Journal Title
Title of Journal: Tropical Plant Biol
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Abbravation: Tropical Plant Biology
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Authors: Osman Radwan Jie Arro Caroline Keller Schuyler S Korban
Publish Date: 2015/11/07
Volume: 8, Issue: 3-4, Pages: 74-86
Abstract
The ability of date palm tree to survive under adverse abiotic conditions renders it as a valuable genomic resource for identifying tolerance genes While mechanisms for salt tolerance have been heavily investigated in model as well as in some agronomic crops no such studies have been undertaken in date palm The aim of this study is to identify stress tolerancerelated genes through transcriptomic analysis to support further functional studies Young roots of Deglet Beida cultivar have been subjected to salt stress treatment and used for RNASeq expression profiling and transmission electron microscopy TEM analysis A total of 1939 genes are found to be differentially expressed between mocktreated roots and saltstressed roots using log2FC ≥15≤−15 Many of these regulatory genes belong to DNA/RNA protein membrane and signaling functional categories suggesting that these genes play functional roles in tolerance to salt stress Furthermore RNASeq analysis has revealed activation of abscisic acid signaling pathways through SNF1related protein kinases 2 Additionally certain key genes involved in sodium uptake and transport are downregulated suggesting a potential mechanism for slowing down uptake and transport of salt solutes within plant tissues TEM analysis has revealed that stressed roots exhibit plasmolysis in cortical cells of the distal region while epidermal cells do not Interestingly roottip regions of stressed roots do not exhibit plasmolysis and this is likely due to higher solute contents present in these sink cells These findings provide new information on multidimensional responses of date palm to salinity stress
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