Respuesta a bajas temperaturas de treinta genotipos de papa (solanum spp.), bajo condiciones controladas. Cutuglahua, Pichincha
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Quito: Universidad Central del Ecuador, Facultad de Ciencias Agrícolas, Escuela de Ingeniería Agronómica, 2013. 70 p.
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E. E. Santa Catalina
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3 p.
Abstract
En Cutuglahua (Pichincha, Ecuador), a 3050 m.s.n.m, se evaluaron diez variedades nativas, ocho
mejoradas y doce clones promisorios de papa, las cuales se sometieron a tres temperaturas (3, 0 y -
3) °C durante 3 horas. Se utilizó un diseño completamente al azar (DCA) con un arreglo factorial
30 x 3 con 5 observaciones, se empleó un fítotrón para la aplicación de las temperaturas, las
variables evaluadas fueron: Contenido de Clorofila (CC) 10 días antes y 10 días después del estrés,
Contenido Relativo de Agua en las hojas (CRA) y Nivel de Daño (ND). Los principales resultados
fueron: Para CC 10 días antes, el genotipo con el mayor promedio fue el clon 98-2-6 con 50.72
unidades SPAD (USP) y 10 días después la variedad Wagra Singa con 42.31 (USP). Para la
variable CRA la variedad nativa Uvilla obtuvo el mayor promedio con 76.01%. En la variable ND
los genotipos con el menor promedio (grado 0) fueron la variedad nativa Uvilla y el clon 97-25-3.
Se recomienda realizar ensayos en campo en zonas con heladas frecuentes con los genotipos
Uvilla, Tushpa, INIAP-Victoria, INIAP-Puca Shungo, INIAP-Yana Shungo, INIAP-Fripapa,
Superchola, 97-25-3, 00-24-1, 99-99-2 y 399062-115.
In Cutuglahua (Pichincha, Ecuador), at 3050 m.a.s.l, 10 native varieties, 8 improved and 12 promising clones of potato were assessed. These were subjected to three different temperatures: 3, 0, and -3 °C during a period of 3 hours in a phytotron. A factorial 30x3 was implemented on a completely randomized design with 5 observations. The variables assessed were: (i) Chlorophyll Content (CC) 10 days before and 10 days after the stress, (ii) Relative Water Content in the leaves (RWC), and (iii) Level of Damage (ND). The main results were: (i) for CC 10 days before the stress, the genotype with the highest average was the clone 98-2-6 with 50.72 SPAD units (USP), the variety Wagra Singa showed the highest average (42.31 USP) 10 days after the stress, (ii) Uvilla (Native) showed the highest average (76.01%) for the variable RWC, (iii) in the variable ND, Uvilla and clone 97-25-3 showed the lowest frost damage average (grade 0). In future researches the genotypes: Uvilla, Tushpa, 1N1AP-Victoria, lNlAP-Puca Shungo, INIAP-Yana Shungo, INIAP-Fripapa, Superchola, 97-25-3, 00-24-1, 99-99-2 and 399062-115, need to be assessed under field condition in areas where frost is common.
In Cutuglahua (Pichincha, Ecuador), at 3050 m.a.s.l, 10 native varieties, 8 improved and 12 promising clones of potato were assessed. These were subjected to three different temperatures: 3, 0, and -3 °C during a period of 3 hours in a phytotron. A factorial 30x3 was implemented on a completely randomized design with 5 observations. The variables assessed were: (i) Chlorophyll Content (CC) 10 days before and 10 days after the stress, (ii) Relative Water Content in the leaves (RWC), and (iii) Level of Damage (ND). The main results were: (i) for CC 10 days before the stress, the genotype with the highest average was the clone 98-2-6 with 50.72 SPAD units (USP), the variety Wagra Singa showed the highest average (42.31 USP) 10 days after the stress, (ii) Uvilla (Native) showed the highest average (76.01%) for the variable RWC, (iii) in the variable ND, Uvilla and clone 97-25-3 showed the lowest frost damage average (grade 0). In future researches the genotypes: Uvilla, Tushpa, 1N1AP-Victoria, lNlAP-Puca Shungo, INIAP-Yana Shungo, INIAP-Fripapa, Superchola, 97-25-3, 00-24-1, 99-99-2 and 399062-115, need to be assessed under field condition in areas where frost is common.