<i>Periconia circinata</i>
            , the Cause of Milo Disease

Leukel, R. W.; Johnson, A. G.

doi:10.1126/science.107.2769.93

Cited by 9 publications

(8 citation statements)

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“…In addition to the QTLs related to disease resistance identified in our study on SBI-06, this region also contains resistance genes such as the Rp1 (AAM03018) of maize for rust resistance, the Pc gene (EU583216) for resistance to sorghum milo disease (root and crown rot) caused by Periconia circinata (Mangin) Sacc., a soil-borne saprophytic fungus (Leukel 1948), the Pi37 (ABI94578) gene conferring resistance to rice blast fungus Pyricularia grisea Sacc. and the sorghum Rp1 (AAQ74890) gene, a homolog of the maize rust disease resistance locus Rp1 that confers resistance to Puccinia sorghi.…”

Section: Co-localization Of Qtlsmentioning

confidence: 99%

Identification of quantitative trait loci associated with resistance to foliar diseases in sorghum [Sorghum bicolor (L.) Moench]

et al. 2010

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Forage sorghum cultivars grown in India are susceptible to various foliar diseases, of which anthracnose, rust, zonate leaf spot, drechslera leaf blight and target leaf spot cause severe damage. We report here the quantitative trait loci (QTLs) conferring resistance to these foliar diseases. QTL analysis was undertaken using 168 F 7 recombinant inbred lines (RILs) of a cross between a female parental line 296B (resistant) and a germplasm accession IS18551 (susceptible). RILs and parents were evaluated in replicated field trials in two environments. A total of twelve QTLs for five foliar diseases on three sorghum linkage groups (SBI-03, SBI-04 and SBI-06) were detected, accounting for 6.9-44.9% phenotypic variance. The morphological marker Plant color (Plcor) was associated with most of the QTL across years and locations. The QTL information generated in this study will aid in the transfer of foliar disease resistance into elite susceptible sorghum breeding lines through marker-assisted selection.

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Section: Co-localization Of Qtlsmentioning

confidence: 99%

Identification of quantitative trait loci associated with resistance to foliar diseases in sorghum [Sorghum bicolor (L.) Moench]

et al. 2010

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“…The root and crown rot of sorghum known as milo disease is caused by the peritoxin produced by the saprophytic fungus Periconia circinata (Leukel 1948). The toxin alone mimics most symptoms of the disease, including highly condensed heterochromatin and efflux of potassium ions, traits reminiscent of the hypersensitive response (Arias et al 1983;Dunkle and Macko 1995).…”

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confidence: 99%

Pathogen corruption and site-directed recombination at a plant disease resistance gene cluster

Nagy¹,

Bennetzen²

2008

Genome Res.

101

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The Pc locus of sorghum (Sorghum bicolor) determines dominant sensitivity to a host-selective toxin produced by the fungal pathogen Periconia circinata. The Pc region was cloned by a map-based approach and found to contain three tandemly repeated genes with the structures of nucleotide binding site–leucine-rich repeat (NBS–LRR) disease resistance genes. Thirteen independent Pc-to-pc mutations were analyzed, and each was found to remove all or part of the central gene of the threesome. Hence, this central gene is Pc. Most Pc-to-pc mutations were associated with unequal recombination. Eight recombination events were localized to different sites in a 560-bp region within the ∼3.7-kb NBS–LRR genes. Because any unequal recombination located within the flanking NBS–LRR genes would have removed Pc, the clustering of cross-over events within a 560-bp segment indicates that a site-directed recombination process exists that specifically targets unequal events to generate LRR diversity in NBS–LRR loci.

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“…Fungi other than these seem to be saprophytes or facultative necrotrophs (Cooke 1977 (Koehler and Woodworth 1938), almond full-twig disease by Rhizopus spp. (Mirocha and Wilson 1961) and milo disease of sorghum by Periconia circinata (Leukel 1948). These fungi have been variously called nonparasitic or saprophytic pathogens or exopathogens (Woltz 1978).…”

Section: Discussionmentioning

confidence: 97%