Abstract
Phurejas potatoes (Solanum phureja Juz et Buk) are cultivated in very restricted areas of the Bolivian Andes. Late blight caused by Phytophthora infestans is a destructive, endemic disease that affects the survival and cultivation of this crop. The aim of this study was to determine the resistance characteristics of phurejas potato varieties to P. infestans in a traditional area of cultivation. An experimental plot was prepared in the locality of Chojchoni (3200 m) and planted with different phurejas varieties: 1) Chojllu Phureja (Sste); 2) Phureja Amarilla (Sphu); 3) Polo Phureja (Sphu); 4) Phureja Roja (Sphu); 5) Phureja Negra (Sphu) and 6) Waych’a Pacena (Sadg), a susceptible control. Severity was assessed according to the criteria of the Centro Internacional dela Papa, determining the area under the disease progress curve (AUDPC). Regression analysis (logN disease severity against time) was performed using the logistic model [ln(y/1 - y)] to determine infection rates. The different varieties showed different levels of resistance. The disease progress curve, the AUDPC and the linear regression results revealed the varieties Chojllu Phureja, Phureja Amarilla and Polo Phureja to likely have larger copy numbers of minor resistance genes against P. infestans than Phureja Roja or Phureja Negra. Late blight caused by P. infestans could cause the long-term loss of some phurejas varieties through farmers selecting others less severely affected by the disease.
Highlights
Phurejas potatoes (Solanum phureja Juz et Buk) are grown in the Provinces of Larecaja, Camacho, Muñecas and Bautista Saavedra in the north of the Dept. of La Paz in the Bolivian Andes
The Waych’a Paceña plants showed a disease severity of 70% within 35 days, while the phurejas potatoes fell into two severity groups, one with scores similar to the control (Chojllu Phureja, Phureja Amarilla and Polo Phureja), and the other with much lower scores (Phureja Roja and Phureja Negra) (Figure 2(a))
The area under the disease progress curve (AUDPC) for the phurejas potatoes fell into two groups, one formed by the varieties Chojllu Phureja, Phureja Amarilla and Polo Phureja plus the control Waych’a Paceña, and the other formed by Phureja Roja and Phureja Negra (F0.05)
Summary
Phurejas potatoes (Solanum phureja Juz et Buk) are grown in the Provinces of Larecaja, Camacho, Muñecas and Bautista Saavedra in the north of the Dept. of La Paz in the Bolivian Andes. These areas lie between altitudes of 3200 and 4000 m, their soils rich in organic matter. Their climates are strongly influenced by the La Paz Mountains and range from cold to temperate, all have high humidity and suffer permanent cloudiness. Cárdenas [1] indicated phurejas potatoes to come from Ilabaya, close to Sorata, and from the Yungas highlands in the Chojlla region According to Hawkes and Hjerting [3], and to Ochoa [4], the greatest diversity of S
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