Abstract

VELASQUEZ-CARDELAS, Gustavo Adrián; PEREZ-MENDOZA, Claudia  and  VAZQUEZ-CARRILLO, María Gricelda. H-77: a white grain corn hybrid for the High Valleys of Mexico. Rev. Mex. Cienc. Agríc [online]. 2025, vol.16, n.2, e3788.  Epub June 30, 2025. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v16i2.3788.

In the High Valleys of Mexico, 1.8 million hectares are planted with corn, of which 51% correspond to rainfed conditions. In recent years, the occurrence of rain has been delayed, reducing the growing season, a condition that requires corn hybrids with a shorter cycle that reduces the risk of damage from early frosts and that continue to conserve production potential. In 2013, the H-77 trilinear hybrid was identified due to its earliness and good yield, it adapts very well to the Region of the High Valleys of the Central Mexican Plateau, at altitudes of 2 250 to 2 600 m, in areas with irrigation, irrigation tip, residual moisture, and rainfed conditions. H-77 is a tall hybrid with an early intermediate cycle (160 to 170 days to maturity). It showed a plant height that varies from 210 to 240 cm and an ear height from 90 to 100 cm. The plant lodging shown by H-77 ranged from 3 to 12%, which represents minimal to moderate lodging values. Likewise, H-77 showed greater tolerance to common rust (Puccinia sorghi), head smut (Sporisorium reilianum), and ear rot (Fusarium spp.). The yield varies from 5.7 to 11.5 t ha-1, under a density of 65 000 plants ha-1. The type of ear is conical, with a length of 10 to 15 cm and 12 to 16 rows. The grain is creamy white in color and has a semicrystalline texture.

Keywords : Zea mays L.; corn parent lines; grain quality; yield..

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