02008naa a2200277 a 450000100080000000500110000800800410001902400510006010000250011124501210013626000090025752011700026665000180143665000190145465000250147365000150149865000200151365000100153365300250154365300260156870000180159470000180161270000180163070000210164877300610166921301582021-02-19       2020    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.18512/rbms2020v19e11882DOI1 aGUIMARÃES, M. J. M.  aGas exchange and enzymatic metabolism in grain sorghum varieties irrigated with saline water.h[electronic resource]  c2020  aThe objective of this study was to evaluate the effect of irrigation water salinity on gas exchange and antioxidative system responses of grain sorghum varieties. An experiment was conducted in a greenhouse located at the headquarters of Embrapa Semiarid Agriculture, Petrolina-PE, Brazil. The experimental design was randomized blocks, in a 6 x 5 factorial scheme. Six varieties of grain sorghum irrigated with saline water with five levels of salinity were evaluated. Photosynthesis and transpiration rate, stomatal conductance, leaf temperature, intrinsic and instantaneous water use efficiency, relative water content and leaf turgor potential were evaluated, as well as the activity of the enzymes catalase, ascorbate peroxidase and superoxide dismutase, and shoot biomass production. It was observed that irrigation with saline water causes reduction in the gas exchange and water status of grain sorghum varieties. The antioxidative system was activated in the six sorghum varieties to avoid the accumulation of reactive oxygen species, and the synchronism between the enzymes led to a better response of shoot dry mass production of the Ponta Negra variety.  aGrain sorghum  aWater salinity  aÁgua de Irrigação  aSalinidade  aSorghum Bicolor  aSorgo  aEfeito da salinidade  aSistema antioxidativo1 aSIMOES, W. L.1 aTABOSA, J. N.1 aCAMARA, T. R.1 aWILLADINO, L. G.  tRevista Brasileira de Milho e Sorgogv. 19, e1188, 2020.