Inheritance of resistance to phomopsis (Diaporthe helianthi) in sunflower

The inheritance of resistance of sunflower to phomopsis (Diaporthe helianthi) was studied on 10 inbred lines representing a range of resistance and susceptibility levels, and 25 hybrids from a factorial cross of these lines. Analyses of observations over a 3‐year period, of semi‐natural infection (p...

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Bibliographic Details
Published in:	Plant breeding Vol. 116; no. 3; pp. 277 - 281
Main Authors:	Vear, F, Garreyn, M, Tourvieille de Larbrouche, D
Format:	Journal Article
Language:	English
Published:	Oxford, UK Blackwell Publishing Ltd 01-07-1997 Blackwell
Subjects:	additive gene effects Agronomy. Soil science and plant productions Biological and medical sciences Diaporthe helianthi disease resistance experimental infections Fundamental and applied biological sciences. Psychology fungal diseases of plants genetic resistance Genetics and breeding of economic plants genotype growth rate Helianthus annuus hybrid hybrids inbred lines infection inheritance inheritance (genetics) leaves mycelium mycelium growth Pest resistance phomopsis resistance Plant pathogens resistance test screening seminatural infections Varietal selection. Specialized plant breeding, plant breeding aims Additivity Genetic inheritance Mycosis Plant pathogen Growth Hybrid Compositae Oil plant(vegetal) Fungus resistance Diaporthe Fungi Infection Helianthus annuus Dicotyledones Angiospermae Ascomycetes Spermatophyta Mycelium Thallophyta
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Summary:	The inheritance of resistance of sunflower to phomopsis (Diaporthe helianthi) was studied on 10 inbred lines representing a range of resistance and susceptibility levels, and 25 hybrids from a factorial cross of these lines. Analyses of observations over a 3‐year period, of semi‐natural infection (presence of stem lesions greater than 5 cm) on the hybrids indicated that additive gene control was predominant, with no significant interactions between parental effects. Correlations between infection of parental lines and the mean of their hybrids were not always significant, with certain inbreds which appeared quite susceptible giving hybrids with good levels of resistance. In order to predict hybrid values, it appears necessary to determine the general combining abilities of parental lines. Some inbreds gave very high levels of resistance, others gave very high levels of susceptibility. A test measuring the rate of extension of D. helianthi mycelium on leaves was significantly correlated with the results of natural infections. In particular, it permitted distinction of the most susceptible genotypes, and thus could be used in first generations of breeding to eliminate the most susceptible plants.
Bibliography:	ark:/67375/WNG-PL5RLH06-V istex:096694FB628144A09460288853C5634164624EC5 ArticleID:PBR277 Communicated by B. Schweisguth With 6 tables
ISSN:	0179-9541 1439-0523
DOI:	10.1111/j.1439-0523.1997.tb00996.x