盐胁迫下两草种SOD和POD及脯氨酸动态研究

在NaCl、KCl、MgSO₄及其复合盐胁迫下, 研究草坪草-金牌美达丽(Lolium perenne)和猎狗(Fesluca elata) 中脯氨酸含量、超氧化物歧化酶和过氧化物酶活性的变化。结果表明:不同盐分、不同浓度胁迫下脯氨酸含量呈波动式变化, 其峰值出现在较高浓度下, 说明在一定范围内盐胁迫强度越大脯氨酸积累越明显;SOD 的最高值出现在低浓度下, 而最低值无此特点, 不同盐胁迫下的最高值、最低值相差不多, 说明L.perenne 和F.elata 相差不明显;POD 活性随盐浓度增加呈波动性变化, L.perenne (除KCl)和F.elata (除MgSO₄)最高值均出现在低浓度下, L.perenne 的最低值集中在高浓度, 而F.elata 的最低值则集中在低浓度, F.elata在高浓度胁迫下, 处于一个比较稳定的水平, 高于或接近CK, 且各值比较接近, 而在L.perenne 中却没有这一结果。

Changes in SOD and POD activity and free proline content of Lolium perenne and Festuca elata leaves under different levels of salt stress

The effects of different concentrations of NaCl, KCl, MgSO₄ and their mixture on free proline, SOD, POD activity of two kinds of turf grasses were studied.The results showed that the content of free proline waved under different salts and concentrations.That the maximum appeared at higher concentration inferred that the accumulation of prolinewas dominant with the increase of salt stress in some extend;The maximum of SOD appeared at lower concentration while the minimum hasn't the characteristic and the difference of SOD activity in L.perenne and F.elata is insignificant under different salt stress;POD activity waved with the salt concentration increased and its maximum appeared at lower concentration under different treatments except KCl (in L.perenne)and MgSO₄ (in F.elata).POD activity in L.perenne concentrated on higher concentration, however that of F.elata concentrated on lower concentration.Stressed under higher concentration, POD in F.elata was kept at a stable level that is higher than CK and every data approach, but there isn't the result inL.perenne