Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae
This study evaluated the types of gene action governing the inheritance of resistance to Phytophthora nicotianae necrosis in populations derived from two crosses involving two susceptible (Beldi and Nabeul II) and one resistant (CM334) cultivars of pepper (Capsicum annuum L.). Populations, composed...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Genética
2010-01-01
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| Series: | Genetics and Molecular Biology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200014 |
| _version_ | 1811280285680009216 |
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| author | Fethi Bnejdi Morad Saadoun Mohamed Bechir Allagui Colin Hanbury Mohamed El Gazzah |
| author_facet | Fethi Bnejdi Morad Saadoun Mohamed Bechir Allagui Colin Hanbury Mohamed El Gazzah |
| author_sort | Fethi Bnejdi |
| collection | DOAJ |
| description | This study evaluated the types of gene action governing the inheritance of resistance to Phytophthora nicotianae necrosis in populations derived from two crosses involving two susceptible (Beldi and Nabeul II) and one resistant (CM334) cultivars of pepper (Capsicum annuum L.). Populations, composed of Pr, Ps, F1,F2,BC1Pr, and BC1Ps generations, were inoculated with six P. nicotianae isolates. Generation means analysis indicated that an additive-dominance model was appropriate for P. nicotianae isolates PnKo1,PnKo2 and PnKr1, which showed low aggressiveness in the two crosses. For the more aggressive isolates PnBz1,PnBz2 and PnKr2, epistasis was an integral component of resistance in the two crosses. The presence of epistasis in the resistance of pepper to P. nicotianae was dependent on the level of aggressiveness of the isolates. Selection in pepper with less aggressive isolates was efficient, but not with more aggressive isolates; on the other hand, selection with more aggressive isolates was more stable. The minimum number of genes controlling resistance was estimated at up to 2.71. In the majority of cases, the additive variance was significant and greater than the environmental and dominance variance. |
| first_indexed | 2024-04-13T01:12:03Z |
| format | Article |
| id | doaj.art-4c10365218e94142925541d8fccfea8a |
| institution | Directory Open Access Journal |
| issn | 1415-4757 1678-4685 |
| language | English |
| last_indexed | 2024-04-13T01:12:03Z |
| publishDate | 2010-01-01 |
| publisher | Sociedade Brasileira de Genética |
| record_format | Article |
| series | Genetics and Molecular Biology |
| spelling | doaj.art-4c10365218e94142925541d8fccfea8a2022-12-22T03:09:07ZengSociedade Brasileira de GenéticaGenetics and Molecular Biology1415-47571678-46852010-01-01332279284Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianaeFethi BnejdiMorad SaadounMohamed Bechir AllaguiColin HanburyMohamed El GazzahThis study evaluated the types of gene action governing the inheritance of resistance to Phytophthora nicotianae necrosis in populations derived from two crosses involving two susceptible (Beldi and Nabeul II) and one resistant (CM334) cultivars of pepper (Capsicum annuum L.). Populations, composed of Pr, Ps, F1,F2,BC1Pr, and BC1Ps generations, were inoculated with six P. nicotianae isolates. Generation means analysis indicated that an additive-dominance model was appropriate for P. nicotianae isolates PnKo1,PnKo2 and PnKr1, which showed low aggressiveness in the two crosses. For the more aggressive isolates PnBz1,PnBz2 and PnKr2, epistasis was an integral component of resistance in the two crosses. The presence of epistasis in the resistance of pepper to P. nicotianae was dependent on the level of aggressiveness of the isolates. Selection in pepper with less aggressive isolates was efficient, but not with more aggressive isolates; on the other hand, selection with more aggressive isolates was more stable. The minimum number of genes controlling resistance was estimated at up to 2.71. In the majority of cases, the additive variance was significant and greater than the environmental and dominance variance.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200014additive modelbest fit modelgene effectheredity |
| spellingShingle | Fethi Bnejdi Morad Saadoun Mohamed Bechir Allagui Colin Hanbury Mohamed El Gazzah Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae Genetics and Molecular Biology additive model best fit model gene effect heredity |
| title | Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae |
| title_full | Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae |
| title_fullStr | Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae |
| title_full_unstemmed | Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae |
| title_short | Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L.) to Phytophthora nicotianae |
| title_sort | relationship between epistasis and aggressiveness in resistance of pepper capsicum annuum l to phytophthora nicotianae |
| topic | additive model best fit model gene effect heredity |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200014 |
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