| Abstract Detail
Breeding and Genetics Rivera-Peña, Antonio [1], Parga-Torres, V.M. [2], Garzon-Tiznado, J.A. [3], Almeyda-Leon, H.I. [4], Rocha-Rodriguez, R [5]. A Two Years Evaluation of Resistance Against the Complex Purple Top Disease in Potatoes in Mexico. PURPLE top disease has become a serious threat on potato production in Mexico.Reports of similar disease, but not strictly the same, have been observed in the Northwestern of USA. In that system the vectors of the disease; Bactericerca (Paratrioza) cockerelii, Empoasca spp and others play an important role. The work was carried out in the Toluca Valley Experimental Station of the National Institute for Agricultural, Forestry and Livestock Research during 2004 and 2005. The genetic material was constitued by a population of 1198 genotypes in 2004 and 1598 in 2005. Tubers free of diseases were planted for field evaluations and plants were exposed to the disease in the field without any chemical protection . A monitoring of the vectors was made. Observations on symptoms in the foliage and vigor of the plants also were made. The purple top damage was measured by assessing internal tuber at the harvest . A scale of four categories indicating different intensities of the coloration was used, 0=no symptoms, L=low, M= moderate and H= high. Results of 2004 indicated that only 19 genotypes (1.6%) showed no symptoms compared to 187 genotypes (11.7%) with no symptoms in 2005. The presence of phtyoplasma in plants was checked in the resistant clones by using molecular biology techniques. Those 195 analyzed clones were positive except one. Another 50 clones were analyzed in a different laboratory, a series of them were positive, and eight clones did not show any necrosis in the tuber flesh. These results sugest that a small population of potato genotypes possess tolerance factors against the complex purple top disease. Further investigation is underway.
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Related Links:
European Association for Potato Reseaarch
1 - Instituo nacional de Investigaciones Forestales Agricolas y Pecuarias, Campo Experimental Valle de Toluca, Programa de Papa, Vial. Adolfo Lopez Mateos s/n, -, Zinacantepec, Mexico, 51350, Mexico
2 - Instituo nacional de Investigaciones Forestales Agricolas y Pecuarias, Papa, Islas CArolinas No. 665, Fraccionamiento Oceania, -, Saltillo, Coahuila, ---, Mexico
3 - Instituo nacional de Investigaciones Forestales Agricolas y Pecuarias, Biotecnologia, Km. 16.0 Carr. Culiacan -El Dorado, --, Culiacan, Sinaloa, 00000, Mexico
4 - Instituo nacional de Investigaciones Forestales Agricolas y Pecuarias, Biotecnologia, Facultad de Ciencia Biologicas, Universidad de Nuevo Leon, --, Monterrey, Nuevo Leon, 0000, Mexico
5 - Instituto Nacional de Invesstigaciones Forestaales, Agricolas y Pecuar, Campo Experimental Bajio, Programa de papa, Km 3.5 Carr Calaya-San Miguel de Allende, --, Celaya, Guabajuato, 00000, Mexico
Keywords:
none specified
Session: PAA09-6
Location: Hall of Ideas Room G/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 2:45 PM
Abstract ID:351 |
