Origin of the Black Shank Resistance Gene, Ph, in Tobacco Cultivar Coker 371-Gold

Plant Disease
E S JohnsonH D Shew

Abstract

Flue-cured tobacco (Nicotiana tabacum) cultivar Coker 371-Gold (C 371-G) possesses a dominant gene, Ph, that confers high resistance to black shank disease, caused by race 0 of the soil-borne pathogen Phytophthora parasitica var. nicotianae. The origin of this gene is unknown. Breeding lines homozygous for the Ph gene were hybridized with NC 1071 and L8, flue-cured and burley genotypes known to possess qualitative resistance genes from Nicotiana plumbaginifolia and N. longiflora, respectively. The F1 hybrids were out-crossed to susceptible testers and the progenies evaluated in field black shank nurseries and in greenhouse disease tests with P. parasitica var. nicotianae race 0. Results showed that Ph was allelic to Php from N. plumbaginifolia in NC 1071. Testcross populations of hybrids between burley lines homozygous for Ph and L8, possessing Phl from N. longiflora, showed that Ph and Phl integrated into the same tobacco chromosome during interspecific transfer. Nevertheless, the two loci were estimated to be 3 cM apart. Random amplified polymorphic DNA (RAPD) analyses of the testcross progenies confirmed that recombination between the two loci was occurring. Forty-eight RAPD markers linked to Ph in doubled haploid lines were...Continue Reading

References

Nov 25, 1990·Nucleic Acids Research·J G WilliamsS V Tingey
Mar 1, 1974·Australasian Radiology·J A Holt
Jun 1, 1997·Annual Review of Plant Physiology and Plant Molecular Biology·Kim E. Hammond-Kosack, Jonathan D. G. Jones
Dec 1, 1995·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·D BaiJ E Brandie
Apr 1, 1995·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·E JohnsonJ C Martinez-Cruzado

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Citations

Jan 17, 2020·Briefings in Functional Genomics·Kaleem U KakarXueliang Ren
Jul 19, 2012·The Plant Journal : for Cell and Molecular Biology·Manuela D BienertMarc Boutry
Aug 1, 2007·Plant Disease·Walter A Gutiérrez, Asimina L Mila
Mar 7, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Ramsey S Lewis, S P Kernodle
Apr 21, 2016·Journal of Biological Research·Ni LongYang Dong
Nov 1, 2005·Plant Disease·M J SullivanH D Shew

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