Restoration of Growth of Durum Wheat (Triticum durum var. waha) Under Saline Conditions Due to Inoculation with the Rhizosphere Bacterium Azospirillum brasilense NH and Extracts of the Marine Alga Ulva lactuca

Journal of Plant Growth Regulation - Tập 29 - Trang 6-22 - 2009
Elhafid Nabti1, Mohamed Sahnoune2, Mostefa Ghoul3, Doreen Fischer4, Andreas Hofmann4, Michael Rothballer4, Michael Schmid4, Anton Hartmann4
1Department of Microbiology, Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Bejaïa, Algeria
2Department of Biology of Organisms and Populations, Laboratory of Ecology and Environment, Faculty of Nature and Life Sciences, University of Bejaïa, Bejaïa, Algeria
3Department of Biology, Laboratory of Bacterial Ecology, Faculty of Biology, University of Setif, Setif, Algeria
4Department Microbe-Plant Interactions, German Research Center for Environmental Health (GmbH), Helmholtz Zentrum München, Neuherberg, Germany

Tóm tắt

Inoculation with the rhizosphere bacterium Azospirillum brasilense NH, originally isolated from salt-affected soil in northern Algeria, greatly enhanced growth of durum wheat (Triticum durum var. waha) under saline soil conditions. Important plant parameters like the rate of germination, stem height, spike length, dry weight of roots and shoots, chlorophyll a and b content, proline and total sugar contents, 1000-seed weight, seed number per spike, and weight of seeds per spike were measured. At salt stress conditions (160 and 200 mM NaCl) A. brasilense NH restored almost completely vegetative growth and seed production. The combination with extracts of the marine alga Ulva lactuca resulted in even more improved salt tolerance of durum wheat. Proline and total sugar accumulation, a sign of physiological plant stress under inhibitory salt conditions, was reduced in plants inoculated with A. brasilense NH with and without addition of algal extracts. Inoculation with the salt-sensitive A. brasilense strain Sp7 could not restore salt-affected plant growth at 200 mM NaCl. Furthermore, it could be demonstrated by fluorescence in situ hybridization and confocal laser scanning microscopy that A. brasilense NH is able to colonize roots of durum wheat endophytically under salt-stressed conditions. Thus, the salt-tolerant rhizobacterium A. brasilense NH could effectively provide alone or in combination with extracts of U. lactuca a promising solution to overcome salt inhibition which is a major threat hindering productive wheat cultivation in arid saline soils.

Tài liệu tham khảo

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