Abstract
Eucalypts rust (Puccinia psidii) is currently one of the major diseases in commercial eucalypt plantations in Brazil. The primary method of disease control is the use of resistant genotypes, and, among the different species of Eucalyptus, E. pellita is indicated as a promising source of resistance. In this work, the genetic control of rust resistance in E. pellita through inoculations under controlled conditions of 441 plants from four full-sibling families was studied. Inoculations were performed using the monopostular isolate UFV-2, race 1. All families tested segregated for rust resistance, and the number of resistant plants was higher than susceptible in all crosses. Inheritance models based on few genes did not fully explain the observed segregation patterns, and the narrow-sense heritability of rust resistance was estimated between 32.7% and 37.3%. The results suggested that rust resistance in E. pellita is complex and is controlled by major- and minor-effect genes.
Highlights
The primary method of disease control is the use of resistant genotypes, and, among the different species of Eucalyptus, E. pellita is indicated as a promising source of resistance
The results suggested that rust resistance in E. pellita is complex and is controlled by major- and minor-effect genes
Eucalypts rust caused by Puccinia psidii Winter is currently one of the major diseases of this genus (Alfenas et al 2009) and P. psidii has been reported to infect more than 100 plant species, all belonging to the family Myrtaceae
Summary
Eucalypts rust caused by Puccinia psidii Winter is currently one of the major diseases of this genus (Alfenas et al 2009) and P. psidii has been reported to infect more than 100 plant species, all belonging to the family Myrtaceae. Junghans et al (2003a) studied the rust resistance inheritance in full-sibling families of E. grandis and found that most of the phenotypic variation of the defense response is controlled by a major-effect gene, named Ppr (Puccinia psidii resistance gene 1). Further studies, in interspecific hybrids progenies indicated that the genetic control of rust resistance is complex (Teixeira et al 2009, Alves et al 2011b)
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