Growth responses of Stylosanthes humilis (Fabaceae) populations to saline stress |
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| Institution: | 1. Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Caixa Postal 486, 31270-901, Belo Horizonte, Minas Gerais, Brazil;2. Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil;3. Departamento de Genética, Escola Superior de Agricultura ‘Luiz de Queiróz’, Universidade de São Paulo, Caixa Postal 83, 13418-900, Piracicaba, São Paulo, Brazil;1. CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos) (CCT La Plata CONICET-UNLP), 47 esq. 116, CP 1900 La Plata, Argentina;2. Comisión de Investigaciones Científicas Pcia, de Buenos Aires (CIC-PBA), Argentina;3. LIPA (Laboratorio de Investigación en Productos Agroindustriales), Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, Calle 60 y 119, CP 1900 La Plata, Argentina;1. School of Plant Biology, UWA, 35 Stirling Hwy, Crawley, WA 6009, Australia;2. The UWA Institute of Agriculture, UWA, 35 Stirling Hwy, Crawley WA 6009, Australia;3. CSIRO Plant Industry, Waite Campus, Urrbrae SA 5064, Australia;4. CSIRO Plant Industry, Private Bag No. 5, Wembley WA 6913, Australia;5. Plant Breeding Institute, Faculty of Agriculture and Environment, The University of Sydney, 12656 Newell Highway, Narrabri NSW 2390, Australia;1. College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, PR China;2. Institute of Horticulture Crops, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, PR China;3. Xuhuai Region Huaiyin Institute of Agricultural Sciences, Huaian, Jiangsu 223001, PR China;1. Biophysical Chemistry & Structural Biology Laboratory, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidyanagari Campus, Mumbai 400098, India;2. Molecular Simulations Group, Department of Pharmaceutical Chemistry, Goa College of Pharmacy, Panaji, Goa 403001 India;1. Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil;2. Division of Endodontics, University of Manitoba, Winnipeg, Manitoba, Canada;1. Ocean Technology and Engineering, National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom;2. Ocean Biogeochemistry and Ecosystems, National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom;3. Sorbonne Universités, UPMC Univ Paris 06, CNRS, Fédération de Recherche (FR2424), Station Biologique de Roscoff, 29680 Roscoff, France;4. School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom;5. GEOMAR Helmholtz Centre for Ocean Research, 24148 Kiel, Germany |
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| Abstract: | The growth responses to salinity of seedlings of six populations of Stylosanthes humilis from three ecogeographic regions of Northeast Brazil, characterized by wet or semi-arid climate, were analyzed following 28 days in solution cultures at concentrations of 0, 40, 80 and 120 mM NaCl. Root and shoot mass, shoot length and characters of foliar damage (number of leaves with chlorosis and necrosis) of the populations were more affected by increasing NaCl than numbers of leaves and branches and root length. Although S. humilis has been considered a salt sensitive legume, significant differences in salt tolerance between populations were found. The estimated concentrations which reduced shoot dry mass by 50 and 25% varied between populations from 84 to 108 and from 49 to 83 mM NaCl, respectively. Salt tolerance in S. humilis during the initial growth stage was lower than the reported one for germination. With one exception, populations from semi-arid climate with saline soils showed higher salt tolerance than those from non saline soils. The results suggest that salt tolerance in these populations is mainly associated with the occurrence of salinity in the soil of their provenance. |
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