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Genetic studies in Centrosema pubescens benth, a tropical forage legume: the mating system, genetic variability and genetic relationships between Centrosema species

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Abstract

In this study, we used microsatellite loci to estimate the outcrossing rate of Centrosema pubescens in open-pollinated populations of 10 progenies that each contained 20 genotypes. The multilocus outcrossing rate was 27%, which suggested a mixed mating system with a predominance of autogamy. The single locus outcrossing rate was 13%. The difference was 0.040, which indicated that only 4% of outcrossing occurs in related individuals. A paternity correlation of 14% suggests that there is a low probability of finding full sibs in the progeny. Cross-amplification of the 26 microsatellite loci available for C. pubescens was evaluated across 11 different Centrosema species. Nineteen of the 26 tested microsatellites were successfully transferable across the Centrosema species. The polymorphism information content and discriminating power evaluated had averages of 0.64 and 0.77, respectively. A total of three clusters were assembled to demonstrate the genetic relationships between Centrosema species. The transferable microsatellite loci should be useful for exploiting the genetic resources of the Centrosema species and determining the outcrossing rate, which are essential for proposing effective approaches for conservation and for establishing strategies for the selection and improvement of Centrosema spp.

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Acknowledgments

The authors are grateful to the Embrapa Cerrados, Brasília-DF and the Instituto de Zootecnia, Nova Odessa-SP for providing plant material for the study. This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), which provided financial support (Project 05/51010-0) and a graduate fellowship to Sousa, A.C.B. (06/52953-8), and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), which awarded a research fellowship to Souza, A. P.

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Authors and Affiliations

  1. Genetic Engineering and Molecular Biology Center (CBMEG), University of Campinas (UNICAMP), CP 6010, Campinas, SP, CEP 13083-970, Brazil

    A. C. B. Sousa, T. Campos, D. A. Sforça & A. P. Souza

  2. Brazilian Agricultural Research Corporation, EMBRAPA Cerrados, BR 020, Km 18, Planaltina, DF, CEP 73310-970, Brazil

    M. A. Carvalho & A. K. B. Ramos

  3. Agronomic Institute of Campinas, Pólo Apta Centro Sul, Rod. SP 127 Km 30, CP 28, Piracicaba, SP, CEP 13400-970, Brazil

    M. I. Zucchi

  4. Forage Breeding Department, Brazilian Agricultural Research Corporation, EMBRAPA Beef Cattle, CP 154, Campo Grande, MS, CEP 79002-970, Brazil

    L. Jank

  5. Plant Biology Department (DBV), Biology Institute, University of Campinas (UNICAMP), CP 6109, Campinas, SP, CEP 13083-970, Brazil

    A. P. Souza

Authors
  1. A. C. B. Sousa
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  2. M. A. Carvalho
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  3. A. K. B. Ramos
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  4. T. Campos
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  5. D. A. Sforça
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  6. M. I. Zucchi
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  7. L. Jank
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  8. A. P. Souza
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Correspondence to A. P. Souza.

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Sousa, A.C.B., Carvalho, M.A., Ramos, A.K.B. et al. Genetic studies in Centrosema pubescens benth, a tropical forage legume: the mating system, genetic variability and genetic relationships between Centrosema species. Euphytica 181, 223–235 (2011). https://doi.org/10.1007/s10681-011-0415-0

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