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

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.

Bibliographic Details

Main Authors:	Asnaghi, Carole, D'Hont, Angélique, Glaszmann, Jean-Christophe, Rott, Philippe
Format:	article biblioteca
Language:	eng
Subjects:	H20 - Maladies des plantes, Saccharum, Puccinia melanocephala, résistance aux maladies, http://aims.fao.org/aos/agrovoc/c_6725, http://aims.fao.org/aos/agrovoc/c_27331, http://aims.fao.org/aos/agrovoc/c_2328,
Online Access:	http://agritrop.cirad.fr/479243/
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