Title: Effects of Vanadium Stress on Physiological, Biochemical Characteristics and Enrichment Characteristics of Rice Seedlings
Abstract:Rice(Oryza.sativa L.) is one of the most important food crop in our country, and the rice yield accounts for more than half of the total grain output. Once the rice is contaminated by heavy metals, it...Rice(Oryza.sativa L.) is one of the most important food crop in our country, and the rice yield accounts for more than half of the total grain output. Once the rice is contaminated by heavy metals, its normal growth and physiological characteristics will be affected. There were little reports about effects of vanadium stress on physiological characteristics of rice plants. In the present work, the effects of different vanadium(V) concentrations(0, 4, 8, 12, 16, 20 mg·L-1) on the physiological and biochemical characteristics, and enrichment characteristics of rice seedlings(Oryza.sativa L) were investigated by hydroponics. The results showed that the contents of chlorophyll and soluble protein, catalase activity(CAT), peroxidase activity(POD), superoxide dismutase activity(SOD) firstly increased, and then decreased with increase of V press level. When V concentration was less than 12 mg·L-1, the activities of CAT, POD and SOD, increased by 77.8%、84.5% and 273.2%, the contents of chlorophyll and soluble protein increased by 135.3%、104.2% respectively, compared with the control, while they decreased by 37.2%、39.4%、41.1%、24.1% and 24.5% respectively, when V concentration was higher than 12 mg·L-1. With increase of V press level, MDA content, and cell membrane permeability increased by 38.5%~289.3% and 21.2%~303.2%, and root activity decreased by 10.9%~82.2% respectively, compared with the control. The growth of rice seedlings was stimulated, and self-protective enzymes in rice seedlings showed stronger self-regulation when V stress level was less than 12 mg ·L-1, while the synthesis of chlorophyll and protein, antioxidant enzyme activity and root activity were suppressed, the cell membrane system was hurt, and growth of rice seedlings was impeded significantly when V stress level was higher than 12 mg·L-1. The experimental results showed that the concentrations of V in different organs of rice seedlings were in sequence as follows: root stem and leave. With V level increasing, the concentrations of V in different organs increased, with a higher amplification in root than that in stem and leave, compared with the control. When V press level was increased from 5 mg·L-1 to 40 mg·L-1, concentration of V increased by 0.98~25.3 times in root, but only by 0.26~4.74 times in stem and leave. The bioconcentration factor(BF) firstly increased and then decreased, with a maximum 2.840 8, while the translocation factor(TF) decreased, with a minimum 0.117 0. It suggested that there was a strong V enrichment and low V translocation in rice seedlings, while most V was accumulated in roots, which can reduce the toxicity of V to shoots.Read More
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 1
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