Evaluación de resistencia a tizón tardío (Phytophthora infestans) en clones de papa (Solanum tuberosum)

Abstract

The research work entitled "Evaluation of resistance to late blight (Phytophthora infestans) in potato clones (Solanum tuberosum)", was carried out with the aim of identifying clones that have greater resistance to late blight, which are: 11-8 -6; 11-9- 11; 11-9-186; 11-9-77; 11-9-133; 11-9-101; 11-9-106; 11-9-44; 11-9-108; 11-9-91, obtained in the National Institute of Agricultural Research INIAP, through the National Program of Roots and Tubers heading Papa (PNRT-Papa). The severity of late blight was quantified by the area under the disease progress curve (ABCPE), through various readings that began from the eighth week after planting, with a period of seven days between readings, through a visual assessment recording the percentage of leaf area affected, that is, the amount of foliage that have disease lesions against the entire plant, using the CIP scale. For the respective evaluation, a completely randomized experimental design was used with ten treatments, three repetitions, and four controls (resistant INIAP-FREEDOM, moderately resistant INIAP-NATIVITY, moderately susceptible SUPERCHOLA and susceptible CAPIRO), subsequently the analysis of variance ( ADEVA) and the data obtained were subjected to 1% Tukey significance tests, which facilitated the differentiation between the clones studied, the clones being moderately resistant to late blight: 11-9-11, 11-9-44, 11 -9-133, 11-9- 106, 11-9-108 and 11-9-186, with ABCPE averages of: 80.50; 83.18; 87.03; 118.65; 134.98 and 182.23 respectively, but of them the clone with the best performance was 11-9-133 with 20.7 tn / ha, so it would be the most optimal material for a release as a variety.