Arango, Jacobo

Cardoso, Juan Andres

Villegas, Daniel

English

Cardoso, Juan Andrés

Villegas, Daniel Mauricio

CGSpace (CGIAR)

IntroductionObjective MethodologyResultsConclusionsAcknowledgments: The authors would like to acknowledge support from the UK Research and Innovation (UKRI) Global Challenges Research Fund (GCRF) GROW Colombia grant via the UK’s Biotechnology and Biological Sciences Research Council (BB/P028098/1).www.growcolombia.orgReferencesMULTIPURPOSE ROLES OF TROPICAL FORAGES: ADVANCES ON UNDERSTANDING CADMIUM EXTRACTION POTENTIAL AND TRADE-OFFS AND SYNERGIES OF MULTISPECIES PASTURESAuthors: Juan Andrés Cardoso1, Daniel Villegas1, Jose de Vega2 and Jacobo Arango1Institutions: 1 The Alliance of Bioversity International and the International Center for Tropical Agriculture (CIAT)2 Earlham Institute, Norwich, United KingdomTropical forages (i.e., plants used to feed animals, mostly cattle) can lead to a more sustainable land management. Currently, the Alliance of Bioversity-Center for Tropical Agriculture, as part of the GROW Colombia project, is researching two aspects that have been somehow neglected in Colombia:1) the  ability to reclaim cadmium polluted land by the use of tropical grasses and;2) the inclusion of multispecies pastures as a way to increase their resiliency under uncertainties such as the ones originated by the current climatic emergency.This work is mostly performed from an eco-physiological point of view and aims to gather data from experiments under semi-controlled (greenhouse) and field conditions.Cadmium phytoextraction potential • To identify tropical grasses able to tolerate and uptake Cadmium. • Test methods to extract cadmium from plant tissue that might allow the use of such tissue for another purposes (e.g., feed for animals, biofuel).Multispecies pastures• Testing whether there are synergies of trade-offs (e.g., productivity and tolerance to abiotic stress) in mixing different grasses and legumes.• Test the effect of multispecies pastures on soil health (e.g., soil organic matter, soil aggregates, soil friability).Cadmium phytoextraction potential• Two plants with contrasting type of growth were tested (B. humidicola, creeping plant; Napier grass, erect one)Our preliminaries results show that:• Among a number of grasses tested (Brachiaria spp., Megathyrsus maximus, Napier grass), the latter one can extract significant amounts of Cadmium, to the level of a hyper-accumulator plant.• Greenhouse studies have shown that mixing species have great potential to increase tolerance to abiotic stresses (e.g., waterlogging).• Research is underway to test responses of a number of grasses for Cadmium phytoextraction and mixtures of species under soil and field conditions respectively.• We expect that information originated from this project will increase awareness of the roles and utilities of tropical forages can brought up at farm, catchment and landscape levels, and also can further enrich their multifunctional use in Colombia and elsewhere. • Cardoso JA, Rao IM. 2019. Drought resistance in tropical forage grasses: Opening a fertile ground for innovative research. In: M. Pessarakli (ed).  Handbook of Plant and Crop Stress, 4rd Edition. CRC Press, Taylor and Francis Group, USA • Horrocks CA, Arango J, Arevalo A, Nuñez J, Cardoso JA, Dungait JAJ. 2019. Smart forage selection could significantly improve soil health in the tropics. Science of the Total Environment 688: 609-621.• Jiménez JC, Cardoso JA, Leiva L, Gil J, Forero MG, Worthington ML, Miles JW, Rao IM. 2017. Non-destructive phenotyping to identify Brachiaria hybrids tolerant to waterlogging stress under field conditions. Frontiers in Plant Science 8:167. • Cardoso JA, Jimenez JC, Rao IM. 2014. Waterlogging-induced changes in root architecture of germplasm accessions of the tropical forage grass, Brachiaria humidicola. AoB Plants 6: 1-13 • Cardoso JA, Rincón J, Jiménez JdlC, Noguera D, Rao IM. 2013. Morpho-anatomical responses to waterlogging by germplasm accessions in a tropical forage grass. AoB Plants doi: 10.1093/aobpla/plt047.Cadmium phytoextraction potential 1. Hydroponic solution culture experiments with 100 ppm Cadmium added (to mimic Cadmium polluted soils).2. Harvesting of plants (fractioning of leaves, stems and roots) after 20 days of growth under solutions with or without added Cadmium.3. Analyses of biomass accumulation under different treatmets, Cadmium content in tissues and other relevant physiological responses (e.g., chlorophyll content, stomatal conductance, root elongation rates).Multispecies pastures1. Greenhouse experiments: Short term experiments (~3 weeks). Different species are mixed to test if their reponses under a particular stress are affected (e.g., mixing  Brachiaria humidicola—tolerant to waterlogging— and Brachiaria hybrid Mulato II—sensitive to waterlogging—). 2. Field experiment: Longer term experiment recently established (November, 2019) where productivity and other parameters (e.g., protein content and fibers) will be recorded over time.• Mulato II (sensitive to waterlogging) benefits from growing together to                       B. humidicola (tolerant).Multispecies pasturesGreenhouse experiment Field experiment• Multispecies (grasses + legumes)  trial established where drought and waterlogging stress can be managed 10 m• Images collected with drones are used to record changes over time• Deep learning and object based segmentation are used for analyses Acknowledgments:The authors would like to acknowledge support from the UK Research and In ovation (UKRI) Global Challenges Research Fund (GCRF) GROW Colombia grant via the UK’s Biotechnology and Biological Research Council (BB/P028098/1)www. growcolombia.orgCGIAR Research Program on Livestockhttps://livestock.cgiar.org/

Multipurpose roles of tropical forages: Advances on understanding cadmium extraction potential and trade-offs and synergies of multispecies pastures

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Multipurpose roles of tropical forages: Advances on understanding cadmium extraction potential and trade-offs and synergies of multispecies pastures

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