Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris
One thousand and forty-eight Phaseolus bean accessions were evaluated for resistance to six races of Pseudomonas syringae pv. phaseolicola. The accessions originated from regions of the Americas and Africa where the disease is important and included wild type accessions and some known resistance sou...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
1996
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/44122 |
| _version_ | 1855534013600497664 |
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| author | Taylor, JD Teverson, D.M. Davis, J.H.C. |
| author_browse | Davis, J.H.C. Taylor, JD Teverson, D.M. |
| author_facet | Taylor, JD Teverson, D.M. Davis, J.H.C. |
| author_sort | Taylor, JD |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | One thousand and forty-eight Phaseolus bean accessions were evaluated for resistance to six races of Pseudomonas syringae pv. phaseolicola. The accessions originated from regions of the Americas and Africa where the disease is important and included wild type accessions and some known resistance sources. Resistance, graded on a five-point scale, was of two types: qualitative, which was shown to be race-specific, and quantitative. Race specific resistance genes (R-genes) were detected in 49.4% of accessions with the following gene frequencies: R1 (10.3%), R2 (0.3%), R3 (25.0%), R4 (35.0%) and R5 (0.2%).
Evidence for quantitative variation in resistance, in the absence of specific R-genes, was shown by the distribution of infection scores, 76% of accessions showing maximum susceptibility (grades 4 5), 23% showing intermediate resistance (grades 2 4), and 1% showing high levels of quantitative resistance (grades 1 2). The last 1% of accessions showed interactions which were not race-specific and it is suggested that they may possess race non-specific resistance. It is possible that several of the accessions in this category carry the recessive gene derived from PI 150414. Other accessions were of unknown parentage and may represent new sources of quantitative, potentially race non-specific, resistance. It is suggested that the combination of race specific and race non-specific resistance could provide an effective strategy for establishing durable resistance. |
| format | Journal Article |
| id | CGSpace44122 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1996 |
| publishDateRange | 1996 |
| publishDateSort | 1996 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace441222024-11-15T08:52:53Z Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris Taylor, JD Teverson, D.M. Davis, J.H.C. phaseolus vulgaris pseudomonas syringae disease resistance genes tropical zones resistencia a la enfermedad zona tropical One thousand and forty-eight Phaseolus bean accessions were evaluated for resistance to six races of Pseudomonas syringae pv. phaseolicola. The accessions originated from regions of the Americas and Africa where the disease is important and included wild type accessions and some known resistance sources. Resistance, graded on a five-point scale, was of two types: qualitative, which was shown to be race-specific, and quantitative. Race specific resistance genes (R-genes) were detected in 49.4% of accessions with the following gene frequencies: R1 (10.3%), R2 (0.3%), R3 (25.0%), R4 (35.0%) and R5 (0.2%). Evidence for quantitative variation in resistance, in the absence of specific R-genes, was shown by the distribution of infection scores, 76% of accessions showing maximum susceptibility (grades 4 5), 23% showing intermediate resistance (grades 2 4), and 1% showing high levels of quantitative resistance (grades 1 2). The last 1% of accessions showed interactions which were not race-specific and it is suggested that they may possess race non-specific resistance. It is possible that several of the accessions in this category carry the recessive gene derived from PI 150414. Other accessions were of unknown parentage and may represent new sources of quantitative, potentially race non-specific, resistance. It is suggested that the combination of race specific and race non-specific resistance could provide an effective strategy for establishing durable resistance. 1996-06 2014-10-02T08:33:16Z 2014-10-02T08:33:16Z Journal Article https://hdl.handle.net/10568/44122 en Limited Access Wiley |
| spellingShingle | phaseolus vulgaris pseudomonas syringae disease resistance genes tropical zones resistencia a la enfermedad zona tropical Taylor, JD Teverson, D.M. Davis, J.H.C. Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title | Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title_full | Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title_fullStr | Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title_full_unstemmed | Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title_short | Sources of resistance to Pseudomonas syringae pv. phaseolicola races in Phaseolus vulgaris |
| title_sort | sources of resistance to pseudomonas syringae pv phaseolicola races in phaseolus vulgaris |
| topic | phaseolus vulgaris pseudomonas syringae disease resistance genes tropical zones resistencia a la enfermedad zona tropical |
| url | https://hdl.handle.net/10568/44122 |
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