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Crops are increasingly affected by drought; hence, the current study explored the potential role of three desert endophytic fungi, Aspergillus fumigatus, Aspergillus terreus and Talaromyces variabilis, in conferring drought tolerance in tomato plants.

Preserved endophytic fungi from a Rhazya stricta desert plant were adopted to obtain the required fungal treatment; tomatoes received fungal treatments directly in plastic trays and subsequently in pots. Drought was applied using 15% of PEG-6000 at two stages: flowering and fruiting. The following parameters were measured: pollen sterility, growth characteristics, morphological analysis and biochemical analysis, including proline, gibberellic acid (GA3) and chlorophyll measurements; thus, the data were analyzed statistically using SPSS software.

All applied endophytes significantly promoted pollen viability and tomato yield under stressed and nonstressed conditions. Interestingly, these endophytes significantly enhanced the number of trichomes under drought stress and promoted tomato fruit quality. The colonized tomato plants accumulated a high proline level under drought stress but lower than un-inoculated stressed plants. Also, a significant rise in growth characteristics was observed by A. fumigatus and A. terreus under normal conditions. Moreover, both raised GA3 levels under drought-stressed and nonstressed conditions. Also these two endophytes enhanced chlorophyll and carotenoid contents under drought stress. Fruit characteristics were enhanced by nonstressed T. variabilis and stressed A. fumigatus.

The present endophytic fungi provide impressive benefits to their host in normal and drought-stressed conditions. Consequently, they represent valuable sources as sustainable and environmentally friendly alternatives to mitigate drought stress.

The purpose of this paper is to assess the potential of renewable energy as an essential future energy source in the Gulf Cooperation Council (GCC) region. This paper summarizes the main projects and measures established to start the transition toward renewable energy. The opportunities and challenges for developing renewable energy projects have been discussed to reach a better understanding of the future of renewable energy in the region.

The paper provides a literature-based study on the status of the renewable energy sector in the GCC, including potentials, projects, targets and strategies. The opportunities and challenges of the development of renewable energy sources in the GCC region have been discussed based on the literature.

The paper shows that the GCC countries have begun to adopt a more proactive approach toward renewable energy, while the reorientation of strategies and plans for renewable energy is evolving in these countries. All of the GCC countries focus on solar and wind energies and plan to invest in waste-to-energy (WtE), while only Saudi Arabia is interested in going for geothermal.

The paper contributes to the provision of an extensive literature review on the development of renewable energy in the GCC countries. It provides an updated and comprehensive overview of the region’s renewable energy potential and highlights the main renewable energy strategies and targets. This paper targets regional decision-makers as well as multilateral stakeholders to formulate a set of recommendations to promote renewable energy deployment and improve industrial capabilities.