ISHS Acta Horticulturae 959: III International Symposium on Guava and other Myrtaceae
PRELIMINARY STUDY OF WILD GUAVA FROM ESPIRITO SANTO AND MINAS GERAIS BY CONTINUOUS DESCRIPTORS |
| Authors: | A.M. Nogueira, A. Ferreira , M.F.S. Ferreira , E. Mangaravite |
| Keywords: | Psidium guajava, breeding, conservation, genetic variability |
| DOI: | 10.17660/ActaHortic.2012.959.3 |
| Abstract:
The introduction, characterization and selection of new guava genotypes, with interesting traits for breeding, are of great relevance in view of the competitiveness within the guava market. Genetic variability studies based on metrical characteristics of leaf and fruit may indicate genetically divergent wild genotypes with suitable traits for crop improvement. Most characteristics that are relevant for guava breeding are continuous, i.e., controlled by many genes. In this context, the aim of the present work was to perform a descriptive analysis of 66 wild guava trees that might reveal promising genotypes for breeding. Eleven continuous descriptors were employed. Five young leaves, ten developed leaves and five fruits of each plant were collected in the localities of Alegre, Guaçuí, Cachoeiro de Itapemirim, Mimoso do Sul, Muqui and Jerônimo Monteiro, in the south of the State of Espírito Santo, as well as in Caparaó, State of Minas Gerais. For each plant were evaluated: young leaf length (YLL) and width (YLW); developed leaf length (DLL) and width (DLW); fruit mass (FM), length (FL) and diameter (FD); pulp mass (PM) and diameter (PD); and seed mass (SM) and number (SN). Assessment of genotypes by location was done by average graph with 95% confidence interval. Maximum values for the fruit descriptors FM, FL, FD, PM, SM and SN were found in Guaçuí; for FD and PD in Muqui; and for FD in Jerônimo Monteiro. These results suggest that the analyzed genotypes, except those bearing a large number of seeds, could be explored in breeding programs, owing to some of their interesting characteristics, such as large fruit mass and size. | |
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