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Evaluation of Zapalote Chico accessions for conservation and enhancement

Author: Taba, S.
Author: Diaz, J.
Author: Aragon Cuevas, F.
Author: Rincón-Sánchez, Froylan
Author: Hernandez, J.M.
Author: Krakowsky, M.
Year: 2006
Abstract: Conserving traditional maize (Zea mays L.) landraces grown by farmers in Latin America can con- tribute to food security. Core subsets of such landraces that represents that diversity can be used for their en- hancement. One such enhancement effort was conducted on a total of 81 accessions drawn from the CIMMYT maize collection of the race Zapalote Chico and newer accessions collected in 1999 from Istmo de Tehuantepec, Oaxaca, Mexico, where the race Zapalote Chico is pre- dominantly grown. These accessions were evaluated at four locations in the Mexican states of Morelos, Guerrero, and Oaxaca for agronomic and morphological traits to as- sess the intraracial diversity for conservation and en- hancement. Eleven agronomic and morphological traits were measured and used for a multivariate cluster analy- sis. The cluster analysis produced four non-overlapping clusters with 63 accessions, indicating the intraracial di- versity of the Zapalote Chico. The analysis also formed two other clusters with four races, including Tepecintle and Olotillo, which have been introduced to the region of Istmo de Tehuantepec. Using a selection index that ac- counts for grain yield, grain quality, and standability, and an agronomic performance rating, a breeder core subset (the best 20%) was chosen to represent phenotypic diver- sity among the clusters. In the core subset, fifteen acces- sions comprise the core subset of the race Zapalote Chico and three accessions comprise the core subset for the other races. These core subset accessions, which repre- sent the diversity of the regional landraces of maize, can be enhanced through introgression of improved lines or populations for yield potential, drought resistance, and ear rot resistance, while maintaining the desirable grain quality traits of the original races.
Format: PDF
Language: English
Publisher: Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Maiscoltura
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Region: Global
Pages: 209-218
Issue: 2
Volume: 51
Keywords: Zapalote Chico
Keywords: Core Subset
Country of Focus: TEHUANTEPEC
Country of Focus: OAXACA
Country of Focus: MEXICO
Country of Focus: MORELOS
Country of Focus: GUERRERO
Agrovoc: MAIZE
Journal: Maydica

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This item appears in the following Collection(s)

  • Genetic Resources
    Genetic Resources including germplasm collections, wild relatives, genotyping, genomics, and IP
  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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