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    The role of NAC transcription factors in responses of plants to heat and salt stresses

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    Name:
    Nouf Alshareef Dissertation.pdf
    Size:
    7.898Mb
    Format:
    PDF
    Description:
    Nouf Alshareef Dissertation
    Embargo End Date:
    2021-05-25
    Download
    Type
    Dissertation
    Authors
    Alshareef, Nouf Owdah Hameed cc
    Advisors
    Tester, Mark A. cc
    Committee members
    Blilou, Ikram cc
    Pain, Arnab cc
    Balazadeh, Salma
    Program
    Plant Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2019-08
    Embargo End Date
    2021-05-25
    Permanent link to this record
    http://hdl.handle.net/10754/656649
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation will become available to the public after the expiration of the embargo on 2021-05-25.
    Abstract
    Soil salinity and heat stress are two major abiotic stresses affecting plant growth and yield. Transcription factors (TFs) are key regulators in stress responses. They link stress sensing with many tolerance mechanisms by translating stress signals into changes in gene expression that ultimately contribute to stress tolerance. The NAC (NAM, ATAF and CUC) TF family have been found to be involved in responses to biotic and abiotic stresses. In this PhD project, the role of NAC TFs in response to heat and salt stress was studied in the model system Arabidopsis thaliana (Arabidopsis), and in two agriculturally relevant species, Solanum lycopersicum (tomato) and Chenopodium quinoa (quinoa). Plants have the ability to acquire thermotolerance if they are pre-exposed to a mild, non-lethal high temperature. The maintenance of acquired thermotolerance for several days is known as thermomemory. Here we investigated the role of NAC TFs in thermotolerance. The expression profiles of 104 Arabidopsis NAC TFs were measured and compared between primed and unprimed plants. Some NACs with a distinctive expression pattern in response to thermopriming were selected for further phenotypic analysis. Knock-out (KO) mutants of the ATAF1 gene showed an enhanced thermomemory phenotype compared with wild type plants (WT) and from this work, the functions of the ATAF1 gene were studied further. RNAseq co-expression analyses of ATAF1 overexpressor and ataf1 KO plants found that ANAC055 expression was co-regulated with that of ATAF1. JUBGBRUNNEN1 (JUB1) is another NAC TF involved in responses to heat, drought and salinity. In this study, the role of AtJUB1 overexpression in salinity was investigated in tomato plants. AtJUB1 overexpression resulted in higher proline levels and improved maintenance of water content and biomass in AtJUB1-overexpressing plants grown hydroponically under salinity compared with WT plants. Quinoa has recently gained much attention because of its high nutritional value and high tolerance to several stresses including drought and salinity. NAC TFs are hypothesized to play a major role in quinoa’s tolerance to abiotic stresses. In this study, the NAC TFs family were identified and investigated in the genome of quinoa. 107 NAC TF genes were identified and their transcriptional responses to different stresses including salt, drought and heat were investigated.
    Citation
    Alshareef, N. O. H. (2019). The role of NAC transcription factors in responses of plants to heat and salt stresses. KAUST Research Repository. https://doi.org/10.25781/KAUST-F9RYS
    DOI
    10.25781/KAUST-F9RYS
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-F9RYS
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Dissertations; Plant Science Program

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