Abstract
Brachiaria brizantha (Hochst. ex A. Rich.) Stapf. (syn. Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster) is a species used primarily as forage in tropical America and Southeast Asia. B. brizantha has been extensively researched since the 1980s with the initiation of the Tropical Forages Breeding Program conducted by the Brazilian Agricultural Research Corporation (Empresa Brasileira de Pesquisa Agropecuária; EMBRAPA), holding one of the largest germplasm collections in the world. This work has identified 15 new microsatellite markers for this species, which have been used in addition to five previously reported markers, to estimate the genetic similarities among 172 accessions and six cultivars of this species. Similarity index values ranged from 0.40 to 1.00. Two duplications were found in the germplasm. A Bayesian analysis performed using the STRUCTURE 2.3.3 program revealed the presence of three clusters with different allelic pools. This analysis is valuable for the performance of crosses to explore heterosis; however, the mode of reproduction of the accessions and ploidy barriers must be observed for effective exploration. A grouping analysis using the neighbor-joining method was consistent with the STRUCTURE analysis, and a combination approach suggested that this germplasm collection does not exhibit considerable genetic variability despite the presence of three distinct allelic pools. The lack of correlation between the genetic and geographic distances is also discussed.
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Abbreviations
- AMOVA:
-
analysis of molecular variance
- CIAT:
-
Center for Tropical Agriculture
- CTAB:
-
cetyl trimethyl ammonium bromide
- cv.:
-
cultivar
- DNA:
-
deoxyribonucleic acid
- EBC:
-
EMBRAPA Beef Cattle
- EMBRAPA:
-
Brazilian Agricultural Research Corporation
- MCMC:
-
Markov-Chain Monte Carlo
- NJ:
-
neighbor joining
- PCR:
-
polymerase chain reaction
- PIC:
-
polymorphism information content
- RAPD:
-
random amplification of polymorphic DNA
- SDS-PAGE:
-
sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- SSR:
-
simple sequence repeats
- UPGMA:
-
unweighted pair-group method with arithmetic mean
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Acknowledgements
This work was a cooperative effort between EMBRAPA Beef Cattle and the University of Campinas. The authors would like to thank all the personnel from both institutions who made this cooperation possible. We would also like to thank Dr. Lucimara Chiari and BSc. Gisele Leguizamón for helping with plant collection and DNA extraction, Dr. Fernanda Witt Cidade for helping with analyses and BSc. Giovana Maranhão Bettiol Coaracy for helping with ArcGIS version 9.0. The authors were funded by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Project 05/51010-0), by undergraduate fellowships (Vigna, B.B.Z. and Francisco, P.M.) and by a research fellowship awarded to Souza, A. P. from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).
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Communicated by Desiree M. Hautea
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Supplementary Figure 1
A grouping pattern revealed by the unrooted neighbor-joining method, based on Jaccard's similarity, for 172 accessions and six cultivars of Brachiaria brizantha preserved at the EMBRAPA Beef Cattle germplasm collection. The genotypes are named according to annotated numbers listed in Table 1 and colored according to ploidy data from Supplementary Table 3. Diploid genotypes are red colored, tetraploid genotypes are green colored, pentaploid genotypes are blue colored and hexaploids are yellow colored. Black colored genotypes are the one that do not have ploidy data available. (DOC 32 kb)
Supplementary Table 1
Jaccard´s similarity coefficients among 178 genotypes of Brachiaria brizantha evaluated through microsatellite markers. Individuals are identified according to their annotated number (Table 1) (XLS 303 kb)
Supplementary Table 2
The membership coefficient (Q) from STRUCTURE analysis based on microsatellite markers. (XLS 47 kb)
Supplementary Table 3
Ploidy of the Brachiaria brizantha accessions evaluated in this study (XLS 36 kb)
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Vigna, B.B.Z., Jungmann, L., Francisco, P.M. et al. Genetic Diversity and Population Structure of the Brachiaria brizantha Germplasm. Tropical Plant Biol. 4, 157–169 (2011). https://doi.org/10.1007/s12042-011-9078-1
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DOI: https://doi.org/10.1007/s12042-011-9078-1