Classifying white inbred lines into heterotic groups using yield combining ability effects

Riboniesa P. Librando, Efren E. Magulama

Abstract


The classification of maize inbred lines into heterotic groups is an important undertaking in hybrid breeding. This study aimed to evaluate the field performance of 42 white maize test crosses and classify the 21 inbred lines into two heterotic groups. Twenty-one white inbred lines were crossed to two line testers representing the dent and flint heterotic pattern. The resulting test crosses were evaluated for their yield and other agronomic traits. The entries were arranged in alpha lattice design with three replications. Highly significant differences were noted in grain yield and plant height among the test crosses. Three test crosses were identified as promising single cross hybrids with yield potential greater than 6 t/ha having yield advantage of 60% over the hybrid check. Highly significant GCA and SCA effects for grain yield were detected among the inbred lines. Three inbred lines were identified as good general combiners. Three test crosses were noted as good specific combiners. The tester inbred lines classified 11 of the 21 tested lines into heterotic groups based on SCA effects and test crosses mean grain yield. This study demonstrates the usefulness of combining ability effects in classifying inbred lines.

Keywords


corn breeding, general combining ability (GCA), heterosis, specific combining ability (SCA)

References


CIMMYT Maize Program. 1999. A User’s Manual for Fieldbook 5.1/7.1 and Alpha. Mexico, D.F.: CIMMYT

Jaspe GB and Magulama EE. 2007. Identification of maize germplasm with tolerance to low nitrogen fertilization. USM CA Res J 18:109-222

Kempthorne O. 1957. An introduction to genetic statistics. John Wiley and Sons, New York.

Magulama E E, Sales EK, Butardo NG, & Cadungog RC. 2007a. Genetic diversity as revealed by SSR markers and combining ability among yellow maize inbred lines, pp 78-82, In Pixley, K. and S. H. Zhang.(eds). 2007. Proceedings of the ninth Asian Regional maize Workshop. September 5-9, 2005

Magulama EE, Sillote CC, & Madriaga WQ. 2007b. Morphology-based grouping and heterotic patterns in white maize varieties. USM RD Journal 15: 51-60

Melchinger AE. 1999. Genetic diversity and heterosis. In Coors, J, G., Pandel, S. (eds). The genetics and exploitation of heterosis in crops. CSSA-SP. Madison. Wis. 99-118

Menkir AA, Malake-Berhan C, Ingelbrech TheI., & Adepoju A. 2004. Grouping of tropical mid-altitude maize inbred lines o the basis of yield data and molecular makers. Theor Appl. Genet. 108: 1582-1590

Messmer MM, Melchinger AE, Boppenmaier J, Brunklanus-Jung E, & Herman RG. 1992. Relationships among early European maize (Zea mays L.) inbreds. I. Genetic diversity among flint and dent lines revealed by RFLPs. Crop Sci 32:1301–1309

Reif JC, Melchinger AE, Xia XC, Warburton ML, Hoisington DA,

Vasal SK, Beck D, Bohn M, & Frisch M. 2003. Use of SSRs for establishing heterotic groups in subtropical maize. Theor Appl. Genet. 107: 947-957

Vasal SK, Srinivasan G, Hanm GC, & Gonzales F. 1992a. Heterotic patterns of eighty-eight white subtropical CIMMYT maize lines. Maydica 37:319-327

Vasal SK, Srinivasa G, Pandey S, Cordova H. S, Hanm GC, & Gonzales F. 1992b. Heterotic patterns of ninety-two white tropical CIMMYT maize lines. Maydica 37:259-270


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