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Genetic analysis of seedling resistance to Stagonospora nodorum blotch in selected tetraploid and hexaploid wheat genotypes
Author(s) -
Singh P. K.,
Feng J.,
Mergoum M.,
McCartney C. A.,
Hughes G. R.
Publication year - 2009
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2008.01576.x
Subject(s) - biology , genotype , plant disease resistance , inoculation , poaceae , gene , gene pool , seedling , fungi imperfecti , ploidy , botany , genetics , horticulture , genetic diversity , population , demography , sociology
Stagonospora nodorum blotch (SNB), caused by Phaeosphaeria nodorum , is a major component of the leaf‐spotting disease complex of wheat ( Triticum aestivum L.) in the northern Great Plains of North America. This study was conducted, under controlled environmental conditions, to determine the inheritance of resistance to SNB in a diverse set of hexaploid and tetraploid wheat genotypes and to decipher the genic/allelic relationship among the resistance gene(s). Plants were inoculated at the two to three‐leaf stages with a spore suspension of P. nodorum isolate Kelvington‐SK and disease reaction was assessed 8 days after inoculation based on a lesion‐type scale. Tests of the F 1 and F 2 generations and of F 2 : 3 or F 2 : 5 families indicated that a single recessive gene controlled resistance to SNB in both hexaploid and tetraploid resistance sources. Lack of segregation in intra‐specific and inter‐specific crosses between the hexaploid and the tetraploid resistant genotypes, indicated that these genetically diverse sources of resistance possess the same gene for resistance to SNB. Results of this study suggest that the wheat‐ P. nodorum interaction may follow the toxin model of the gene‐for‐gene hypothesis.