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 and terminal 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 (TP) in all four guar genotypes used. However, the genotypes S-807 and Esser had comparatively higher yield RWC, turgor potential under all water stresses than Brooks and S-1183. Maximum reduction in all parameters were recorded under terminal drought. The differences between pre- and post-flowering stresses were non-significant in case of yield and RWC but significant in other parameters. Genotypes with higher RWC and turgor potential had higher seed weight.