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*Sel 3 and 4 are P. friedrichsthalianum; Sel 8 and 21 are P. cattleianum; all other are P. guajava. Mesocarp colour: W, white; C, cream/beige; P, pink. “Fruit shape: O, ovoid; R, round; P, pear. Table 1. Agronomic characteristics of the guava germplasm included in this work

Table 1 *Sel 3 and 4 are P. friedrichsthalianum; Sel 8 and 21 are P. cattleianum; all other are P. guajava. Mesocarp colour: W, white; C, cream/beige; P, pink. “Fruit shape: O, ovoid; R, round; P, pear. Table 1. Agronomic characteristics of the guava germplasm included in this work

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Table 2. Summary of qualitative characteristics measured in 52 guava accessions Numbers between parentheses indicate the number of accessions by class.
Table 2. Summary of qualitative characteristics measured in 52 guava accessions Numbers between parentheses indicate the number of accessions by class.
Table 3. Statistical summary of quantitative characteristics registered in 52 guava accessions
Table 3. Statistical summary of quantitative characteristics registered in 52 guava accessions
*p = 0.0001. Table 4. Eigenvalues of the most descriptive characteristics on the basis of principal component analysis in guava accessions Productivity
*p = 0.0001. Table 4. Eigenvalues of the most descriptive characteristics on the basis of principal component analysis in guava accessions Productivity
Fig. 1. Dispersion of guava accessions on the basis of the three major principal components of the principal components analysis of morphological data, which explained 29.8% of total variation.
Fig. 1. Dispersion of guava accessions on the basis of the three major principal components of the principal components analysis of morphological data, which explained 29.8% of total variation.
Table 5. Productive characteristics of guava germplasm during 3 years
Table 5. Productive characteristics of guava germplasm during 3 years
Table 6. Number of amplified bands by four amplified fragment length polymorphism (AFLP) combinations in 52 guava accessions
Table 6. Number of amplified bands by four amplified fragment length polymorphism (AFLP) combinations in 52 guava accessions
Fig. 2. Dendrogram of genetic dissimilarities among 52 guava accessions, performed by the UPGMA algorithm. Molecular marker methodologies such as RAPDs (Padilla-Ramirez et al., 2002; Prakash et al., 2002), AFLPs (Valdés-Infante et al., 2003) and microsatellites (Risterucci et al., 2005; Valdés-Infante et al., 2005; Sanabria et al., 2006) have been applied successfully in guava, and precise differentiation and classification have been reported. Until recently, guava characterizations had been limited to mor- phological and productive analysis of native genetic resources or outstanding native and introduced bred geno- types in different locations and years of evaluation. This is the first report where a reliable molecular marker system such as AFLPs has been used to identify genetic differences among guava germplasm and to establish its relationship with productivity in Mexico. Genetic diversity levels of Mexican guava germplasm will provide the breeders with a starting point for designing crosses to increase the genetic diversity of their material. AFLPs could constitute a reliable molecular marker test for assessing distinctness of new guava cultivars and for the management of reference
Fig. 2. Dendrogram of genetic dissimilarities among 52 guava accessions, performed by the UPGMA algorithm. Molecular marker methodologies such as RAPDs (Padilla-Ramirez et al., 2002; Prakash et al., 2002), AFLPs (Valdés-Infante et al., 2003) and microsatellites (Risterucci et al., 2005; Valdés-Infante et al., 2005; Sanabria et al., 2006) have been applied successfully in guava, and precise differentiation and classification have been reported. Until recently, guava characterizations had been limited to mor- phological and productive analysis of native genetic resources or outstanding native and introduced bred geno- types in different locations and years of evaluation. This is the first report where a reliable molecular marker system such as AFLPs has been used to identify genetic differences among guava germplasm and to establish its relationship with productivity in Mexico. Genetic diversity levels of Mexican guava germplasm will provide the breeders with a starting point for designing crosses to increase the genetic diversity of their material. AFLPs could constitute a reliable molecular marker test for assessing distinctness of new guava cultivars and for the management of reference
Table 7. Analysis of molecular variance (AMOVA) for guava germplasm analysed with amplifiec fragment length polymorphisms
Table 7. Analysis of molecular variance (AMOVA) for guava germplasm analysed with amplifiec fragment length polymorphisms
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