus mapora H. Karsten) é uma palmeira perene nativa da Amazônia, que produz cachos com centenas de frutos que apresentam grande potencialidade à agroindústria de polpa, mas tem sido pouco estudada. Os objetivos deste trabalho foram estimar os coeficientes de repetibilidade e determinar a previsibilidade e o número de medições necessárias para caracteres de cacho dessa palmeira. Foram avaliados 27 indivíduos de bacabi pertencentes ao Banco de Germoplasma de Oenocarpus/Jessenia da Embrapa Amazônia Oriental, em Belém-PA. De cada planta, foram colhidos três cachos em maturação completa para a mensuração de seis caracteres: peso total do cacho (PTC) e de frutos por cacho (PFC), número de ráquilas por cacho (NRC), comprimento da ráquis por cacho (CRC), peso de 100 frutos (PCF) e rendimento de frutos por cacho (RFC). As estimativas de repetibilidade foram obtidas pelos métodos estatísticos da análise de variância, componentes principais e análise estrutural. Em todos os caracteres, as estimativas de repetibilidade apresentaram valores muito semelhantes nos três métodos. As estimativas dos coeficientes de repetibilidade e as previsibilidades foram relativamente altas (r 0,60 e R² 81,7%) para os caracteres número de ráquilas e rendimento de frutos por cacho, demonstrando regularidade dos genótipos nas várias medições (cachos), em todos os métodos. Para esses caracteres, o número mínimo de cachos necessários para a avaliação do real valor dos genótipos foi de treze (RFC) e cinco (NRC) cachos com confiabilidade de 95%, tornando-os factíveis no uso de inferências genéticas para as condições do estudo. Os demais caracteres exibiram repetibilidades e coeficientes de determinação de médias a baixas magnitudes, indicando necessidade de maior controle ambiental para suas mensurações.
Bacabi (Oenocarpus mapora H. Karsten) is a native Amazonian palm that produces racemes with hundreds of fruits with great potential for commercial and food uses, but has not been well studied. The objectives of this study were to estimate the repeatability coefficients, determine predictability and the number of measurements needed for raceme characters of this palm. 27 individuals of bacabi that belong to the Germplasm Bank of Oenocarpus/Jessenia at Embrapa Eastern Amazon, in Belém, PA, Brazil were evaluated. Three fully matured racemes from each plant were sampled to measure six characters: total weight of raceme (TWR) and fruit weight per raceme (FWR), number of rachillae per raceme (NRR), rachis length per raceme (RLR), weight of 100 fruits (WHF) and fruit yield per raceme (FER). The repeatability estimates were obtained by three statistical methods: analysis of variance; principal components; and structural analysis. For all characters, the estimates of repeatability coefficients presented values with very similar magnitudes in the three methods. The estimates of repeatability coefficients and determination coefficients were relatively high (r 0.60 and R2 81.7%) for the characters FER and NRR, showing genotype regularity for these raceme measurements. For these characters, the minimum number of racemes necessary to estimate the true character value of the genotypes was thirteen (FER) and five (NRR), with 95% reliability. The remaining characters showed repeatabilities and determination coefficients with medium to low values, indicating the need for better environmental control to make the measurements.
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Authors ;Maria do Socorro Padilha de Oliveira;Elisa Ferreira Moura
Journal technocom
Year 2010
DOI
DOI not found
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452010000400027
Keywords
heritability structural analysis

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