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Plant selection in F2 segregating populations of papaya from commercial hybrids
The objective of this paper was to estimate the genetic parameters and additive genetic values in segregating populations of papaya using the mixed model methodology. Two F2 populations from Tainung and Calimosa hybrids were evaluated. The experimental design was an augmented block with four replica...
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Published in: | Crop breeding and applied biotechnology 2012-09, Vol.12 (3), p.191-198 |
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Main Authors: | , , , , |
Format: | Article |
Language: | eng ; por |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The objective of this paper was to estimate the genetic parameters and additive genetic values in segregating populations of papaya using the mixed model methodology. Two F2 populations from Tainung and Calimosa hybrids were evaluated. The experimental design was an augmented block with four replicates, and Golden and Calimosa cultivars were the common treatment. Estimates of individual heritability were high for fruit length (FL) and weight (FW), moderate for fruit diameter (FD), and low for total soluble solids (TSS) and fruit firmness (FF). Considering FF and TSS as main traits for selection, genotypes of Calimosa-F2 population showed better performance to FF, but worse concerning TSS. It was selected 18.3% and 24.6% of plants from Tainung-F2 and Calimosa-F2 populations, respectively. Negative correlation between TSS and FF was not able to reduce the genetic gains. The segregating populations from Calimosa hybrid are more promising for the selection of papaya lines.
Objetivou-se estimar parâmetros genéticos e valores genotípicos em populações segregantes de mamoeiro com o método de modelos mistos. Foram avaliadas duas populações segregantes F2 dos híbridos Tainung e Calimosa. O delineamento experimental foi em blocos aumentados com quatro repetições, utilizando como testemunhas as cultivares Golden e Calimosa. As estimativas de herdabilidade individual foram altas para comprimento (CF) e peso do fruto (PF), moderadas para diâmetro (DF) e menores para sólidos solúveis totais (SST) e firmeza do fruto (FF). Considerando SST e FF como principais características para seleção, genótipos da população Calimosa-F2 apresentaram melhor desempenho em relação à FF, porém pior em relação à SST. Foram selecionados 18,30 e 24,61% dos indivíduos da população Tainung-F2 e Calimosa-F2, respectivamente. A existência de correlação negativa entre SST e FF não dificultou a obtenção de ganhos genéticos. Foi demonstrado que populações segregantes do híbrido Calimosa são mais promissoras para seleção de linhagens de mamoeiro. |
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ISSN: | 1518-7853 1984-7033 1984-7033 |
DOI: | 10.1590/S1984-70332012000300005 |