Genetic Diversity in CIMMYT Nontemperate Maize Germplasm: Landraces, Open Pollinated Varieties, and Inbred Lines

Warburton, M L and Reif, J C and Frisch, M and Bohn, M and Bedoya, C and Xia, X C and Crossa, J and Franco, J and Hoisington, D A and Pixley, K and Taba, S and Melchinger, A E (2007) Genetic Diversity in CIMMYT Nontemperate Maize Germplasm: Landraces, Open Pollinated Varieties, and Inbred Lines. Crop Science, 48 (2). pp. 617-624. ISSN 0011-183X

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CIMMYT is the source of improved maize (Zea mays L.) breeding material for a significant portion of the nontemperate maize growing world. Landraces which did not serve as sources for improved maize germplasm may contain untapped allelic variation useful for future breeding progress. Information regarding levels of diversity in different germplasm would help to identify sources for broadening improved breeding pools and in seeking genes and alleles that have not been tapped in modern maize breeding. The objectives of this study were to examine the diversity in maize landraces, modern open pollinated varieties (OPVs), and inbred lines adapted to nontemperate growing areas to find unique sources of allelic diversity that may be used in maize improvement. Twenty-five simple sequence repeat markers were used to characterize 497 individuals from 24 landraces of maize from Mexico, 672 individuals from 23 CIMMYT improved breeding populations, and 261 CIMMYT inbred lines. Number of alleles, gene diversity per locus, unique alleles per locus, and population structure all differ between germplasm groups. The unique alleles found in each germplasm group represent a great reservoir of untapped genetic resources for maize improvement, and implications for hybrid breeding are discussed.

Item Type: Article
Subjects: Others > Maize
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 14 Oct 2011 09:15
Last Modified: 15 Mar 2012 06:33
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Acknowledgement: This research was supported by funds from the German “Bundesministerium für wirtschaftliche Zusammenarbeit und Entwicklung” Projekt No. 98.7860.4-001-01. The authors wish to thank Salvador Ambriz, Emilio Villordo, Leticia Diaz, and Ana Gomez, for their excellent technical assistance, and all CIMMYT maize breeders without whose technical and intellectual input this paper would never have been written.
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