DOI: 10.3724/SP.J.1006.2010.01820

Acta Agronomica Sinica (作物学报) 2010/36:11 PP.1820-1831

Analysis of Genetic Structure and Genetic Relationships of Partial Maize In-bred Lines in China

Knowledge about the population structure and relationships within and among maize inbred lines was important to improvement and utilization of maize inbred line. Distance-based cluster and model-based cluster methods were used to analyze the genetic structure and relationship of 97 maize inbred lines used in China with 112 microsatellite (simple sequence repeat, SSR) markers, evenly distributed over 10 chromosomes. Results showed that model-based cluster method was more suitable for maize inbred line clustering than distance-based cluster method, because the former could define the group of inbred lines more effectively than the latter. All inbred lines were grouped into four groups by model-based cluster method: Reid, Lüda red cob (LRC), PB and Tangsipingtou (SPT). According to the result of genetic structure component (Q-value), numerous inbred lines in each group were overlapped in genetic component with the other groups. Reid group kept minimum Nei’s genetic distance with LRC group, had most distant genetic relationship with SPT group. The results of genetic relationships among groups indicated that the four groups could be simplified into three (A: Reid, LRC; B: PB; C: SPT) or two (A: Reid, LRC, PB; B: SPT) potential heterotic groups. The defined population and the genetic component analysis of inbred lines provided the basis for improving the efficiency of hybrid breeding.

Key words:Maize,Inbred line,SSR,Genetic relationship,Genetic structure

ReleaseDate:2014-07-21 15:29:10

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