Caracterização da diversidade genética de acessos de ave-do-paraíso

Alessandro Aparecido Brito Dos Santos,Thallita Santos Guimarães,Marco Antonio Aparecido Barelli,Valdete Campos Ambrosio,Petterson Baptista Da Luz

doi:10.14295/oh.v24i1.1132

Alessandro Aparecido Brito Dos Santos, Thallita Santos Guimarães + Show 3 more

Open Access

https://doi.org/10.14295/oh.v24i1.1132

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Journal: Ornamental Horticulture	Publication Date: Apr 26, 2018
License type: cc-by

Abstract

This study aimed to characterize genetic diversity in the bird-of-paradise (Strelitzia reginae) collection at the Universidade do Estado de Mato Grosso Carlos Alberto Reyes Maldonado (UNEMAT) by estimating genetic divergence among genotypes based on agronomic characteristics. Seven agronomic characters were evaluated with average Euclidean distance. The UPGMA (Unweighted Pair Group Method with Arithmetic Mean) hierarchical clustering method was used between groups, as well as Tocher’s optimization clustering method and principal component analysis (PCA), in order to classify the genotypes with maximum similarity between groups. Measures of genetic dissimilarity with average Euclidean distance verified the existence of genetic variability among accessions since the amplitude of dissimilarity values ranged from 1.09 to 36.97. Tocher’s clustering method verified the formation of two distinct groups. UPGMA hierarchical clustering, based on the dissimilarity matrix, verified the formation of three groups with 30% cutoff point. Based on the main components analysis, we verified genetic divergence between the bird-of-paradise accessions in the UNEMAT Collection. The most promising combinations for future crosses in breeding programs comprise accessions 1, 11, and 23 and accession 1 as the most divergent among the accessions evaluated.

Highlights

Tropical ornamental plants and flowers are gaining importance in floriculture owing to the attractiveness of the flowers and leaves, as well as their exotic colors, shapes, sizes and durability
The present study aimed to genetically characterize bird of paradise accessions from the UNEMAT Collection based on agronomic characteristics
Future genetic improvement programs can be suggested for these accessions showing high genetic divergence since their progeny would have greater genetic variability, which is desirable for plant crossings

Summary

Introduction

Tropical ornamental plants and flowers are gaining importance in floriculture owing to the attractiveness of the flowers and leaves, as well as their exotic colors, shapes, sizes and durability. Bird of paradise (Strelitzia reginae) has been cultivated for cut flowers based on their exotic colors and shapes, as well as vase life (durability), length of stems, and plant resistance to pests and diseases (WOOD, 1995; MACNISH et al, 2010; TERAO et al, 2005). The bird of paradise tends toward polymorphism; each plant originated from seed presents its own characteristics, especially as reflected in plant height, shape and size of leaves, stem length, and flower size, among other characteristics (TERAO et al, 2005). Species characterization has been very important to breeding programs since they provide parameters by which to identify the parents, contributing to greater heterosis in the progeny and high probability of achieving superior genotypes in segregating generations, in addition to gaining increased knowledge about the genetic basis of plant populations as a whole (FERRÃO et al, 2002).

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