Prediction of genetic gain from selection indices for disease resistance in papaya hybrids

Revista Ceres

Marcelo Vivas²  Silvaldo Felipe Da Silveira¹  Messias Gonzaga Pereira¹ 

[1],Universidade Estadual do Norte FluminenseCampos dos Goytacazes Rio de Janeiro ,Brazil

关键词: combined selection;    genetic resistance;    Asperisporium caricaee;    Streptopodium caracae;    Phoma caricae-papayae;    seleção combinada;    resistência genética;    Asperisporium caricaee;    Streptopodium caracae;    Phoma caricae-papayae;   

DOI  :  10.1590/S0034-737X2012000600007

来源: SciELO

【 摘 要 】

In order to select superior hybrids for the concentration of favorable alleles for resistance to papaya black spot, powdery mildew and phoma spot, 67 hybrids were evaluated in two seasons, in 2007, in a randomized block design with two replications. Genetic gains were estimated from the selection indices of Smith & Hazel, Pesek & Baker, Williams, Mulamba & Mock, with selection intensity of 22.39%, corresponding to 15 hybrids. The index of Mulamba & Mock showed gains more suitable for the five traits assessed when it was used the criterion of economic weight tentatively assigned. Together, severity of black spot on leaves and on fruits, characteristics considered most relevant to the selection of resistant materials, expressed percentage gain of -44.15%. In addition, there were gains for other characteristics, with negative predicted selective percentage gain. The results showed that the index of Mulamba & Mock is the most efficient procedure for simultaneous selection of papaya hybrid resistant to black spot, powdery mildew and phoma spot.

【 授权许可】

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