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Evaluation of Iraqi Rice Cultivars for Their Tolerance to Drought Stress
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2020 (English)In: Agronomy, E-ISSN 2073-4395, Vol. 10, no 11, article id 1782Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 10, no 11, article id 1782
Keywords [en]
rice cultivars, drought stress, transcription factors, chlorophyll content, shoot and root length, qRT PCR
National Category
Genetics and Breeding in Agricultural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-178088DOI: 10.3390/agronomy10111782ISI: 000592871800001Scopus ID: 2-s2.0-85108805723OAI: oai:DiVA.org:umu-178088DiVA, id: diva2:1514632
Available from: 2021-01-07 Created: 2021-01-07 Last updated: 2023-03-23Bibliographically approved

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Imran, Qari Muhammad

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