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Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean

Anthracnose (Colletotrichum lindemuthianum), Angular leaf spot (Pseudocercospora griseola) and Pythium root rot are important pathogens affecting common bean production in the tropics. A promising strategy to manage these diseases consists of combining several resistance (R) genes into one cultivar....

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Autores principales: Okii, Dennis, Badji, Arfang, Odong, Thomas, Talwana, Herbert, Tukamuhabwa, Phinehas, Male, Allan, Mukankusi, Clare, Gepts, Paul
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Academic Journals 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7672375/
https://www.ncbi.nlm.nih.gov/pubmed/33281892
http://dx.doi.org/10.5897/AJB2019.16776
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author Okii, Dennis
Badji, Arfang
Odong, Thomas
Talwana, Herbert
Tukamuhabwa, Phinehas
Male, Allan
Mukankusi, Clare
Gepts, Paul
author_facet Okii, Dennis
Badji, Arfang
Odong, Thomas
Talwana, Herbert
Tukamuhabwa, Phinehas
Male, Allan
Mukankusi, Clare
Gepts, Paul
author_sort Okii, Dennis
collection PubMed
description Anthracnose (Colletotrichum lindemuthianum), Angular leaf spot (Pseudocercospora griseola) and Pythium root rot are important pathogens affecting common bean production in the tropics. A promising strategy to manage these diseases consists of combining several resistance (R) genes into one cultivar. The aim of the study was to determine genetic linkage between gene pairs, Co-4(2)/Phg-2, on bean-chromosome Pv08 and Co-5/“P.ult” on-chromosome Pv07, to increase the efficiency of dual selection of resistance genes for major bean diseases, with molecular markers. The level of recombination was determined by tracking molecular markers for both BC3F6 and F2 generations. Recombination fraction r, among gene pairs, the likelihood of linkage, L(r), and logarithm of odds (LOD) scores were computed using the statistical relationship of likelihood which assumes a binomial distribution. The SCAR marker pair SAB3/PYAA19 for the gene pair Co-5/“P.ult” exhibited moderate linkage (r = 32 cM with a high LOD score of 9.2) for BC(3)F(6) population, but relatively stronger linkage for the F(2) population (r = 21 cM with a high LOD score of 18.7). However, the linkage among SCAR marker pair SH18/SN02, for the gene pair Co-4(2)/Phg-2 was incomplete for BC(3)F(6) population (r = 47 cM with a low LOD score of 0.16) as well as F(2) population (r = 44 cM with a low LOD score of 0.7). Generally, the weak or incomplete genetic linkage between marker pairs studied showed that all the four genes mentioned earlier have to be tagged with a corresponding linked marker during selection. The approaches used in this study will contribute to two loci linkage mapping techniques in segregating plant populations.
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spelling pubmed-76723752020-12-04 Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean Okii, Dennis Badji, Arfang Odong, Thomas Talwana, Herbert Tukamuhabwa, Phinehas Male, Allan Mukankusi, Clare Gepts, Paul Afr J Biotechnol Full Length Research Paper Anthracnose (Colletotrichum lindemuthianum), Angular leaf spot (Pseudocercospora griseola) and Pythium root rot are important pathogens affecting common bean production in the tropics. A promising strategy to manage these diseases consists of combining several resistance (R) genes into one cultivar. The aim of the study was to determine genetic linkage between gene pairs, Co-4(2)/Phg-2, on bean-chromosome Pv08 and Co-5/“P.ult” on-chromosome Pv07, to increase the efficiency of dual selection of resistance genes for major bean diseases, with molecular markers. The level of recombination was determined by tracking molecular markers for both BC3F6 and F2 generations. Recombination fraction r, among gene pairs, the likelihood of linkage, L(r), and logarithm of odds (LOD) scores were computed using the statistical relationship of likelihood which assumes a binomial distribution. The SCAR marker pair SAB3/PYAA19 for the gene pair Co-5/“P.ult” exhibited moderate linkage (r = 32 cM with a high LOD score of 9.2) for BC(3)F(6) population, but relatively stronger linkage for the F(2) population (r = 21 cM with a high LOD score of 18.7). However, the linkage among SCAR marker pair SH18/SN02, for the gene pair Co-4(2)/Phg-2 was incomplete for BC(3)F(6) population (r = 47 cM with a low LOD score of 0.16) as well as F(2) population (r = 44 cM with a low LOD score of 0.7). Generally, the weak or incomplete genetic linkage between marker pairs studied showed that all the four genes mentioned earlier have to be tagged with a corresponding linked marker during selection. The approaches used in this study will contribute to two loci linkage mapping techniques in segregating plant populations. Academic Journals 2019-09-30 2019 /pmc/articles/PMC7672375/ /pubmed/33281892 http://dx.doi.org/10.5897/AJB2019.16776 Text en © 2019 The Author(s) retain the copyright of this article http://creativecommons.org/licenses/by/4.0/ Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License
spellingShingle Full Length Research Paper
Okii, Dennis
Badji, Arfang
Odong, Thomas
Talwana, Herbert
Tukamuhabwa, Phinehas
Male, Allan
Mukankusi, Clare
Gepts, Paul
Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title_full Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title_fullStr Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title_full_unstemmed Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title_short Recombination fraction and genetic linkage among key disease resistance genes (Co-4(2)/Phg-2 and Co-5/“P.ult”) in common bean
title_sort recombination fraction and genetic linkage among key disease resistance genes (co-4(2)/phg-2 and co-5/“p.ult”) in common bean
topic Full Length Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7672375/
https://www.ncbi.nlm.nih.gov/pubmed/33281892
http://dx.doi.org/10.5897/AJB2019.16776
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