Genetic control of partial resistance to ‘collar’ and ‘root’ isolates of <Emphasis Type="Italic">Phoma macdonaldii</Emphasis> in sunflower |
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| Authors: | T Abou Al Fadil G Dechamp-Guillaume R Darvishzadeh A Sarrafi |
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| Institution: | (1) Department of Biotechnology and Plant breeding, BAP, INP-ENSAT, Toulouse University, 18 Chemin de Borde Rouge , BP 32607, 31326 Castanet, France |
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| Abstract: | Phoma macdonaldii is one of the most important pathogens of sunflower (Heliantus annuus) in France. In order to determine the inheritance of resistance to the disease, five sunflower genotypes with wide genetic
variability for resistance to two ‘collar’ and two ‘root’ Phoma isolates were crossed in a diallel programme. Four separate
experiments were undertaken under controlled conditions. In each one, the response of parental genotypes and their F1 hybrids
were evaluated with one of the four Phoma isolates. Analysis of variance was performed to determine the effects of genotype
on disease severity score when inoculated with ‘collar’ or ‘root’ Phoma isolates and showed significant variability among
parents and F1 hybrids for disease severity score. Diallel analysis showed that general combining ability (GCA) and specific
combining ability (SCA) effects for resistance to ‘collar’ and ‘root’ Phoma isolates were highly significant for each of the
four isolates indicating that both kinds of gene effects were important in controlling the resistance. The GCA/SCA ratios
were more than one for three out of four isolates showing that additive genetic effects were more important than non-additive
effects for resistance to three of the studied Phoma isolates. Hence, conventional breeding methods could be recommended to
achieve genetic improvement to such ‘collar’ and ‘root’ Phoma isolates. |
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| Keywords: | Combining abilities Disease severity F1 hybrids Inheritance Helianthus annuus |
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