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GrainGenes Reference Report: PDS-85-282

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Reference	PDS-85-282
Title	Resistance of sugarcane cultivar R 570 to Puccinia melanocephala isolates from different geographic locations
Journal	Plant Disease
Year	2001
Volume	85
Pages	282-286
Author	Asnaghi C D'Hont A Glaszmann JC Rott P
Abstract	Summary: 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 Reunion 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, Reunion 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
Keyword	[ Hide all but 1 of 23 ] brazil colombia correlation field gene in vitro inoculation island isolate pathogen progeny puccinia puccinia melanocephala resistance resistance gene resistant rust rust resistance rust resistance gene segregation single sugarcane symptoms

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