Relationship of intra- and interpopulation tropical maize single cross hybrid performance and genetic distances computed from AFLP and SSR markers |
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Authors: | A M M Barbosa I O Geraldi L L Benchimol A A F Garcia C L Souza Jr A P Souza |
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Institution: | (1) Departamento de Genética, Escola Superior de Agricultura `Luiz de Queiroz' (ESALQ), Universidade de São Paulo (USP), C.P. 83, 13.400-970, Piracicaba, SP, Brasil;(2) Centro de Biologia Molecular e Engenharia Genética, Universidade Estadual de Campinas (UNICAMP), C.P. 6010, CEP 13.083-970 Campinas, SP, Brasil;(3) Departamento de Genética e Evolução, Instituto de Biologia (IB), UNICAMP, C.P. 6109, CEP 13.083-970 Campinas, SP, Brasil |
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Abstract: | Two sets of tropical maize inbred lines, one derived from the BR-105 population and another derived from the BR-106 population,
were assayed for Amplified Fragment Length Polymorphism's (AFLP) and for Simple Sequence Repeat (SSR), in order to investigate
genetic distances among lines and their relationship to heterotic group assignment and single cross yield performance. Genetic
distances were on average greater for interpopulation than intrapopulation crosses for both AFLP and SSR. Cluster analysis
was in agreement with the original assignment for heterotic groups. Inbred line 16, derived from BR-106, was assigned to the
BR-105 set, in agreement with single cross yield performance from intra- and interpopulation crosses. However, the same pattern
was not observed for SSR where another two lines from BR-106 were also assigned to the BR-105 set. Correlation coefficients
of genetic distances (GD) with F1 grain yield and heterosis were high for BR-106 ×BR-106 crosses
(0.91** and 0.82** for AFLP and SSR, respectively), moderate for BR-105 × BR-105 crosses (0.52* for AFLP and SSR) and low for BR-105 × BR-106 crosses (0.29 and 0.16 for AFLP and SSR, respectively). The lower correlation
at interpopulation level was due to the smaller range of GD caused probably by a previous selection for combining ability.
General results showed that the AFLP molecular marker is efficient in assigning maize lines to heterotic groups and that AFLP-based
GD is suitable for predicting the maize single cross performance for intrapopulation crosses of broad-based populations. The
efficiency of SSR in assigning lines to heterotic groups and for predicting single cross performance was smaller than AFLP.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | AFLP genetic diversity heterosis hybrid performance molecularmarkers SSR Zea mays L |
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