Physiological Characteristics to Indicate Water Use Efficiency and Drought Tolerance of 30 Indonesian Sorghum [Sorghum bicolor (L.) Moench] Accessions

Water use efficiency (WUE) is an essential subject in drought-restricted agricultures. Physiological parameters can be used to understand plant efficiencies water usage. This research aimed the physiological characteristics of 30 Indonesian sorghum accessions (Sorghum bicolor (L.) Moench), which indicate WUE and drought tolerance. Field was conducted at Cibinong Science Center, National Research Innovation Agency (BRIN) using Randomized Block Design with 3 replicates. Experimental included photosynthetic photon flux density (PPFD), stomatal conductance (GSW), (A) transpiration (E) rates, Leaf Area Index (LAI). The measured four different approaches: instantaneous (A:E), intrinsic (A:GSW), relation between biomass dry weight (BDW)/A BDW/E. Based on measurements, we concluded that could clustered into five groups, from most efficient inefficient use. We also found some cases, based single leaf measurement had a positive correlation biomass, indicating its sufficiency determining status. inconsistencies may due regarding gas exchange external stimuli (PPFD).