Evaluating testcross performance and genetic divergence of lines derived from reciprocal tropical maize composites Public Deposited

http://ir.library.oregonstate.edu/concern/articles/6q182q308

This is the publisher’s final pdf. The published article is copyrighted by the author(s). The article is copyrighted by Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria, Forestry Reaserch Centre and published by Consiglio per la Ricerca e la sperimentazione in Agricoltura, Unità di Ricerca per la Valorizzazione qualitativa dei cereali. It can be found at:  http://www.maydica.org/

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  • The development of hybrids with enhanced expression of heterosis depends on the genetic background of the source population and the effectiveness of a breeding scheme used to identify and use divergent inbred lines with good combining ability. The present study was conducted to examine the potential of improved tropical reciprocal composites as sources of inbred lines for developing productive hybrids. Thirty-six S₄ lines derived from the third RRS cycle of each composite were crossed in pairs to form 36 testcrosses, which were evaluated along with commonly grown commercial hybrids in Nigeria across nine test environments. Results showed consistent ranking of testcrosses for grain yield and other traits across the diverse test environments. The best 22 testcrosses produced 21% to 51% more grain yields than the highest yielding commercial hybrid. Several testcrosses combined high grain yields with other desirable agronomic traits. The SSR and SNP markers used in the present study detected a broad range of genetic diversity among the 72 S₄ lines, which was structured along the two composites. The two markers portrayed similar trends in determining genetic distance estimates and detecting composite-specific alleles in the S₄ lines. These results highlight the potential of improved reciprocal composites as sources of new and divergent parents for developing productive hybrids and as sources of novel alleles for broadening and diversifying the genetic base of adapted germplasm to sustain genetic gain in productivity of hybrids in WCA.
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  • Menkir, A., Kling, J. G., Anjorin, B., Ladejobi, F., & Gedil, M. (2015). Evaluating testcross performance and genetic divergence of lines derived from reciprocal tropical maize composites. Maydica, 60(2), M14.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-07-18T14:20:39Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) MenkirEvaluatingTestcrossPerformance.pdf: 175926 bytes, checksum: 5a976e143409cda23b2b6ac04bdd2ab3 (MD5)
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-07-18T14:19:36Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) MenkirEvaluatingTestcrossPerformance.pdf: 175926 bytes, checksum: 5a976e143409cda23b2b6ac04bdd2ab3 (MD5)
  • description.provenance : Made available in DSpace on 2016-07-18T14:20:39Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) MenkirEvaluatingTestcrossPerformance.pdf: 175926 bytes, checksum: 5a976e143409cda23b2b6ac04bdd2ab3 (MD5) Previous issue date: 2015

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