Seleção de progênies femininas de mamoeiro para resistência a mancha-de-phoma via modelos mistos

Abstract

Landrace genotypes present sources of genes for adaptation, rusticity and resistance to diseases and environmental stress. This study evaluated the potential of landrace papaya genotypes in contributing to phoma-spot resistance genes. The experiment was a randomized block design with six replications consisted of 24 half-sib progenies of dioecious papaya - which segregated for sex. Only plants with female fowers were evaluated. We used mixed models to estimate variance components and the genetic value of landraces to incidence and severity of phoma-spot. Heritability estimates and selective accuracy demonstrated a favorable situation to the selection of resistant progenies,especially ‘STA-02’, ‘STA-04’, ‘STA-05’, ‘STA-06’, ‘STA-07’, ‘STA-11’, ‘STA-12’, ‘STA-16’, ‘STA-21’ and ‘STA-22’, which showed negative values of additive genetic efects for both incidence and severity of phoma-spot.