苏丹草对^(133)Cs和^(88)Sr胁迫响应及吸收积累特征研究

Study on the stress responses and the characteristics of uptake and accumulation of Sorghum sudanense to ^(133)Cs and ^(88)Sr

通过露地盆栽试验研究了苏丹草对土壤中不同浓度133Cs、88Sr胁迫的响应,以及对133Cs、88Sr的吸收积累。结果表明:在低浓度133Cs或88Sr胁迫下,苏丹草抗逆性增强,体内MDA含量降低,POD、CAT活性升高。在高浓度133Cs或88Sr胁迫下,苏丹草体内产生过量的活性氧使细胞膜脂质过氧化作用增强,MDA含量升高,CAT和POD活性下降。叶绿素含量随处理浓度增加而降低,表明胁迫条件下叶绿素合成受阻。土壤中高浓度133Cs与88Sr对苏丹草有毒害作用,使植株收到损伤,但对苏丹草的生物量影响不大。随着处理浓度增加,苏丹草体内133Cs或88Sr含量增加,并且根系含量>地上部含量,88Sr含量>133Cs含量。

The physiological responses to 133Cs and 88Sr stress and the characteristics of uptake and accumulation of 133Cs and 88Sr by Sorghum sudanense were studied by pot experiments. The results show that under the low concentration of 133Cs or 88Sr stress, the stress-resistance of Sorghum sudanense increases, the content of MDA decreases and the activities of POD and CAT increase. Under the high concentration of 133Cs or 88Sr stress, the lipid peroxidation are strengthened, the content of MDA increases and the activities of POD and CAT decrease. Along with the increment of concentration, the contents of chlorophyll decrease meanwhile the synthesis of chlorophyll in Sorghum sudanense is inhibited under the stress. High concentration of 133CS and 88Sr has toxicity to Sorghum sudanense and has done the damage to the plant. However, there are no significant effects on the biomass of Sorghum sudanense. Along with the increment of concentration, the contents of 133Cs or 88Sr increase in Sorghum sudanense, and the relationship of the contents： roots〉 the part above-ground, 88Sr〉133Cs.