The role of microorganisms in litter degradation in arid and semi-arid zones, where soil and water salinization is one of the main factors limiting carbon turnover and decay, remains obscure. Heterostachys ritteriana (Amaranthaceae), a halophyte shrub growing in arid environments such as "Salinas Grandes" (Córdoba, Argentina), appears to be the main source of organic matter in the area. Little is known regarding the microorganisms associated with H. ritteriana, although they are a potential source of enzymes such as cellulolytic ones, which might be important in biotechnological fields such as bioethanol production using ionic liquids. In the present study, by studying the microbiota growing on H. ritteriana leaf litter in "Salinas Grandes," we isolated the cellulolytic fungus Fusarium equiseti LPSC 1166, which grew and degraded leaf litter under salt stress. The growth of this fungus was a function of the C substrate and the presence of NaCl. Although in vitro the fungus used both soluble and polymeric compounds from H. ritteriana litter and synthesized extracellular β-1,4 endoglucanases, its activity was reduced by 10% NaCl. Based on these results, F. equiseti LPSC 1166 can be described as a halotolerant cellulolytic fungus most probably playing a key role in the decay of H. ritteriana leaf litter in "Salinas Grandes."

Cátedra de Fitopatología CIDEFI Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata 60 y 119 CC 31 1900 La Plata Argentina

Cátedra de Microbiología Agrícola Facultad de Ciencias Agrarias y Forestales UNLP 60 y 119 1900 La Plata Argentina

Centro de Investigación y Desarrollo en Ciencias Aplicadas Dr Jorge J Ronco CINDECA UNLP Consejo Nacional de Investigaciones Científicas y Técnicas Facultad de Ciencias Exactas 47 257 B1900AJK La Plata Argentina

Facultad de Ciencias Naturales y Museo UNLP Instituto de Botánica Spegazzini 53 477 1900 La Plata Argentina

Fundación Fungi Cosmos Av General Paz 154 4° piso oficina 4 5000 Córdoba Argentina

Laboratorio de Micología IMBIV CONICET Universidad Nacional Córdoba CC 495 5000 Córdoba Argentina

UNLP CCT La Plata CONICET Instituto de Fisiología Vegetal Diag 113 y 61 CC 327 1900 La Plata Argentina

UNLP CONICET Facultad de Ciencias Exactas Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Diag 113 y 64 CC 16 suc 4 1900 La Plata Argentina

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