Multivariate analysis of morphological characteristics of two species of passion flower with ornamental potential and of hybrids between them.

We estimated genetic parameters through multivariate analysis of two species of Passiflora and their hybrids, considered of ornamental potential, based on the morphological characteristics: flower diameter, corona diameter, corona filament size, flower peduncle length, petal length and width, sepal length and width, internode length, stem diameter, leaf length, leaf width (mm), and leaf area (cm(2)). Five specimens of Passiflora sublanceolata [ex P. palmeri var. sublanceolata], five of P. foetida var. foetida and 20 F(1) hybrids between the two were evaluated. A randomized block design with four replications was used. The data were submitted to variance analysis and multivariate procedures, principal components analysis and unweighted pair group method with arithmetic mean grouping. We found significant differences between genotypes for all these morphological parameters. The hybrid plants had the highest variability, making them the most indicated for future improvement programs. The various multivariate techniques gave similar results, allowing separation of the plants into three distinct groups, these being the two paternal species and the hybrids. The hybrids were closer to the male genitors, revealing a paternal effect on the inheritance of vegetative and floral characters. Based on estimates of genetic parameters, the floral characteristics are the most indicated for the selection of plants for ornamental purposes, since these characteristics displayed greatest variability, a variation index of more than one, and high genotypic determination coefficients.

[1]  A. J. Viana,et al.  Genetic diversity in Passiflora species determined by morphological and molecular characteristics , 2010, Biologia Plantarum.

[2]  L. D. H. C. S. Conceição,et al.  Comparison of coefficients and distance measurements in passion fruit plants based on molecular markers and physicochemical descriptors. , 2009, Genetics and molecular research : GMR.

[3]  A. Viana,et al.  Seleção recorrente intrapopulacional no maracujazeiro amarelo: alternativa de capitalização de ganhos genéticos , 2009 .

[4]  A. F. Almeida,et al.  Passion flower hybrids and their use in the ornamental plant market: perspectives for sustainable development with emphasis on Brazil , 2009, Euphytica.

[5]  L. P. Queiroz,et al.  Uma nova espécie de Passiflora L. (Passifloraceae) para o Brasil , 2007 .

[6]  R. Ohsawa,et al.  Diallel analysis of floral morphology in radish (Raphanus sativus L.) , 2007, Euphytica.

[7]  A. Viana,et al.  Seleção e herdabilidade na predição de ganhos genéticos em maracujá-amarelo , 2007 .

[8]  I. Geraldi,et al.  Genetic and Phenotypic Parameter Estimates for Yield and Fruit Quality Traits from a Single Wide Cross in Yellow Passion Fruit , 2005 .

[9]  J. O. Pérez,et al.  Variación morfológica de tres especies de curubas (Passiflora tripartita var. mollissima, P. tarminiana y P. mixta) y sus híbridos en el Valle del Cauca (Colombia) , 2005 .

[10]  A. C. Cervi.  ESPÉCIES DE Passiflora L. (PASSIFLORACEAE) PUBLICADAS E DESCRITAS NOS ÚLTIMOS 55 ANOS (1950 –2005) NA AMÉRICA DO SUL E PRINCIPAIS PUBLICAÇÕES BRASILEIRAS. , 2005 .

[11]  A. Viana,et al.  Parametros geneticos em populacoes de maracujazeiro-amarelo , 2004 .

[12]  L. Vieira,et al.  Genetic diversity in passion fruit (Passiflora spp.) evaluated by RAPD markers , 2003 .

[13]  N. Williams.  Passion flowers , 2003, Current Biology.

[14]  E. B. Radmann,et al.  Caracterização de cultivares apirênicas de citros de mesa por meio de descritores morfológicos , 2003 .

[15]  G. S. Schmidt,et al.  Análise de qualidade de grãos de milho , 1983 .

[16]  Daljit Singh.  The Relative Importance of Characters Affecting Genetic Divergence , 1981 .

[17]  J. Francis.  The American Species Of Passifloraceae Vol-19 , 1938 .