Lunatus Network

Who are we?

The International Lima Bean Network (also known as the Lunatus Network) is a group of academics interested in the study of Lima beans (Phaseolus lunatus L.). It began in 2014 as a collaboration between Mexican and Brazilian researchers studying Lima bean genotypes from Brazil and Mexico. This collaborative study examined several of Lima bean including the genetic resources of the species, its domestication, and nitrogen fixation in the roots. One of the main outcomes of this collaboration was the celebration of the "International Lima Bean Symposium I", held in October 2016 in Teresina, Brazil. This symposium lasted two days and had two objectives: to increase research efforts to improve knowledge of this species and to bring together researchers from cutting-edge institutions working with Lima beans in Brazil, Mexico, and Colombia. In the following years, funding was sought to hold a second international meeting, but it was not obtained. It was not until 2022 that, with the support of the Central University of Ecuador, the Ecuadorian Corporation for the Development of Research and the Academy (CEDIA) and the Scientific Research Center of Yucatan, A.C., the “International Lima Bean Symposium II: Challenges and Perspectives in Climate Change Scenarios” was held in Quito, Ecuador. This event was attended by researchers from a range of institutions in Ecuador, Brazil, Mexico, Colombia, Peru, the United States, and Italy. It lasted two days and focused on four topics: conservation, improvement, origin and evolution, and plant-microorganism relationship of the rhizosphere. It was during this symposium that the decision was made to create the International Lima Bean Network and, after several work meetings, the Lunatus Network was officially established on August 24, 2022.

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Agrobiodiversity and Climate Change

Climate change and human activities are contributing to environmental deterioration and the loss of biodiversity globally. To avoid extinction, populations of different species will need to adapt to new local conditions or migrate to new suitable habitats. Among the organisms that will be most sensitive to climate change are domesticated species. This sensitivity is due to at least three factors: 1) the intensity of artificial selection during domestication tends to greatly reduce genetic diversity and as a result, most domesticated species have low genetic diversity, small population sizes, and a high accumulation of genomic load; 2) during domestication, traits of human interest are often selected for, while physiological traits are often controlled by the breeder; 3) the cultivated species are geographically limited and their potential migration to suitable sites depends on human management, including the deforestation of natural vegetation and the resulting intensification of global warming. In combination, these three factors limit the capacity of domesticated species to adapt to new climatic conditions. Given that our future food supply will depend heavily on domesticated species, it is imperative that we design alternative strategies for their management and conservation.

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To mitigate the impact of climate change on domesticated species, it has been proposed that wild relatives or landraces – local varieties adapted to the environment – could be used to introduce useful genetic diversity into vulnerable populations. In theory, characteristics of interest can be introduced through adaptive introgression, a mechanism by which a fragment of DNA that confers a beneficial adaptation is introduced into the genome of another species through crosses and backcrosses. The development of genomic sequencing and complex statistical programs have made it possible to identify the genetic bases of beneficial adaptations and to identify the genetic variants that confer local adaptation to conditions found in climate change. Recently, machine learning algorithms have been developed which allow the construction of models that describe the change in the frequencies of adaptive alleles in regional populations. By projecting these models into the future, and comparing them with current models, it is possible to identify geographic regions where populations will need to respond to selection and have a resulting change in allele frequency to adapt to new climatic conditions. In theory, those populations that must respond to selection pressures will be more vulnerable to climate change than populations that will remain stable over time. This valuable information can be used to prioritize populations for conservation, identify populations that could contribute useful genetic diversity to vulnerable populations, and design the mechanisms of adaptive gene flow between vulnerable and resilient populations.

The species of interest for our Network, the Lima bean, has increased in global relevance in the last decade. This is partially the result of a growing concern for food security as climate change has begun to pose challenges for grain legume production. It is also because Lima beans have a greater range of ecological adaptations than that observed in the common bean (P. vulgaris). This suggests the existence of a broader genetic base to use in Lima bean breeding programs. Studying the effects of climate change on Lima bean is relevant to all three of the working groups within the Lunatus Network: origin and evolution, conservation, and improvement. First, studies of population genomics and local adaptation to climate change are contributing to understanding the origin and evolution of the species. Second, the information on local adaptation and climate change makes it possible to identify which populations will be vulnerable to climate change, and thus coordinate their conservation. Third, the identification of populations resistant to climate change will allow for improvement projects of populations susceptible to climate change. The final goal of the study of the effects of climate change on Lima beans is to carry out frontier research that allows supporting the conservation and permanence of traditional agricultural systems of Lima beans, and thus contribute to human food security in the near future.

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Lima bean (Phaseolus lunatus L.)

The genus Phaseolus comprises about 80 wild species of legumes, all of American origin (Debouck, 2021). Of all these species, only five were domesticated, including the Lima bean. In its wild state, the Lima bean has a wide distribution ranging from northern Mexico to northern Argentina, at elevations from sea level to greater than 2000 m in the Andes of South America. Throughout its range, the wild Lima bean inhabits diverse ecological conditions, making it a species of special scientific interest.

Lima bean was domesticated twice. Genetic evidence shows that one domestication occurred in Mesoamerica and another in South America. Domestication in Mesoamerica may have occurred in central-western Mexico. This domestication event gave rise to landraces with small seeds known as the “Sieva” and “Potato” types. In South America domestication likely occurred in the Andes region of northern Ecuador or Peru. This domestication event gave rise to large-seeded landraces known as the “Large Lima” type. In both cases, domestication caused changes in domesticated populations as compared to their wild relative, including but not limited to increased seed and pod size, loss or decrease in pod dehiscence, decrease in anti-nutritional compounds in the seed, and earlier flowering. After its domestication, the Lima bean was introduced to new regions of the American continent where different human groups gave it unique names including “ib” in the Maya language of the Yucatan Peninsula, “cacha” in the Paez language of Colombia, and “pallar” in the Quechua language of Peru.

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Lima beans are rich in protein, dietary fiber, vitamins, and minerals. They have been an important part of the diet of various indigenous communities in the Americas since pre-Hispanic times. The archaeological record indicates that the cultivation of Lima bean is ancient among pre-Columbian cultures. In the Andes, the oldest archaeological records of domesticated Lima beans are found in Peru, in Cueva Guitarrero and Chilca, with an age of 3,500 and 5,600 years respectively. In Mesoamerica, the oldest remains date back about 1,300 years and come from Dzibilchaltún in Yucatán, Mexico. In post-Columbian times, the Lima bean was brought to Africa, Asia and Europe, and today it is the second most important cultivated species of the genus Phaseolus.

Objectives, Mission, Vision

Objetivos

General

Promote the conservation, study, and use of Lima beans as a possible partial solution to the challenge of global food insecurity.

Specifics

  • Generate a digital repository of the existing information on Lima bean in the topics of: origin and evolution, conservation, improvement and plant-microorganism interactions in the rhizosphere.
  • Generate, support, and coordinate research initiatives on Lima beans.
  • Support the formation and/or training of high-level human resources.
  • Promote the production, consumption, and use of Lima beans.
  • Promote alternative uses of Lima beans and those associated with their plant-microorganism relationship in the rhizosphere.

Network Mission

We generate collaborations to compile, share, and disseminate information about Lima beans. We promote work and research synergies, and we train high-level human resources, all in order to promote the cultivation of Lima beans to address global food security problems.

Network Vision

To be recognized as a collaborative network of actors belonging to different sectors of society (academic, scientific, industrial, governmental, and NGOs, among others) that supports and promotes the study, conservation, and use of Lima beans.

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Organizational Structure

Organigrama

During the period from January 2023 to January 2025, the coordinators are:

  • General Coordinator: Dr. Jaime Martínez Castillo
  • Coordinator of Origin and Evolution: Dr. María Isabel Chacón Sánchez
  • Coordinator of Conservation: M. en C. Luis Guillermo Santos
  • Coordinator of Improvement: Dr. Luz M. Espinoza de Arenas
  • Coordinator of Plant-Rhizosphere Relationship: Dr. Ademir S. Ferreira Araujo

Members

Founding Members of the International Lima Bean Network

Name Area of Interest Country of Residence Institution
María I. Chacón Sánchez Origin and Evolution Colombia Universidad Nacional de Colombia
Elena Bitocchi Origin and Evolution Italia Università Politecnica delle Marche
Daniel G. Debouck Origin and Evolution Colombia The Alliance Bioversity International/
Centro Internacional de Agricultura Tropical
Rubén H. Andueza Noh Origin and Evolution México Instituto Tecnológico de México
Jaime Martínez Castillo Origin and Evolution México Centro de Investigación Científica de Yucatán, A. C.
Jonás A. Aguirre Liguori Origin and Evolution México Universidad Autónoma de Yucatán
Leidy T. García Navarrete Origin and Evolution Colombia Universidade Nacional de Colombia
Eduardo Peralta Idrovo Origin and Evolution Ecuador Investigador independiente
Angela C. de Almeida Lopes Origin and Evolution Brazil Universidad Federal do Piauí
Nora Castañeda Alvarez Conservation Germany Crop Trust
Luis G. Santos Meléndez Conservation Colombia The Alliance Bioversity International/
Centro Internacional de Agricultura Tropical
Angel R. Murillo Ilbay Conservation Ecuador Instituto Nacional de Investigaciones Agropecuarias
Carlos M. Nieto Cabrera Conservation Ecuador Universidad Central del Ecuador
Jorge A. Duitama Castellanos Improvement Colombia Universidad de los Andes
Luz M. Espinoza de Arenas Improvement Perú Universidad Nacional San Luis Gonzaga
Regina L. Ferreira Gomes Improvement Brasil Universidade Federal do Piauí
Kimberly Gibson Improvement USA University of California, Davis
Horacio S. Ballina Gómez Improvement México Instituto Tecnológico de México
Eudaldo Jadán Veriñaz Improvement Ecuador Universidad Técnica de Machala
Ademir S. Ferreira Araujo Plant-Rhizosphere Brazil Universidade Federal do Piauí
Andrea León Cadena Plant-Rhizosphere Ecuador Universidad Central del Ecuador
Ernesto A. Ormeño Orrillo Plant-Rhizosphere Perú Universidad Nacional Agraria La Molina

New Members

Name Area of Interest Country of Residence Institution
Sandra V. Garcés Carrera Mejoramiento Ecuador Instituto Nacional de Investigaciones Agropecuarias
Salvador Soler Mejoramiento España Universitat Politècnica de València
María Rosario Figàs Mejoramiento España Universitat Politècnica de València
Jaime Prohens Mejoramiento España Universitat Politècnica de València
Natalia de Almeida Conservación Uruguay Universidad Tecnológica
Rafael Vidal Conservación Uruguay Universidad de la República
Amsalu Nebiyu Woldekirstos Mejoramiento Etiopía Jimma University
Alvaro R. Monteros Altamirano Conservación Ecuador Instituto Nacional de Investigaciones Agropecuarias
Eddie E. Zambrano Zambrano Conservación Ecuador Instituto Nacional de Investigaciones Agropecuarias
Juan Carlos Suárez Salazar Mejoramiento Colombia Universidad de la Amazonia

Repository

Contacts

  • General Coordinator Dr. Jaime Martínez Castillo. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Coordinator of Origin and Evolution Dr. María I. Chacón Sánchez. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Coordinator of Conservation Luis Guillermo Santos. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Red Lunatus

  • Coordinator of Imprvoement Dra. Luz M. Espinoza Arenas. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Coordinator of Plant-Rhizophere Interactions Dr. Ademir S. Ferreira Araujo. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Official Email of the Network: This email address is being protected from spambots. You need JavaScript enabled to view it.

News

  • If you are interested in joining the Lunatus Network, you can contact the General Coordinator or email This email address is being protected from spambots. You need JavaScript enabled to view it.

GALERIA

Repositorio