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Thirty wild  Helianthus  species, several interspecific hybrids and 380 recombinant interspecific inbred lines (RIILs) derived from interspecific crosses between the cultivated sunflower and four diploid annuals (wild  H.  annuus, H. argophyllus, H. petiolaris  and  H. debilis ) and three diploid perennials ( H. occidentalis, H. maximiliani  and  H. divaricatus ) were studied for reaction to rust caused by  Puccinia helianthi  under severe natural epiphytotic condition. The disease incidence ranged from 0 to 100% in the stable interspecific derivatives while none of the wild sunflowers and their F 1  hybrids revealed susceptibility to rust. The disease severity in the RIILs varied between 0 and 40%. The mean disease severity was low in lines derived from diploid annuals (6.0-10.4%) as compared with those derived from diploid perennials (23.1- 31.1%). One line (PS 1089) derived from  H. argophyllus  × cultivated sunflower and two lines (PS 2011 and PS 2032) derived from  H.  petiolaris  × cultivar crosses were found to be immune. Disease severity and disease incidence were correlated with various physiological traits.

helia

DIFFERENTIAL REACTION OF RECOMBINANT INTERSPECIFIC INBRED LINES OF SUNFLOWER TO RED RUST INCITED BY Puccinia helianthi / REACCIÓN DIFERENCIAL DE LAS INTERESPECIES DE LAS LÍNEAS INBRED DE GIRASOL A ROYA NEGRA CAUSADA POR EL HONGO Puccinia helianthi / RÉACTION DIFFÉRENTIELLE DES LIGNES RECOMBINANTES INBRED INTERSPECIES DE TOURNESOL À LA ROUILLE ROUGE PROVOQUÉE PAR LE CHAMPIGNON Puccinia helianthi