Exploring Halotolerant Rhizomicrobes as a Pool of Potent Genes for Engineering Salt Stress Tolerance in Crops

  • Neveen B. Talaat


Soil salinization is a constant threat to crop productivity and ecology worldwide. The conventional approach, breeding salt-tolerant plant cultivars, has often failed to efficiently alleviate this devastating environmental stress factor. In contrast, the use of a diverse array of microorganisms harbored by plants has attracted increasing attention because of the remarkable beneficial effects of them on plants. Among these microorganisms, halophilic and halotolerant rhizomicrobes is one of the most important extremophilic microorganisms. They can be found in saline or hypersaline ecosystems and have developed different adaptations to survive in salty environments. Their proteins and encoding genes are magnificently engineered to function in a milieu containing 2–5 M salt and represent a valuable repository and resource for reconstruction and visualizing processes of habitat selection and adaptive evolution. Indeed, the natural occurrence of these microorganisms in saline soils opens up a possible important role of them in increasing the salt tolerance in crops. They are capable of eliciting physical, chemical, and molecular changes in plants which enhanced their tolerance and promoted their growth, and thus they can refine agricultural practices and production under saline conditions. Likewise, their ability to serve as bioinoculants could be a more ready utilizable and sustainable solution to ameliorate the deleterious salt effects on plants. However, the ecology of their interactions with plants is still under investigation and not fully understood. This chapter aims to introduce the halotolerant rhizomicrobes and shed light on their special mechanisms to adapt to salinity conditions. A special section would be dedicated for their potential to be exploited in engineering salt tolerance in crops.


Halotolerant rhizomicrobes Plant halotolerant-microbe interaction Plant salt tolerance Salt stress 



1-Aminocyclopropane-1-carboxylic acid


Arbuscular mycorrhizal fungi


Ascorbate peroxidase




Dehydroascorbate reductase




Guaiacol peroxidase


Glutathione reductase


Indole acetic acid






Monodehydroascorbate reductase


Mannitol 1-phosphate dehydrogenase


3-Phosphoglycerate dehydrogenase


Plant growth-promoting rhizobacteria


Quaternary ammonium compounds


Reactive oxygen species


Serine hydroxymethyltransferase


Superoxide dismutase


Salt overly sensitive


Volatile organic compounds


Vegetative storage protein 2


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Neveen B. Talaat
    • 1
  1. 1.Department of Plant Physiology, Faculty of AgricultureCairo UniversityGizaEgypt

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