Abstract

ACOSTA-GALLEGOS, Jorge Alberto et al. ‘San Blas’: a variety of Negro Opaco beans resistant to BCMV and BCMNV for Nayarit and The Bajío of Guanajuato. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.7, pp.1701-1707.  Epub Nov 29, 2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i7.1963.

A new variety of beans is described, ‘San Blas’, whose main characteristics are its type of grain in high demand in Mexico and its resistance to the common bean mosaic virus (BCMV) and the mosaic virus and common bean necrosis (BCMNV), since it has the combination of genes II + bc-3. San Blas was derived from the cross between Jamapa Plus/XRAV-187-3. The final selection of the line that gave rise to San Blas was carried out by inoculation with the necrotic strain BCMNV NL-3, and genotyping with the molecular markers (MMs) SW13 and ENM, associated with genes II and bc-3, respectively. The San Blas plant has an indeterminate, semi-erect type II habit, with lilac-purple flowers, straw-colored pods at maturity and Negro Opaco grain, oval in shape and small in size similar to Jamapa. In the Bajío, its flowering and physiological maturity occur around 45 and 92 days after sowing (dds); while in Nayarit at 40 and 80 dds, respectively. After selection with MMs and inoculation, the average yield of San Blas in six different environments in Guanajuato was 1841 kg ha-1, 12% more than that of Negro 8025; while in three residual moisture environments in Nayarit it was 1 927 kg ha-1, surpassing the Jamapa and Coranay varieties by 50 and 36%, respectively.

Keywords : Phaseolus vulgaris L.; residual moisture; virus resistance BCMV and BCMNV.

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