Shoot chloride exclusion and salt tolerance in grapevine is associated with differential ion transporter expression in roots

摘要

BackgroundSalt tolerance in grapevine is associated with chloride (Cl⁻) exclusion from shoots; the rate-limiting step being the passage of Cl⁻ between the root symplast and xylem apoplast. Despite an understanding of the physiological mechanism of Cl⁻ exclusion in grapevine, the molecular identity of membrane proteins that control this process have remained elusive. To elucidate candidate genes likely to control Cl⁻ exclusion, we compared the root transcriptomes of three Vitis spp. with contrasting shoot Cl⁻ exclusion capacities using a custom microarray.