**6. Acknowledgments**

MDP was funded by the South African Protein Research Trust and the National Research Foundation in South Africa and BMG was funded by Subprograma Estancias de movilidad posdoctoral en centros extranjeros (2009), Ministerio de Educación (Spain). BAF was financially supported by CIAT, Colombia. This work was funded by EU FP7 (PIRSES-GA-2008-230830: Legume Improvement).
