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以松前水稻为试验材料,研究了5种浓度萘污染土壤对松前水稻生长和生理生化指标的影响,以及植物成熟期时土壤中萘的残留。结果表明:①萘浓度低于20mg·kg-1时促进幼苗茎径、茎长、株高的生长,高浓度对其生长有显著的抑制作用。②萘胁迫对水稻叶片游离脯氨酸和蛋白质代谢均有一定的影响,且影响程度以苗期最为明显,其次是分蘖期和拔节期;水稻幼苗阶段萘的高浓度组MDA累积量极显著高于对照,水稻幼苗阶段受到膜脂过氧化影响较为显著,分蘖期次之;拔节期水稻开始新生器官,抗性较弱,萘胁迫产生的过氧化作用超过了水稻的承受范围,使SOD活性显著降低。③在试验所设萘浓度范围内,水稻各生长期叶片叶绿素和光合作用速率均呈不同的变化趋势,但是变化幅度均不超过对照的±5%,说明萘胁迫对松前水稻的光合作用没有显著影响,水稻对萘胁迫有一定的耐受性。④经过水稻一个生长周期,萘在种子中的残留量最多,其次是根部,且土壤中萘各浓度组的残留量与对照组均无显著差异;水稻根部和种子中萘的含量均随萘浓度的增加呈先增加后逐渐降低趋势,但各浓度组均高于对照组,20mg·kg-1时均达到最大值,分别为对照组的0.37倍、4.27倍。
The effects of five concentrations of naphthalene-contaminated soil on the growth and physiological and biochemical indexes of Pinus elliottii and the residues of naphthalene in the soil during maturity of plant were studied using the loose-leaf rice as test material. The results showed that: ① When the naphthalene concentration was lower than 20 mg · kg-1, the stem diameter, stem length and plant height of the seedlings were promoted. The high concentration of naphthalene significantly inhibited the growth of the seedlings. ②Naphthalene stress had a significant effect on free proline and protein metabolism in rice leaves, and the most significant effect was on the seedling stage, followed by the tillering stage and jointing stage. The MDA accumulation of the high concentration of naphthalene in seedling stage was extremely high In contrast, the rice seedling stage was significantly affected by membrane lipid peroxidation, followed by the tillering stage. At the jointing stage, rice started to have new organs, and its resistance was weak. The peroxidation by naphthalene stress exceeded the tolerance range of rice and the SOD activity was significant reduce. ③ Within the range of the concentration of naphthalene tested, the leaf chlorophyll and photosynthetic rate of rice showed different trend at different growth stages, but the change range was no more than ± 5% of the control, indicating that naphthalene stress had no significant effect on photosynthesis of pine Affected, rice has some tolerance to naphthalene stress. ④ After one growth cycle of rice, naphthalene residues in the seeds were the most, followed by the roots, and the naphthalene concentrations in the soil residual groups and the control group were no significant difference; naphthalene content in roots and seeds of rice with naphthalene concentration Increased first and then decreased gradually, but the concentration of each group were higher than the control group, reaching the maximum at 20mg · kg-1, respectively 0.37 times and 4.27 times of the control group.