Resistance of sugarcane cultivar R 570 to Puccinia melanocephala isolates from different geographic locations

Asnaghi Carole, D'Hont Angélique, Glaszmann Jean-Christophe, Rott Philippe. 2001. Resistance of sugarcane cultivar R 570 to Puccinia melanocephala isolates from different geographic locations. Plant Disease, 85 (3) : 282-286.

Résumé : Two different inoculation techniques were investigated before studying the reaction of the major rust resistance gene of sugarcane cultivar R 570 against isolates of Puccinia melanocephala from different geographic locations. Cultivar R 570 exhibited severe rust symptoms when in vitro plantlets were inoculated with a rust isolate from Réunion Island, but a good correlation with field resistance was observed when detached leaves were inoculated with the pathogen. This latter technique was then used to inoculate R 570 and a sample of its self progeny with rust isolates from Brazil, Colombia, Florida (three isolates), Guadeloupe, Réunion Island, and Zimbabwe. R 570 was resistant to all isolates of P. melanocephala, and the segregation of resistance in the progeny did not change with the isolates, suggesting that a single gene, or a single chromosomic region, was involved in the resistance against all tested isolates. This major resistance gene has, therefore, potential value to improve resistance to rust in various geographic regions.

Mots-clés Agrovoc : Saccharum, Puccinia melanocephala, résistance aux maladies

Classification Agris : H20 - Maladies des plantes

Auteurs et affiliations

• Asnaghi Carole, CIRAD-CA-Canne à sucre (FRA)
• D'Hont Angélique, CIRAD-CA-Canne à sucre (FRA)
• Glaszmann Jean-Christophe, CIRAD-AMIS-BIOTROP (FRA) ORCID: 0000-0001-9918-875X
• Rott Philippe, CIRAD-CA-Canne à sucre (FRA) ORCID: 0000-0001-6085-6159

Source : Cirad - Agritrop (https://agritrop.cirad.fr/479243/)

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