Change in catalase activity was examined in leaves of rice plant exposed to salinity. Depending on the method of preparation of crude protein extract from leaf and the constituents of the assay medium, a significant d...Change in catalase activity was examined in leaves of rice plant exposed to salinity. Depending on the method of preparation of crude protein extract from leaf and the constituents of the assay medium, a significant difference in enzyme activity was recorded. Inclusion of sorbitol or mannitol or sucrose in the extraction and enzyme assay medium enhanced the enzyme activity in salt-stressed samples by nearly 1.5-1.8 fold, compared to the activity found in un- stressed plants, which otherwise showed a 50% declined activity in leaf extract prepared in buffer solution and assayed in a medium depleted of these sugars. In view of the accumulation of osmolytes under saline condition, these observations suggest that the catalase activity is modulated by the osmolytes and maintains a high rate of hydrogen peroxide scavenging property in vivo and serves as the major antioxidant enzyme to scavenge the salt-induced formation of peroxide. Therefore, the salt-stress induced appearance of low activity of the enzyme under normal buffer extraction and assay conditions, as reported in literature may represent an apparent than for its real in vivo activity.展开更多
为深入了解施用氯化钠(NaCl)对椰子幼苗生理特性的影响,通过施用不同量的NaCl,30 d后测定叶绿素含量、丙二醛(MDA)含量、可溶性糖含量、脯氨酸含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性。结果显示:施用100 g和1...为深入了解施用氯化钠(NaCl)对椰子幼苗生理特性的影响,通过施用不同量的NaCl,30 d后测定叶绿素含量、丙二醛(MDA)含量、可溶性糖含量、脯氨酸含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性。结果显示:施用100 g和150 g NaCl时,叶绿素含量显著升高,MDA和可溶性糖含量明显降低,POD、SOD和CAT活性显著增加,脯氨酸含量少量增加;200 g NaCl处理条件下叶绿素含量显著降低,MDA和可溶性糖含量明显减少,SOD和CAT活性显著降低,脯氨酸含量显著增加。试验表明适量施用NaCl可以增强椰子幼苗光合作用,抑制膜脂过氧化,促进物质转化等。展开更多
文摘Change in catalase activity was examined in leaves of rice plant exposed to salinity. Depending on the method of preparation of crude protein extract from leaf and the constituents of the assay medium, a significant difference in enzyme activity was recorded. Inclusion of sorbitol or mannitol or sucrose in the extraction and enzyme assay medium enhanced the enzyme activity in salt-stressed samples by nearly 1.5-1.8 fold, compared to the activity found in un- stressed plants, which otherwise showed a 50% declined activity in leaf extract prepared in buffer solution and assayed in a medium depleted of these sugars. In view of the accumulation of osmolytes under saline condition, these observations suggest that the catalase activity is modulated by the osmolytes and maintains a high rate of hydrogen peroxide scavenging property in vivo and serves as the major antioxidant enzyme to scavenge the salt-induced formation of peroxide. Therefore, the salt-stress induced appearance of low activity of the enzyme under normal buffer extraction and assay conditions, as reported in literature may represent an apparent than for its real in vivo activity.
文摘为深入了解施用氯化钠(NaCl)对椰子幼苗生理特性的影响,通过施用不同量的NaCl,30 d后测定叶绿素含量、丙二醛(MDA)含量、可溶性糖含量、脯氨酸含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性。结果显示:施用100 g和150 g NaCl时,叶绿素含量显著升高,MDA和可溶性糖含量明显降低,POD、SOD和CAT活性显著增加,脯氨酸含量少量增加;200 g NaCl处理条件下叶绿素含量显著降低,MDA和可溶性糖含量明显减少,SOD和CAT活性显著降低,脯氨酸含量显著增加。试验表明适量施用NaCl可以增强椰子幼苗光合作用,抑制膜脂过氧化,促进物质转化等。