Abstract
The effects of cadmium (Cd) stress on the growth and physiological characteristics were studied in 3 sorghum species viz., sweet sorghum [ Sorghum bicolor (L.) Moench. cv. Hunnigreen], sorghum hybrid sudangrass ( Sorghum bicolor × Sorghum sudanense , cv. Everlush) and sudangrass [ Sorghum sudanense ( Piper ) Stapf cv. Xinjiang]. The results show that low concentration of Cd 2+ improved the growth of sorghum plants, but high concentrations of Cd 2+ (50 mg kg −1 and 100 mg kg −1 ) significantly depressed the growth of sorghum plants; Cd stress on chlorophyll synthesis positively correlated with the Cd 2+ concentration; root activities negatively correlated with the concentration of Cd 2+ at each growth stage; the malondialdehyde (MDA) contents increased under low concentration of Cd 2+ (≤ 25 mg kg −1 ) treatment, but significantly decreased when the concentration of Cd 2+ was more than 50 mg kg −1 . Key words : Cadmium, sorghum plants, physiological characteristics.
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