Phaseolus vulgaris line A193 has been shown to be widely resistant to Colletotrichum lindemuthianum, including race 1472, one of the most virulent races of C. lindemuthianum characterized. Resistance to C. lindemuthianum race 1472 in P. vulgaris line A193 was investigated in segregating F2 and F2.3 populations from a cross between A193 and Flor de Mayo Bajio (a commercial cultivar highly susceptible to C. lindemuthianum). Resistance to 1472 in A193 was determined to be conditioned by a single dominant gene. Inoculation of crosses between A193 and cultivars Michigan Dark Red Kidney and Perry Marrow with race 1472 suggest that resistance in A193 is conditioned by the Co-1 gene. Inoculation of the cross A193 × Perry Marrow with C. lindemuthianum race 2, demonstrated that resistance to race 2 in Perry Marrow is also conditioned by a single dominant gene and is distinct to resistance in A193 or Michigan Dark Red Kidney. Three AFLP markers (ECAG/MACC-1, EACA/MAGA-2, EAGG/MAAC-8) linked in repulsion to the Co-1 locus were identified by screening the A193 × Flor de Mayo F2 population with 314 random amplified polymorphic DNA, amplified fragment length polymorphism, and restriction fragment length polymorphism markers. The two most closely linked markers should be useful in marker-assisted selection for Co-1.
El presente estudio evaluó la calidad del agua de la cuenca río Huacamarcanga, ubicado en la sierra del norte peruano durante los meses de junio (época de estiaje) y diciembre (época de lluvias); del año 2017, para ello, se utilizó como indicadores a los macroinvertebrados bentónicos, el Índice BMWP (Biological Monitoring Working Party) adaptado para norte de Perú y parámetros fisicoquímicos: temperatura (grados centígrados), pH (cantidad de iones de hidrógeno), oxígeno disuelto (mg/L),conductibilidad eléctrica (μS/cm), fosfatos (mg/L), sulfatos (mg/L). Se establecieron 4 puntos de muestreo a lo largo de la cuenca (entre los 3780 a 3725 m.s.n.m). Los resultados mostraron una calidad de agua variable entre buena a crítica en época de estiaje y de aceptable a crítica en época lluviosa; los parámetros fisicoquímicos cumplieron con los Estándares de Calidad Ambiental (ECAs) para Categoría 3 y 4 establecidos en el DS N°004-2017 MINAM. Palabras claves: Calidad de agua, río Huacamarcanga, bioindicadores, Estándares de Calidad Ambiental (ECA).
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