‘San Luis 22’: variedad de frijol negro brillante de temporal para el centro-norte de México

‘San Luis 22’ is a medium-sized variety of shiny black beans, it has a prostrate type III indeterminate habit. It has an intermediate maturity cycle, with 95 to 100 days to physiological maturity. Its potential yield under rainfed conditions is 1 450 kg ha-1. In El Bajío, in field plantings, it is tolerant to common blight and resistant to rust, anthracnose, halo blight, and bean common mosaic. It has the following molecular markers: SW13, associated with the I gene of resistance to the bean common mosaic virus; Sk14, SI19 and SAD12, associated with the rust resistance genes Ur-3, Ur-5, and Ur-7; and SY20, SAS13, and SF10, associated with the anthracnose resistance genes Co-4, Co-4 2 , and Co-10, respectively. ‘San Luis 22’ is recommended for rainfed conditions in El Bajío and the Altiplano of northern Guanajuato, Querétaro, San Luis Potosí, and Zacatecas. In El Bajío and northern Guanajuato, under rainfed conditions, ‘San Luis 22’ exceeded Negro Otomí by 191 kg ha-1, particularly in late sowing in August, which suggested greater phenological plasticity.