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Stem and Crown Rot of Chickpea in California Caused by Sclerotinia trifoliorum
- The identities of Sclerotinia isolates obtained from chickpea plants showing stem and crown rot were determined using morphological characteristics, variations in group I introns, and internal transcribed spacer (ITS) sequences. Isolates could be separated into two groups based on growth rates at 22°C, fast growing (about 40 mm per day) versus slow growing (about 20 mm per day). All fast-growing isolates induced stronger color change of a pH-indicating medium than did slow-growing isolates at 22°C. The slow-growing isolates contained at least one group I intron in the nuclear small subunit rDNA, whereas all fast-growing isolates lacked group I introns in the same DNA region. ITS sequences of the slow-growing isolates were identical to sequences of Sclerotinia trifoliorum. Those of the fast-growing isolates were identical to sequences of S. sclerotiorum. Finally, the slow-growing isolates showed ascospore dimorphism, a definitive character of S. trifoliorum, whereas the fast-growing isolates showed no ascospore dimorphism. Isolates of both species were pathogenic on chickpea and caused symptoms similar to those observed in the field. This study not only associated the differences between S. sclerotiorum and S. trifoliorum in growth rates, group I introns, ITS sequences, and ascospore morphology, but also represented the first report that S. trifoliorum causes stem and crown rot of chickpea in North America.
Njambere, Evans N. , Chen, Weidong , Frate, Carol , Wu, Bo-Ming , Temple, Steve R. , Muehlbauer, Fred J.
Cicer arietinum , chickpeas , field crops , Sclerotinia trifoliorum , plant pathogenic fungi , crown rot , stem rot , pathogen identification , disease diagnosis , microbial genetics , internal transcribed spacers , introns , ribosomal DNA , ascospores , Sclerotinia sclerotiorum , new host records , California
- Includes references
- Plant disease: an international journal of applied plant pathology 2008 June, v. 92, no. 6
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.