Severidad de Peronospora variabilis Gäum. en cinco variedades de Chenopodium quinoa Willd. en condiciones de La Molina

Héctor Andrés Ramírez Maguiña; Luz Leonor Mattos Calderón; Alejandro Risco Mendoza

doi:10.21704/ac.v81i2.1684

Authors

Héctor Andrés Ramírez Maguiña Facultad de Agronomía, Universidad Nacional Agraria La Molina, 15024, Lima, Perú. https://orcid.org/0000-0001-8324-7620
Luz Leonor Mattos Calderón Facultad de Agronomía, Universidad Nacional Agraria La Molina, 15024, Lima, Perú.
Alejandro Risco Mendoza Facultad de Agronomía, Universidad Nacional Agraria La Molina, 15024, Lima, Perú.

DOI:

https://doi.org/10.21704/ac.v81i2.1684

Keywords:

quinoa, Chenopodium quinoa, cultivars, downy mildew, severity, Peronospora variabilis

Abstract

The objective of this research was to evaluate the behavior of five commercial varieties of quinoa, naturally infected by P. variabilis. The study was carried out at the Universidad Nacional Agraria La Molina, Lima, Peru. The varieties studied were: Amarilla de Maranganí (AMR), Pasankalla (PAS), Negra Collana (NGR), Salcedo (SAL), and Altiplano (ALT). Treatments were distributed in a complete randomized block design with five repetitions. Variables evaluated include: yield (kg/ha), plant height (cm), disease severity using Area under Disease Progress Curve (AUDPC), protein content (%), weight of one thousand grains (g) and grain size (%). Comparisons of means were conducted using Tukey’s test, Pearson correlation coefficient analysis and statistical significance was set at p < 0,05. Results revealed statistics differences among treatments. The AMR variety had the highest yield (2628,1 kg/ha) followed by PAS (2201,9 kg/ha), NGR (1408,6 kg / ha), SAL (1244,4 kg / ha) and AL (649,2 kg/ha). The most susceptible variety to downy mildew was ALT (AUDPC = 4771,6), followed by SAL (4337,7), NGR (3796,3), PAS (3377,2) and AMR (2364,1). The correlation analysis of AUDPC showed a significant negative correlation with plant height (r = -0,94), yield (-0,88), and the percentage of large grains (-0,81). In conclusion, AMR was the variety with the best yield and the one that showed a high tolerance to downy mildew, while ALT had the lowest yield and was the most susceptible variety.

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