Physiological characteristic of 10 sorghums genotypes under water stress in greenhouse

Abstract

Selection to screen sorghum accessions tolerance to drought condition was conducted. The experiment was conducted in the glasshouse on 10 sorghum accession using a Randomized Block Design, on July to October 2017. Three water treatments were used i.e., 30% of field capacity (FC), 50% FC and 80% FC, with 3 replicates for each treatment. The results indicated that N6.12 was very sensitive to drought with water potential of -6.45 MPa at 30% FC and - 6.22 MPa at 50% FC, while Jagung Rote was very resistant with water potential of - 4.23 at 30% FC, followed by Suri 3 with - 3.33 at 50% FC. The two accessions with the lowest photosynthetic rates were Super 1 and WR with 8,618090455 and 8,158083096 µmol m-2 s-1, respectively. The three highest photosynthetic rates were shown by Suri 3 (14.32254207 µmol m-2 s-1), Jagung Rote (15.37299675 µmol m-2 s-1), and UPCA (11.87406017 µmol m-2 s-1). Sorghum with the lowest biomass production were Buleleng Empok (26.61 g plant-1) and the highest was WR (57.17 g plant-1). The lowest plant height was UPCA and the highest was Suri 4. We concluded that Jagung Rote and Suri 3 were the most tolerant sorghum accessions to drought according to their leaf water potentials and photosynthetic rates.