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A dominant avirulence gene in O robanche cumana triggers O r5 resistance in sunflower
Author(s) -
RodríguezOjeda M I,
PinedaMartos R,
Alonso L C,
FernándezEscobar J,
FernándezMartínez J M,
PérezVich B,
Velasco L
Publication year - 2013
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/wre.12034
Subject(s) - sunflower , virulence , biology , helianthus annuus , locus (genetics) , orobanche , gene , allele , genetics , race (biology) , parasitic plant , dominance (genetics) , botany , host (biology) , horticulture
Summary O robanche cumana is a weed that grows as a root parasite on sunflower. In general, the O . cumana –sunflower parasitic system is regarded to follow the gene‐for‐gene model, although this has never been demonstrated at the genetic level in O . cumana . The O r5 dominant gene in sunflower confers resistance to O . cumana race E , but not to race F . The objective of this research was to study the inheritance of avirulence/virulence in crosses between plants of O . cumana lines classified as races E and F . F our race E and three race F lines were developed, from which four race E × race F cross‐combinations were made, in three cases including reciprocals. In all cases, F 1 seeds did not have the ability to parasitise sunflower line P ‐1380 carrying the O r5 gene, indicating dominance of race E avirulence allele(s). F ive F 2 populations comprising a total of 387 F 2:3 families were evaluated on sunflower line P ‐1380. In all cases, one‐fourth of the F 2:3 families did not possess the ability to parasitise P ‐1380 plants, suggesting that race E avirulence and race F virulence on P ‐1380 are allelic and controlled by a single locus. This study demonstrated the gene‐for‐gene interaction in the O . cumana –sunflower parasite system and provided useful information to identify genes involved in O . cumana virulence. The approach followed in this research can contribute to define precisely races of the parasite on the basis of the presence of avirulence genes.