Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz)
Varietal resistance is one of the main tools for managing root rots in cassava, caused by different Phytophthora species, and it is therefore necessary to understand the complexity of the genetic base of this crop. The resistance of parents and progeny of cassava families K (M Nga 2 x CM 2177-2) and...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | Español |
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2002
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| Online Access: | https://hdl.handle.net/10568/44333 |
| _version_ | 1855525954395308032 |
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| author | Álvarez, E. Loke, J Rivera, S. Llano Rodríguez, Germán Alberto |
| author_browse | Llano Rodríguez, Germán Alberto Loke, J Rivera, S. Álvarez, E. |
| author_facet | Álvarez, E. Loke, J Rivera, S. Llano Rodríguez, Germán Alberto |
| author_sort | Álvarez, E. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Varietal resistance is one of the main tools for managing root rots in cassava, caused by different Phytophthora species, and it is therefore necessary to understand the complexity of the genetic base of this crop. The resistance of parents and progeny of cassava families K (M Nga 2 x CM 2177-2) and CM 9582 (M Bra 1045 x M Cr 81) to Phytophthora tropicalis was evaluated accordingly. Fresh roots of 69 individuals of family K and 43 of family CM 9582 were also inoculated, in addition to the parental materials of each family. Based on the phenotypic evaluation and the molecular map of M Nga 2 (female parent of family K), QTLs associated to the resistance to P. tropicalis were identified and mapped, using simple marker analysis. Cassava family K genotypes, evaluated during 2000 and 2001, showed a percentage of infected root area between 22% and 95%. The correlation between the evaluations of 2000 and 2001 was -0.15. Cassava family CM 9582 genotypes showed an infected area between 70% and 90%. The distribution of frequency of cassava family K genotypes, based on root area affected by P. tropicalis, corresponds to a normal distribution, with one genotype presenting moderate resistance in both years of evaluation, 50 genotypes susceptible, and 17 genotypes highly susceptible. Eight QTLs were defined, two of which accounted for 8.6% and 9% of phenotypic variance. Minor genes were found to control resistance to P. tropicalis. |
| format | Journal Article |
| id | CGSpace44333 |
| institution | CGIAR Consortium |
| language | Español |
| publishDate | 2002 |
| publishDateRange | 2002 |
| publishDateSort | 2002 |
| record_format | dspace |
| spelling | CGSpace443332025-11-12T05:55:32Z Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) Álvarez, E. Loke, J Rivera, S. Llano Rodríguez, Germán Alberto manihot esculenta phytophthora root rots genetic resistance inoculation phytophthora tropicalis podredumbre de la raíz resistencia genética inoculación Varietal resistance is one of the main tools for managing root rots in cassava, caused by different Phytophthora species, and it is therefore necessary to understand the complexity of the genetic base of this crop. The resistance of parents and progeny of cassava families K (M Nga 2 x CM 2177-2) and CM 9582 (M Bra 1045 x M Cr 81) to Phytophthora tropicalis was evaluated accordingly. Fresh roots of 69 individuals of family K and 43 of family CM 9582 were also inoculated, in addition to the parental materials of each family. Based on the phenotypic evaluation and the molecular map of M Nga 2 (female parent of family K), QTLs associated to the resistance to P. tropicalis were identified and mapped, using simple marker analysis. Cassava family K genotypes, evaluated during 2000 and 2001, showed a percentage of infected root area between 22% and 95%. The correlation between the evaluations of 2000 and 2001 was -0.15. Cassava family CM 9582 genotypes showed an infected area between 70% and 90%. The distribution of frequency of cassava family K genotypes, based on root area affected by P. tropicalis, corresponds to a normal distribution, with one genotype presenting moderate resistance in both years of evaluation, 50 genotypes susceptible, and 17 genotypes highly susceptible. Eight QTLs were defined, two of which accounted for 8.6% and 9% of phenotypic variance. Minor genes were found to control resistance to P. tropicalis. Una de las principales herramientas para el manejo de pudriciones radicales causadas por diversas especies de Phytophthora, es el uso de resistencia varietal, para lo cual se hace necesario entender la complejidad de la base genética de la yuca. Con este propósito, se evalué la resistencia de los padres y las progenies de las familias de yuca K (M Nga 2 x CM 2177-2) y CM 9582 (M Bra 1045 x M Cr 81), a Phytophthora tropicalis. Además de los parentales de cada familia, se inocularon raíces frescas de 69 individuos de la familia K y 43 de la familia CM 9582. Con la evaluación fenotípica y con base en el mapa molecular de M Nga 2, madre de la familia K, se identificaron y mapearon QTLs asociados a la resistencia a P. tropicalis, mediante análisis de marcador simple. Los genotipos de yuca de la familia K, evaluados durante los años 2000 y 2001 mostraron un porcentaje de área de raíz afectada entre el 22% y 95%. La correlación entre las evaluaciones de los años 2000 y 2001, fue 0.15. Los genotipos de yuca de la familia CM 9582, mostraron un área afectada entre 70% y 9O%. La distribución de la frecuencia de los genotipos de yuca de la familia K de acuerdo al área de raíz afectada por P. fropicalis, corresponde a una distribución normal, con un genotipo que presenta resistencia moderada en los dos años de evaluación, 50 genotipos susceptibles y 17 genotipos altamente susceptibles. Se definieron ocho QTLs, dos de los cuales explicaron entre 8.6% y 9% de la varianza fenotipica. Se demostró que genes menores controlan la resistencia a P. tropicalis. 2002 2014-10-02T08:33:36Z 2014-10-02T08:33:36Z Journal Article https://hdl.handle.net/10568/44333 es Open Access application/pdf |
| spellingShingle | manihot esculenta phytophthora root rots genetic resistance inoculation phytophthora tropicalis podredumbre de la raíz resistencia genética inoculación Álvarez, E. Loke, J Rivera, S. Llano Rodríguez, Germán Alberto Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title | Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title_full | Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title_fullStr | Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title_full_unstemmed | Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title_short | Genética de la resistencia a pudrición causada por Phytophthora tropicalis en dos poblaciones segregantes de yuca (Manihot esculenta Crantz) |
| title_sort | genetica de la resistencia a pudricion causada por phytophthora tropicalis en dos poblaciones segregantes de yuca manihot esculenta crantz |
| topic | manihot esculenta phytophthora root rots genetic resistance inoculation phytophthora tropicalis podredumbre de la raíz resistencia genética inoculación |
| url | https://hdl.handle.net/10568/44333 |
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