Inheritance of resistance to sunflower broomrape (Orobanche cumana Wallr.) in an interspecific cross between Helianthus annuus and Helianthus debilis subsp. tardiflorus
With 2 tables Sunflower broomrape (Orobanche cumana Wallr.) constrains sunflower cultivation in many areas of Europe and Asia. Populations classified as race G that overcome all known resistance genes have recently appeared. The objective of this research was to study the inheritance of resistance to broomrape race G in a resistant accession of Helianthus debilis subsp. tardiflorus. Heads of H. debilis subsp. tardiflorus were emasculated and pollinated with pollen of the Helianthus annuus-susceptible line HA 89. BC 1F 1, BC 1F 2, BC 1F 3, BC 2F 1, BC 2F 2 and BC 2F 3 generations were developed and evaluated for broomrape resistance. F 1 plants were resistant, indicating dominance of resistance. BC 1 populations segregated in a ratio of one resistant to one susceptible plant, whereas BC 1F 2 and BC 2F 2 populations segregated in a ratio of three resistant to one susceptible plant, which was confirmed in the evaluation of the BC 1F 3 and BC 2F 3 populations. The results indicated that resistance to broomrape race G in H. debilis subsp. tardiflorus is controlled by dominant alleles at a single locus. This mode of inheritance will facilitate the introgression of resistance into elite cultivars. © 2011 Blackwell Verlag GmbH.
| Main Authors: | , , , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Blackwell Publishing
2012-02
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| Subjects: | Helianthus annuus, Helianthus debilis subsp. tardiflorus, Genetic resistance, Orobanche cumana, Sunflower broomrape, |
| Online Access: | http://hdl.handle.net/10261/88818 |
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