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GrainGenes Reference Report: PBR-118-491

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Reference	PBR-118-491
Title	Introgression of crown rust resistance from Festuca spp. into Lolium multiflorum
Journal	Plant Breeding
Year	1999
Pages	491-496
Author	Oertel C Matzk F
Abstract	Summary: Crown rust, Puccinia coronata Corda, causes one of the most damaging foliar diseases in Italian ryegrass, Lolium multiflorum Lam. For introgression of crown rust resistance, highly resistant hybrids of the crosses Festuca arundinacea (2n = 6x = 42) X L. multiflorum (2n = 4x = 28) and reciprocally, L. multiflorum (2n = 2x = 14) X Festuca pratensis (2n = 4x = 28) and subsequently resistant recombinant individuals were used as female parents and susceptible cultivars of Italian ryegrass as male parents in three successive backcrosses. The BC(3) plants were selfed and crossed mutually. Uredospores of seven different crown rust isolates collected from plants of L. multiflorum, Lolium perenne, F. pratensis, F. arundinacea and L. multiflorum X F. pratensis hybrids were applied to identify the resistance of susceptibility of the parental species, backcrossed, selfed and intercrossed progenies. The various crown rust populations revealed a species-specific capability to infect plants of the Lolium-Festuca complex corresponding to the host species from which the spores originated. Selected BC(3) plants, however, were found to be completely resistant to all crown rust populations tested. Successful introgression of the resistance was achieved from F. arundinacea as well as from F. pratensis. The resistance represents a dominant character, apparently based on a strong heterologous incompatibility between host and pathogen. In phenotype, bivalent formation during meiosis and in fertility, the novel germplasms are comparable with the L. multiflorum cultivars
Keyword	[ Hide all but 1 of 42 ] arundinacea backcross chromosome pairing crown crown rust crown rust resistance disease disease resistance dominance dominant fertility festuca festuca arundinacea festuca pratensis germplasm host host range hybrid incompatibility intergeneric hybridization introgression lolium lolium multiflorum lolium perenne meiosis multiflorum pathogen perenne plant breeding plant morphology population pratensis progeny puccinia puccinia coronata resistance resistant rust rust diseases rust resistance ryegrass susceptibility

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