Gray Leaf Spot of Perennial Ryegrass Turf in Pennsylvania

Landschoot, Peter J.; Hoyland, Bryce F.

doi:10.1094/pd-76-1280

Cited by 59 publications

(28 citation statements)

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“…Blast disease sometimes causes epidemics on a plant species that was previously not regarded as a host of M. grisea . One example is wheat blast, which was first reported in Brazil in 1985 (Igarashi et al ., 1986), and another is grey leaf spot on perennial ryegrass (perennial ryegrass blast), which was originally described more recently in 1992 in the USA (Landschoot and Hoyland, 1992). Interestingly, in both cases, the fertility of the newly appearing strains was high, at least under laboratory conditions (Urashima et al ., 1993; unpublished data).…”

Section: Discussionmentioning

confidence: 99%

Repeat‐induced point mutation (RIP) in Magnaporthe grisea: implications for its sexual cycle in the natural field context

Ikeda¹,

Nakayashiki²,

Kataoka³

et al. 2002

Molecular Microbiology

108

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SummaryRepeat-induced point mutation (RIP) is a process that detects DNA duplications and peppers their sequences with C:G to T:A transitions in the sexual phase of the life cycle. So far, this unique mechanism has been identified as a currently active process in only two fungal species, Neurospora crassa and Podospora anserina . To determine whether a RIP-like process operates in the plant pathogenic fungus Magnaporthe grisea , the retrotransposon MAGGY and the hygromycin B phosphotransferase gene were introduced into the fungus as multiple transgenes and examined for sequence alterations after a cross. Frequent C:G to T:A transitions in the transgenes were found in the descendants, preferentially in (A/ Tp)Cp(A/T) contexts, suggesting that a process similar to RIP functions in M. grisea . We also examined the sequence of another retrotransposon Pyret in six field isolates of M. grisea. Even though no perfect stage has been known in M. grisea under field conditions to date, RIP-like transitions were found in all the field isolates tested. Interestingly, the frequency of the transitions mostly correlated with the fertility of the isolates examined under laboratory conditions. These results imply that the sexual cycle of this fungus exists or existed in the natural field context.

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Section: Discussionmentioning

confidence: 99%

Repeat‐induced point mutation (RIP) in Magnaporthe grisea: implications for its sexual cycle in the natural field context

Ikeda¹,

Nakayashiki²,

Kataoka³

et al. 2002

Molecular Microbiology

108

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“…The values range from 0.57 to 0.76 (Table 7). Gray leaf spot is more severe on young seedlings than on mature plants (Landschoot and Hoyland, 1992). Broad-sense heritability is higher than narrow-sense heritability because it doesn't exclude nonadditive gene effects from genotypic variance.…”

Section: Heritabilitymentioning

confidence: 99%

“…G RAY LEAF SPOT has rapidly become one of the most important diseases of perennial ryegrass (Lolium perenne L.) in United States since its identification (Dernoeden, personal communications, 1986;Landschoot and Hoyland, 1992). The causual agent, P. oryzae Cavara [teleomorph Magnaporthe oryzae B. Couch, previously known as Magnaporthe grisea (Hebert) Barr], is a widely distributed filamentous ascomycete infecting more than 50 grasses including rice (Oryza sativa L.), wheat (Triticum aestivum L.), annual ryegrass (Lolium multiflorum Lam.…”

mentioning

confidence: 99%

Inheritance of Resistance to Gray Leaf Spot Disease in Perennial Ryegrass

et al. 2006

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Gray leaf spot disease, caused by Pyricularia oryzae Cavara, is an important disease in perennial ryegrass (Lolium perenne L.) turf. Host resistance is an ideal and promising approach to disease control. In this study, two diallel crosses involving six parents and eight parents, respectively, of perennial ryegrass were established to investigate the inheritance of gray leaf spot resistance. Parents and progenies were evaluated for gray leaf spot resistance in growth chamber experiments where they were inoculated with a mixture of five pathogen isolates. A field experiment was conducted on the progenies of one diallel cross.

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“…However, the economic impact of Magnaporthe is not limited to rice production. Certain species of Magnaporthe infect other economically important grasses including barley, wheat, pearl millet and turf-grass, the latter being a concern for the golf industry (Landschoot and Hoyland, 1992).…”

Section: Introductionmentioning

confidence: 99%