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Boeri, P.; M. Cedrés Gazo; M. Failla; D. Barrio; D. Dalzotto & S. Sharry. 2019. Optimum germinative conditions of a multipurpose shrub from Patagonia: Prosopis alpataco (Fabaceae). Darwiniana, nueva serie 7(2): 199-207. OPTIMUM GERMINATIVE CONDITIONS OF A MULTIPURPOSE SHRUB FROM PATAGONIA: PROSOPIS ALPATACO (FABACEAE) 1 Universidad Nacional de Río Negro, Belgrano 526, (8500) Viedma, Río Negro, Argentina; pboeri@unrn.edu.ar (author for correspondence). 2 Centro de Investigación y Transferencia de Río Negro, CIT-RN-CONICET, Río Negro, Argentina. 3 Unidad Integrada para la Innovación del Sistema Agroalimentario de la Patagonia Norte, UIISA, Río Negro, Argentina. 4 Dirección de Bosques, Ministerio de Agricultura, Ganadería y Pesca de Río Negro, Belgrano 544, (8500) Viedma, Río Negro, Argentina. 5 Proyecto Patagonia Noreste, Gianni 367, Balneario El Cóndor (8501), Viedma, Río Negro, Argentina. 6 Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, Calle 60 s/n, (1900) La Plata, Buenos Aires, Argentina. Patricia Boeri1,2,3, Marianelén Cedrés Gazo4, Mauricio Failla5, Daniel Barrio1,2,3, Daniela Dalzotto1,2,3 & Sandra Sharry1,2,3,6 Several factors limit the native plants production. The aim of this study was to optimize the germination of Prosopis alpataco f. alpataco from northeastern Patagonia, Argentina. This is a key species of the Monte, one of the most threatened South American ecoregions. Seeds were incubated in chamber at 25 45 oC in darkness for 7 days, evaluating eight germinative parameters. Chemical scarification with H2SO4 (2, 5, 10, 20, 30, 40, 50 and 60 min) and mechanical scarification (by partial and total cutting of the seminal cover edge) were tested. The best results (100 % germinative capacity reached in one day) were recorded at 30 oC (optimum germination temperature) in seeds scarified with H2SO4 (during 30 min) and with total cutting of the seminal cover edge. The use of H2SO4 is recommended for mass propagation and the total cutting of the seminal cover edge for small-scale production. It can be concluded that P. alpataco f. alpataco from northeastern Patagonia had a higher germinative response after an exposure to a range of relatively simple chemical or mechanical treatments. The techniques achieved here provide valuable information for conservation and production of plants of this species. This work represents the first optimum germinative conditions of P. alpataco f. alpataco from northeastern Patagonia. Its results open new lines for future research of other austral Prosopis species.