Ion Transport Genes may be Related to Grapevine Shoot Cholide Exclusion and Salt Tolerance
October 29, 2014| |
Salt tolerance in grapevine is associated with shoot chloride (Cl-) exclusion in shoots. Despite the knowledge of Cl exclusion in grapevine, the mechanism of this process has remained elusive. To search for candidate genes that control Cl exclusion, researchers led by Matthew Gilliham of the University of Adelaide in Australia compared three Vitis spp. with contrasting shoot Cl exclusion capacities using custom microarray.
Under 50mM Cl- conditions, the genotypes 140 Ruggeri (shoot Cl- excluding rootstock), K51-40 (shoot Cl- including rootstock) and Cabernet Sauvignon (intermediate shoot Cl- excluder) showed different transcriptional changes in their roots. The level of change was found to be correlated with the amount of Cl- accumulated in shoots. Despite these differences, no Cl- transporters were identified. However, under control conditions, genes for putative ion channels as well as members of NRT1 and CLC families were differentially expressed between rootstocks.
Results show that the Cl- exclusion mechanism in grapevine are not stress-inducible, but are constitutively different between varieties. The team has identified individual genes from large families known for anion transport as likely candidates for Cl- exclusion in Vitis species.
For more information on this study, read the full article here http://www.biomedcentral.com/content/pdf/s12870-014-0273-8.pdf.
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