divergência genética entre acessos de taro genetic diversity in taro accessions
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2004
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Abstract
Avaliou-se a variabilidade existente entre 36 acessos de taro do Banco de Germoplasma de Hortaliças da Universidade Federal de Viçosa em componentes do rendimento, visando a identificação de acessos produtivos e divergentes para serem utilizados em programas de melhoramento. O experimento foi conduzido na horta de pesquisas da UFV, de 19/09/2000 a 13/06/2001. Utilizou-se o delineamento experimental blocos casualizados, com cinco repetições. A parcela foi composta de quatro fileiras de 4 m de comprimento, espaçadas por 1,0 m e, entre plantas, 0,5 m, totalizando 32 plantas. Avaliou-se a produtividade de rizomas comerciáveis/planta; peso médio de rizomas comerciáveis; número de rizomas comerciáveis/planta; produtividades de rizomas-mãe, filho grande, filho médio, filho pequeno e refugo/planta. Os dados foram submetidos às análises por variáveis canônicas e de agrupamento pelo método de Tocher, adotando a distância generalizada de Mahalanobis (D²) como estimativa da similaridade genética. Os acessos foram separados em seis grupos, sendo que 80,56% dos mesmos constituíram um único grupo. Os acessos BGH 5916, BGH 6137 e BGH 6298 destacaram-se pelo elevado potencial agronômico e pela divergência genética, o que os qualifica como promissores para serem utilizados em programas de melhoramento. As características com maior contribuição relativa para a divergência genética foram produtividade de rizomas filho grande/planta (42,50%), produtividade de rizomas filho pequeno/planta (24,67%) e produtividade de rizomas comerciáveis/planta (16,95%).
The genetic similarity among 36 accessions of taro from the Horticultural Germplasm Bank of the Federal University of Viçosa, Brazil, was evaluated. The experiment was conduced from 09/19/2000 to 06/13/2001. The experimental design was a randomized block with five replicates and each plot consisted of four rows spaced 1.0 m apart with four meters in length and 0.5 m between plants within the row. Parameters such as yield of commercial rhizomes/plant; yield of mother rhizomes; large, medium and small lateral rhizomes and non-commercial rhizomes/plant were measured. Data were analyzed using canonical variable and grouped by Tocher's method, adopting general distance of Mahalanobis(D²). The accessions formed six groups. A total of 80.56% of the accessions formed one single group. Accessions BGH 5916, BGH 6137 and BGH 6298 showed good agronomic potential and high genetic diversity compared to other accessions, being indicated for breeding progenitors. Yield of large lateral rhizomes/plant (42.50%), small rhizomes/plant (24.67%) and of commercial rhizomes/plant (16.85%) contributed to increase genetic diversity.
The genetic similarity among 36 accessions of taro from the Horticultural Germplasm Bank of the Federal University of Viçosa, Brazil, was evaluated. The experiment was conduced from 09/19/2000 to 06/13/2001. The experimental design was a randomized block with five replicates and each plot consisted of four rows spaced 1.0 m apart with four meters in length and 0.5 m between plants within the row. Parameters such as yield of commercial rhizomes/plant; yield of mother rhizomes; large, medium and small lateral rhizomes and non-commercial rhizomes/plant were measured. Data were analyzed using canonical variable and grouped by Tocher's method, adopting general distance of Mahalanobis(D²). The accessions formed six groups. A total of 80.56% of the accessions formed one single group. Accessions BGH 5916, BGH 6137 and BGH 6298 showed good agronomic potential and high genetic diversity compared to other accessions, being indicated for breeding progenitors. Yield of large lateral rhizomes/plant (42.50%), small rhizomes/plant (24.67%) and of commercial rhizomes/plant (16.85%) contributed to increase genetic diversity.
| Reference Key |
pereira2004horticulturadivergncia
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| Authors | ;Francisco Hevilásio F. Pereira;Mário Puiatti;Glauco V. Miranda;Derly José H. da Silva;Fernando Luiz Finger |
| Journal | research on biomedical engineering |
| Year | 2004 |
| DOI |
10.1590/S0102-05362004000100011
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