Criteria for developing second-cycle hybrids in maize

Ipsilandis, C.G. and Tokatlidis, I.S. and Vafias, B. and Stefanis, D. (2006) Criteria for developing second-cycle hybrids in maize. Asian Journal of Plant Sciences, 5 (4). pp. 680-685.

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Recycling of the F1 maize hybrid Lorena was conducted in Greece, using 2 breeding cycles. The breeding scheme was based on the inbred line method for improving yielding performance of lines per se. The line development was based on a pedigree selection scheme with selfing and evaluation under favourable field conditions. Early evaluation included honeycomb designs and wide spacing. After 2 cycles of recycling, heterosis and heterobeltiosis levels were found very low or negative and inbred line yielding performance per se was high reaching the original hybrid yield. This indicated excessive exploitation of favourable additive gene action, which led to a homozygote advantage. Final crosses were similar or sometimes better than original hybrid. Several criteria were used for the breeding procedure. The choice of starting material was based on inbreeding depression, general combining ability and specific combining ability estimation conducted previously. The breeding procedure was based on additive gene action. The breeding scheme was based on a new approach of the inbred line method on cross-fertilized species and the final target was focused on maximizing yielding performance and not heterosis. Evaluation during early stages was based on favourable experimental conditions, incorporating honeycomb field designs

Item Type: Article
Author Affiliation: Department of Plant Sciences, T.E.I. of Western Macedonia, Branch of Florina, Terma Kontopoulou, 53100 Florina, Greece
Subjects: Plant Production
Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Maize
Depositing User: Mr T L Gautham
Date Deposited: 10 Jan 2011 21:28
Last Modified: 10 Jan 2011 21:29
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