Plant growth-promoting bacteria confer resistance in tomato plants to salt stress

Plant Physiology and Biochemistry : PPB
Shimon MayakBernard R Glick

Abstract

The object of the work is to evaluate whether rhizobacteria populating dry salty environments can increase resistance in tomato to salt stress. Seven strains of plant growth-promoting bacteria that have 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity were isolated from soil samples taken from the Arava region of southern Israel. Following growth of these seedlings in the presence of 43 mM NaCl for 7 weeks, the bacterium that promoted growth to the greatest extent was selected for further study. DNA analysis of the 16S RNA indicated that the selected bacterium was Achromobacter piechaudii. This bacterium significantly increased the fresh and dry weights of tomato seedlings grown in the presence of up to 172 mM NaCl salt. The bacterium reduced the production of ethylene by tomato seedlings, which was otherwise stimulated when seedlings were challenged with increasing salt concentrations, but did not reduce the content of sodium. However, it slightly increased the uptake of phosphorous and potassium, which may contribute in part to activation of processes involved in the alleviation of the effect of salt. In the presence of salt the bacterium increased the water use efficiency (WUE). This may suggest that the bacterium ...Continue Reading

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Citations

Mar 3, 2011·Applied Microbiology and Biotechnology·Myriam S ZawoznikMaría D Groppa
Jul 20, 2011·Applied Microbiology and Biotechnology·S Vilchez, Maximino Manzanera
Aug 19, 2007·Current Microbiology·Analía PríncipeEdgardo Jofré
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Jul 19, 2012·World Journal of Microbiology & Biotechnology·Mei-Xia WangShu-Zhen Yan
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Dec 7, 2007·Canadian Journal of Microbiology·Youai HaoBernard R Glick
Apr 5, 2008·Canadian Journal of Microbiology·Zhenyu ChengBernard R Glick
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