Contrasting Responses of Guar Genotypes Shed Light on Multiple Component Traits of Salinity Tolerance Mechanisms

Guar (Cyamopsis tetragonoloba (L.) Taub.) is a legume crop, and gum derived from its seeds has various industrial applications. Due to tolerance abiotic stresses, guar can be grown under water-deficit or high-salinity conditions. In this investigation, four diverse genotypes that performed at similar level in field conditions were evaluated salinity experiment the greenhouse lysimeter system. Based on salt index (STI) for shoot biomass, root length, Matador PI 268229 classified as salt-tolerant, 340261 537281 salt-sensitive. Leaf Na concentrations 4- 5.5-fold higher, leaf Cl 1.6- 1.9-fold higher salt-sensitive lines than salt-tolerant salinity. The strong associations between K compared control (K-salinity/K-control) ratio STI stem length advocate importance of K-salinity/K-control total concentrations. expression analyses genes involved Na+ Cl? transport revealed different component traits mechanisms, such exclusion Na+/Cl? root, sequestration vacuoles, retrieval xylem during stress, root-to-shoot translocation, K+-Na+ homeostasis.