Articles
RELATIONSHIP BETWEEN ECOGEOGRAPHIC SAMPLING AND PHENOTYPIC DIVERSITY OF BRAZILIAN PSIDIUM GERMPLASM BASED ON CATEGORICAL DESCRIPTORS
Article number
849_7
Pages
69 – 76
Language
English
Abstract
Relationships between eco-geographic origin and phenotypic variation were established for 143 Psidium accessions, including araçá (a general term for wild-growing Psidium spp. in Brazil) and guava (P. guajava) species, sampled in 31 different eco-geographic regions of ten Brazilian States.
The accessions were characterized for 35 categorical traits according to the International Union for the Protection of New Varieties of Plants (UPOV) descriptors for P. guajava. The correlation between the cophenetic values and the simple matching matrices was 0.55, and the badness-of-fit of the multidimensional scaling was 0.30. Eighty-eight percent of the araçá accessions were grouped together and they clustered according to ecogeographic regions.
Clusters of guava accessions were verified only in collections from four Brazilian States, and did not present clustering by specific ecogeographic regions.
It was expected that the capturing of rare alleles and the enhancement of the genetic variability of Psidium germplasm could be achieved by sampling accessions according to predefined geographical areas, even for guava germplasm.
The accessions were characterized for 35 categorical traits according to the International Union for the Protection of New Varieties of Plants (UPOV) descriptors for P. guajava. The correlation between the cophenetic values and the simple matching matrices was 0.55, and the badness-of-fit of the multidimensional scaling was 0.30. Eighty-eight percent of the araçá accessions were grouped together and they clustered according to ecogeographic regions.
Clusters of guava accessions were verified only in collections from four Brazilian States, and did not present clustering by specific ecogeographic regions.
It was expected that the capturing of rare alleles and the enhancement of the genetic variability of Psidium germplasm could be achieved by sampling accessions according to predefined geographical areas, even for guava germplasm.
Authors
C.A. Fernandes-Santos, F. de França-Souza, M. Amorim-Rodrigues
Keywords
Psidium guajava, Psidium spp., MDS, phenogram, cluster analysis
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