Resumen

GOMEZ-MONTIEL, Noel Orlando et al. Hybrid corn H-565, a new version of H-507 for the tropical lowlands of Mexico. Rev. Mex. Cienc. Agríc [online]. 2013, vol.4, n.5, pp.819-824. ISSN 2007-0934.

A major accomplishment for increasing corn production in the tropical lowlands of Mexico and other similar warm-climate regions is the generation of new hybrids. One the materials generated for this region by INIFAP which has shown a successful adaptation to the Tropics of Mexico and Central America, with excellent grain yields and which is currently being used for commercial plantings is the corn hybrid H-507; however, it has some characteristics that do not favor the expression of its maximum potential yield. After ten years of convergent improvement, multiple versions of the T₁₂ line were obtained in 2005; they were recombined to form a population from which new lines were derived, including the T₁₂ RC₉₃ line, which was registered as T₄₈. Moreover, the T₁₁ line was selectedper se towards lower plants and cobs, and after the improvement process the improved T11 line was obtained, registered as I47. The single cross ofthese two lines (T₄₈x T₄₇) generated a hybrid of intermediate size which was crossed with several elite lines, the best cross being a trilinear one (T₄₈ x T₄₇) x LT₁₅₄. This produced the hybrid H-565, formed with the improved T₁₁ and T₁₂ lines, so that 50% of its germplasm is from the H-507. Thus, corn producers in the tropical lowlands of Mexico are now offered the improved hybrid H-507 (H-565) with better agronomic characteristics and with the same adaptive capability to the tropics.

Palabras llave : Zea mays L.; Mexican corn hybrid; trilinear hybrid.

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