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菊芋悬浮细胞对盐胁迫的生理响应

Physiological Response of Suspension Cells of Helianthus tuberosus to NaCl Stress

  • 摘要: 为探讨菊芋(Helianthus tuberosus)悬浮培养细胞对盐胁迫的生理响应,在0、50、100、150、200 mmol·L-1NaCl处理下测定了细胞的生物量、相对细胞活力、抗氧化酶活性以及过氧化氢、丙二醛、脯氨酸、可溶性糖、可溶性蛋白质的含量,测定了总酚含量并鉴别、定量分析了14种酚类化合物。结果表明:盐胁迫显著减弱了菊芋悬浮细胞的活力,抑制了细胞的增长,200 mmol·L-1NaCl处理下细胞生长基本上停止。盐胁迫诱发了细胞氧化胁迫,丙二醛含量显著增加,抗坏血酸过氧化物酶、过氧化物酶活性以及总酚含量、部分酚类化合物含量均随NaCl浓度升高而增加,酚类物质和抗氧化酶系统共同参与了应对氧化胁迫的抗氧化作用。脯氨酸在菊芋悬浮细胞应对NaCl渗透胁迫的渗透调节作用中扮演了重要的角色,而可溶性糖发挥的作用不大。

     

    Abstract: To investigate the physiological response of Helianthus tuberosus suspension cells to salt stress, biomass, viability, activity of antioxidant enzyme, the contents of hydrogen peroxide, malonaldehyde, proline, soluble sugar, soluble protein, total phenols were measured, and 14 phenolic compounds of suspension cells were analyzed under the treatments of 0, 50, 100, 150 and 200 mmol·L-1 NaCl. The salt stress markedly weakened the H.tuberosus suspension cell viability, and the growth of suspension cells was obviously inhibited. Under the condition of 200 mmol·L-1NaCl treatment, suspension cells almost stopped growing. Salt stress induced the oxidative stress, the content of malonaldehyde significantly increased, the activity of ascorbate peroxidase, peroxidase, the content of total phenols and part phenolic compounds increased with the increasing concentration of NaCl. Both phenolic compounds and antioxidant enzyme system participated in antioxidative process. Proline played an important role in the osmoregulation of H.tuberosus suspension cells responding to NaCl osmotic stress, meanwhile, the soluble sugar had little effect.

     

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