Genetic parameters of husk spot resistance in macadamia breeding families

Husk spot caused by the Pseudocercospora macadamiae fungus induces premature abscission of fruit in many industry standard macadamia cultivars. Fungicides and other management strategies add to farm costs, thus breeding for varietal resistance is important. Genetic parameters of husk spot symptom ex...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Euphytica 2023-05, Vol.219 (5), p.54, Article 54
Hauptverfasser: Nunn, Jasmine, Hardner, Craig, De Faveri, Joanne, Akinsanmi, Olufemi A., O’Connor, Katie, Alam, Mobashwer, Topp, Bruce
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Husk spot caused by the Pseudocercospora macadamiae fungus induces premature abscission of fruit in many industry standard macadamia cultivars. Fungicides and other management strategies add to farm costs, thus breeding for varietal resistance is important. Genetic parameters of husk spot symptom expression had not previously been estimated. To guide selection methods for field resistance, over 300 open-pollinated seedlings of 32 families and 24 parent genotypes were inoculated, and seven symptom expression traits were evaluated. Narrow-sense and broad-sense heritabilities were estimated, breeding values were predicted, and correlations between breeding values of trait pairs were tested for significance. The traits with the highest heritabilities were necrotic lesion number per fruit ( H 2  = 0.41–0.59; h 2  = 0.21–0.30) and necrotic incidence ( H 2  = 0.19–0.27; h 2  = 0.17–0.24). Breeding values of the two traits were highly correlated (r = 0.98; p  
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-023-03169-2