Water relations in different guar (Cyamopsis tetragonoloba (L.) Taub)genotypes under water stress

Water relations of four guar genotypes viz., S-807, Esser, Brooks and S-1183 under different water regimes at pre-flowering, post-flowering andterminal drought were studied in cemented tanks under natural conditions.Water deficit reduced yield relative water content (RWC), leaf osmotic potential(OP), leaf water potential (WP), turgor potential JP) in all four guar genotypesused. However, the genotypes S-807 and Esser had comparatively higher yieldRWC, turgor potential under all water stresses than Brooks and S-1183.Maximum reduction in all parameters was recorded under terminal drought. Thedifferences between pre- and post-flowering stresses were non-significant incase of yield and RWC but significant in other parameters. Genotypes withhigher RWC and turgor potential had higher seed weight.