Selection of potato genotypes with tolerance to internal browning associated with purple top in the field and Bactericera cockerelli in the greenhouse
DOI:
https://doi.org/10.47808/revistabioagro.v1i2.237Keywords:
Solanum tuberosum, Phytoplasmas, Bactericera cockerelli, Liberibacter solanacearum, Internal browning in tubersAbstract
In order to select potato genotypes tolerant to internal browning in tubers under greenhouse conditions during summer 2012, 296 potato genotypes were evaluated against Bactericera cockerelli and its effect was determined and compared, in the same genotypes, to previous potato purple top field evaluations. Four plants per genotype were introduced inside the cages. After 30 days “Mixquic” pepper plants, infested with different stages of the insect were also introduced. Adults were quantified -30 days after-using sticky yellow traps, and for the nymphs, visual inspection with the microscope - of five detached leaves per genotype 45 days after- was carried on. Molecular analyses of the insects with specific primers for diagnosis of phytoplasma and Ca. Liberibacter solanacearum were done. Yield and data of internal browning in tubers per genotype were registered and taken as selection criteria. Response data of these variables, induced by the insect, were compared with the ones- previously- obtained in the field to determine if there was some kind of correlation. The registered B. cockerelli adult population (4-225) per quadrant and nymphs (11-507) per plant assured insect colonization over each proven genotype. The psyllid colony turned out to be positive to Ca. Liberibacter solanacearum. From the 296 evaluated genotypes in the greenhouse, 21 were selected with yields higher than 80 gr/plant and tolerant to internal browning in tubers; their assessments were from very low to low. In 61% of the evaluated genotypes, variables of yield and internal browning in tubers, under greenhouse and field conditions, were similar.
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Copyright (c) 2013 Margarita Díaz Valasis, Mateo Armando Cadena Hinojosa, Isidro Humberto Almeyda Leon, Juana Rocío Carrillo Ramírez, Claudia Arriaga Camarena y Obdulia Segura León
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