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当前位置: 首页 > 文章 > Extracts from Marine Macroalgae and Opuntia ficus-indica Cladodes Enhance Halotolerance and Enzymatic Potential of Diazotrophic Rhizobacteria and Their Impact on Wheat Germination Under Salt Stress 土壤圈(英文版) 2018,28 (2)
Position: Home > Articles > Extracts from Marine Macroalgae and Opuntia ficus-indica Cladodes Enhance Halotolerance and Enzymatic Potential of Diazotrophic Rhizobacteria and Their Impact on Wheat Germination Under Salt Stress Pedosphere 2018,28 (2)

Extracts from Marine Macroalgae and Opuntia ficus-indica Cladodes Enhance Halotolerance and Enzymatic Potential of Diazotrophic Rhizobacteria and Their Impact on Wheat Germination Under Salt Stress

作  者：
Abdelwahab Rai;Ameur Chérif;Cristina Cruz;Elhafid Nabt
单  位：
LR Biotechnology and Bio-Geo Resources Valorization, Higher Institute for Biotechnology, University of Manouba, Sidi Thabet Biotechpole, 2020 Sidi Thabet, Ariana 2080 (Tunisia);Université de Béjaïa, FSNV, Laboratoire de Maitrise des Energies Renouvelables (LMER), Equipe de Biomasse et Environnement, Targa Ouzemmour, Béjaïa 06000 (Algérie;Département de Microbiologie, Faculté des Sciences de la Nature et de la Vie, Université Ferhat Abbas, Sétif-1 19000 (Algérie);cE3c-Centre for Ecology, Evolution and Environmental Changes, Campo Grande Bloco C-2, Piso 5, Sala 03, Lisboa 1749-016 (Portugal); Université de Béjaïa, FSNV, Laboratoire de Maitrise des Energies Renouvelables (LMER), Equipe de Biomasse et Environnement, Targa Ouzemmour, Béjaïa 06000 (Algérie)
关键词：
selected;extracts;mmol;gb;opuntia ficus-indica;marine macroalga
摘  要：
Soil salinity, which affects more than 6% of the earth's land surface and more than 20% of its irrigated areas, is a major threat to agriculture. Diazotrophic bacteria are among the functional groups of soil microbiota that are threatened by this abiotic stress, as their activity is mostly inhibited by salt stress. Seventy bacterial strains with distinct characteristics were isolated from soils by using N-free Jensen's selective medium. Based on their ability to produce metabolites of agricultural interest, four strains were selected and identified as Flavobacterium johnsoniae, Pseudomonas putida, Achromobacter xylosoxidans, and Azotobacter chroococcum. The selected strains were grown at different NaC1 concentrations (0-600 mmol L-1 in N-free broth and 0-2 000 mmol L-1 in Luria-Bertani medium) in the presence and absence of glycine betaine (GB), aqueous and hydro -alcoholic extracts from marine macroalgae, Ulva lactuca and Enteromorpha intestinalis, and Opuntia ficus-indica cladodes. The selected bacterial strains, GB, and the aforementioned extracts were tested for their ability to promote the germination of wheat (Triticum durum) seeds at 0-300 mmol L-1 NaCl. Compared with the results obtained with the synthetic osmoprotectant GB, the extracts from 0. ficus-indica, U. lactuca, and E. intestinalis significantly promoted bacterial growth and seed germination under salt stress.

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