Repeatability analysis of guava fruit and leaf characteristics


  • José Henrique Soler Guilhen Universidade Federal do Espírito Santo
  • Luina Ribeiro Noia Universidade Federal do Espírito Santo
  • Carolina de Oliveira Bernardes Universidade Federal do Espírito Santo
  • Wagner Bastos dos Santos Oliveira Universidade federal de santa catarina
  • Tiago de Souza Marçal Universidade federal de viçosa
  • Marcia Flores da Silva Ferreira Universidade federal do espírito santo
  • Adésio Ferreira Universidade federal do espírito santo



Psidium guajava L., Pre-breeding, Biometric analysis


Psidium guajava L. (guava) is an important species that presents high genetic variability due to its mixed reproductive system, which is desired in breeding programs. Repeatability is an important tool for the selection of genotypes in pre-breeding studies. When genetic variability is present, the knowledge regarding the number of samples to be used in repeatability studies is indispensable. This study aims to determine the number of necessary measures while optimizing resources and maintaining the reliability of the results for the variables evaluated in P. guajava. The experiment was carried out with genotypes from three Brazilian States: Espírito Santo, São Paulo, and Minas Gerais, and a total of 79 P. guajava genotypes were collected. The following characteristics were evaluated: young leaf length and width; developed leaf length and width; fruit length; fruit diameter and fruit cavity diameter; and fruit weight and pulp weight. For the evaluated characteristics, deviance, permanent phenotypic and temporary environment variance, coefficients of repeatability and determination, accuracy and the number of estimated measurements required were determined. We established that the number of measurements required in repeatability analysis for a coefficient of repeatability with a reliability of 80% is four, for the measurements of developed leaf width, pulp weight, fruit diameter, and fruit cavity diameter.


Download data is not yet available.




How to Cite

GUILHEN, J.H.S., NOIA, L.R., BERNARDES, C. de O., OLIVEIRA, W.B. dos S., MARÇAL, T. de S., FERREIRA, M.F. da S. and FERREIRA, A., 2019. Repeatability analysis of guava fruit and leaf characteristics. Bioscience Journal [online], vol. 35, no. 2, pp. 377–388. [Accessed18 July 2024]. DOI 10.14393/BJ-v35n2a20198-41953. Available from:



Agricultural Sciences