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Ciência Rural

Print version ISSN 0103-8478


MANFIO, Candida Elisa et al. Repeatability in biometric characteristics of macaw palm fruit. Cienc. Rural [online]. 2011, vol.41, n.1, pp.70-76. ISSN 0103-8478.

Estimates of repeatability coefficient have been used in character study of several species of palms, helping to define the number and appropriate period of assessment of genotypes to increase the efficiency of breeding programs. For macaw palm there are no reports of such studies. In this context it is important to determine the repeatability coefficient of the following biometric characteristics of fruits: fruit weight, fruit volume, equatorial diameter of the fruit, kernel weight, kernel volume, equatorial diameter of de kernel, and thickness of the endocarp, and the determination of the minimum number of ratings for an efficient selection process and evaluation of macaw palm subsamples. The study was conducted at the Department of Plant Science, Federal University of Viçosa, and 145 macaw palm subsamples were analyzed, from collections made in the states of Minas Gerais, São Paulo, Mato Grosso do Sul, Pará, Maranhão and Pernambuco. There were significant differences for all traits analyzed, and there was agreement on the magnitude of repeatability coefficients of each feature obtained by different methods. However, the repeatability coefficients ranging between eight characteristics, from 0.68 to 0.99, and were observed for feature endocarp thickness and volume of kernel, respectively. The coefficient of determination obtained from 10 repetitions for the eight features and the four methods were superior to 95%. The evaluation of four fruits is sufficient to assess the traits of macaw palm subsamples with 90% accuracy.

Keywords : Acrocomia aculeata; measurement; estimation.

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