Open AccessEvaluation of Tobacco Germplasm for Seedling Resistance to Stem Rot and Target Spot Caused by Thanatephorus cucumeris
Author(s) -
Patsy Elizabeth Elliott,
Ramsey S. Lewis,
H. D. Shew,
W. A. Gutierrez,
Jennifer Nicholson
Publication year - 2008
Publication title -
plant disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.663
H-Index - 108
eISSN - 1943-7692
pISSN - 0191-2917
DOI - 10.1094/pdis-92-3-0425
Subject(s) - biology , rhizoctonia solani , germplasm , leaf spot , stem rot , seedling , nicotiana tabacum , rhizoctonia , plant disease resistance , horticulture , resistance (ecology) , genotype , botany , agronomy , genetics , gene
Stem rot and target spot of tobacco, caused by Rhizoctonia solani and its teleomorph Thanatephorus cucumeris, respectively, can cause serious problems in production of tobacco (Nicotiana tabacum) seedlings. Previous screens for genetic resistance in tobacco have been limited. The objective of this study was to evaluate 97 genotypes composing several classes of tobacco and related Nicotiana spp. for seedling resistance to stem rot and target spot. Significant differences in disease incidence initially were observed among the genotypes for both stem rot and target spot; however, resistance to target spot was not observed when disease pressure was high. Partial resistance to stem rot was observed in several genotypes in repeated tests. These accessions may be useful as a source of resistance to R. solani in future breeding efforts.