Phenotyping Sunflower Genetic Resources for Sclerotinia Head Rot Response Assessing Variability for Disease Resistance Breeding

Phenotyping Sunflower Genetic Resources for Sclerotinia Head Rot Response : Assessing Variability for Disease Resistance Breeding

Sclerotinia head rot (SHR) is one of the most serious constraints to sunflower (Helianthus annuus L. var. macrocarpus) production worldwide. Here, we evaluated the response to SHR in a sunflower inbred panel from a large INTA germplasm collection, consisting of 137 inbred lines (ILs). Field trials w...

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Bibliographische Detailangaben
Veröffentlicht in:Plant disease. - 1997. - 101(2017), 11 vom: 24. Nov., Seite 1941-1948
1. Verfasser: Filippi, C V (VerfasserIn)
Weitere Verfasser: Zubrzycki, J E, Di Rienzo, J A, Quiroz, F, Fusari, C M, Alvarez, D, Maringolo, C A, Cordes, D, Escande, A, Hopp, H E, Heinz, R A, Lia, V V, Paniego, N B
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Plant disease
Schlagworte:Journal Article
Beschreibung
Zusammenfassung:Sclerotinia head rot (SHR) is one of the most serious constraints to sunflower (Helianthus annuus L. var. macrocarpus) production worldwide. Here, we evaluated the response to SHR in a sunflower inbred panel from a large INTA germplasm collection, consisting of 137 inbred lines (ILs). Field trials were performed over five consecutive seasons using a twice-replicated randomized complete-block design. Disease incidence, disease severity, incubation period, and area under disease progress curve for disease incidence and severity were determined after controlled inoculation with the pathogen. Statistical analysis using mixed-effect models detected significant differences among ILs for all variables (P < 0.001). In addition, principal component analysis (PCA) and distance-based methods were used to classify the ILs according to their response to SHR, with ILs ALB2/5261 and 5383 emerging as the most resistant. Broad-sense heritability estimates ranged from 20.64% for disease severity to 10.58% for incubation period. The ample phenotypic variability of our collection, along with the moderate heritability estimates, highlight the importance of molecular breeding approaches to gain new insights into the genetic basis of sunflower resistance to SHR. The exhaustive phenotypic characterization presented here provides a reliable set of variables to comprehensively evaluate the disease and identifies two new sources of resistance to SHR
Beschreibung:Date Completed 16.04.2019
Date Revised 16.04.2019
published: Print-Electronic
Citation Status MEDLINE
ISSN:0191-2917
DOI:10.1094/PDIS-12-16-1784-RE