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3. Halotolerant Pseudomonas koreensis S4T10 mitigate salt and drought stress in Arabidopsis thaliana.

Author

Kalleku, Justine Nathanael, Ihsan, Samsoor, Al-Azzawi, Tiba Nazar Ibrahim, Khan, Murtaza, Hussain, Adil, Chebitok, Felistus, Das, Ashim Kumar, Yong-Sun Moon, Bong-Gyu Mun, In-Jung Lee, Ali, Sajid, and Byung-Wook Yun

Subjects
ARABIDOPSIS thaliana, POLYPHENOL oxidase, DROUGHT management, DROUGHTS, PHOTOSYNTHETIC pigments, REACTIVE oxygen species, PLANT biomass
Abstract

Salt and drought are documented among the most detrimental and persistent abiotic stresses for crop production. Here, we investigated the impact of Pseudomonas koreensis strain S4T10 on plant performance under salt and drought stress. Arabidopsis thaliana Col-0 wild type and atnced3 mutant plants were inoculated with P. koreensis or tap water and exposed to NaCl (100 mM) for five days and drought stress by withholding water for seven days. P. koreensis significantly enhanced plant biomass and photosynthetic pigments under salt and drought stress conditions. Moreover, P. koreensis activated the antioxidant defence by modulating glutathione (GSH), superoxide dismutase (SOD), peroxidase (POD), and polyphenol oxidase (PPO) activities to scavenge the reactive oxygen species produced due to the stress. In addition, the application of P. koreensis upregulated the expression of genes associated with antioxidant responses, such as AtCAT1, AtCAT3, and AtSOD. Similarly, genes linked to salt stress, such as AtSOS1, AtSOS2, AtSOS3, AtNHX1, and AtHKT1, were also upregulated, affirming the positive role of P. koreensis S4T10 in streamlining the cellular influx and efflux transport systems during salt stress. Likewise, the PGPB inoculation was observed to regulate the expression of drought-responsive genes AtDREB2A, AtDREB2B, and ABA-responsive genes AtAO3, AtABA3 indicating that S4T10 enhanced drought tolerance via modulation of the ABA pathway. The results of this study affirm that P. koreensis S4T10 could be further developed as a biofertilizer to mitigate salt and drought stress at the same time. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Alleviation of Hg-, Cr-, Cu-, and Zn-Induced Heavy Metals Stress by Exogenous Sodium Nitroprusside in Rice Plants

Author

Niyoifasha, Chrizostom Julius, primary, Borena, Birhanu Miressa, additional, Ukob, Irasapa Tanimu, additional, Minh, Phan Ngoc, additional, Al Azzawi, Tiba Nazar Ibrahim, additional, Imran, Muhammad, additional, Ali, Sajid, additional, Inthavong, Anousone, additional, Mun, Bong-Gyu, additional, Lee, In-Jung, additional, Khan, Murtaza, additional, and Yun, Byung-Wook, additional

Published
2023
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8. Exogenously Applied Sodium Nitroprusside Mitigates Lead Toxicity in Rice by Regulating Antioxidants and Metal Stress-Related Transcripts

Author

Rahim, Waqas, primary, Khan, Murtaza, additional, Al Azzawi, Tiba Nazar Ibrahim, additional, Pande, Anjali, additional, Methela, Nusrat Jahan, additional, Ali, Sajid, additional, Imran, Muhammad, additional, Lee, Da-Sol, additional, Lee, Geun-Mo, additional, Mun, Bong-Gyu, additional, Moon, Yong-Sun, additional, Lee, In-Jung, additional, and Yun, Byung-Wook, additional

Published
2022
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12. Evaluation of Iraqi Rice Cultivars for Their Tolerance to Drought Stress

Author

Al Azzawi, Tiba Nazar Ibrahim, Khan, Murtaza, Hussain, Adil, Shahid, Muhammad, Imran, Qari Muhammad, Mun, Bong-Gyu, Lee, Sang-Uk, Yun, Byung-Wook, Al Azzawi, Tiba Nazar Ibrahim, Khan, Murtaza, Hussain, Adil, Shahid, Muhammad, Imran, Qari Muhammad, Mun, Bong-Gyu, Lee, Sang-Uk, and Yun, Byung-Wook

Abstract

Drought stress is a serious problem around the globe and particularly in the Republic of Iraq. Rice is the third most consumed crop for the Iraqi people; however, its cultivation and production is very low due to several challenges including drought. The current study was performed to evaluate five Iraqi rice cultivars along with relevant (drought-tolerant and drought-susceptible) controls under drought stress, either by treatment with 10% PEG (polyethylene glycol) or through water withholding to induce natural drought stress. The phenotypes of all the cultivars were evaluated and the transcriptional responses of key drought-responsive candidate genes, identified through the EST-SSR marker-based approach, were studied. We also studied transcript accumulation of drought-related transcriptional factors, such as OsGRASS23, OsbZIP12, and OsDREB2A. Moreover, the reference cultivars also included a drought-tolerant inter-specific cultivar Nerica 7 (a cross between Oryza sativa ssp. indica X O. glaberrima). Among the cultivars, the more drought-tolerant phenotypic characteristics and higher transcript accumulation of drought-related marker genes OsE647 and OsE1899 and transcriptional factors OsGRASS23, OsbZIP12, and OsDREB2A were observed in four (out of five) significantly drought-tolerant Iraqi cultivars; Mashkab, followed by Furat, Yasmen, and Amber 33. On another note, Amber Barka was found to be significantly drought susceptible. Mashkab and Amber Barka were found to be the most drought-tolerant and-susceptible cultivars, respectively. The identified tolerant cultivars may potentially serve as a genetic source for the incorporation of drought-tolerant phenotypes in rice.

Published
2020
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