The paper deals mainly with the difference of activities of five enzymes (hydrogen peroxidase,pyrogallic oxidase,invertase,urease and protease) in rhizosphere and non-rhizosphere soil from zinc smeltery polluted and c...The paper deals mainly with the difference of activities of five enzymes (hydrogen peroxidase,pyrogallic oxidase,invertase,urease and protease) in rhizosphere and non-rhizosphere soil from zinc smeltery polluted and control (CK) wheat lands.At the same time,the pH and different forms of elements such as N,P,K,Pb,Cd,Zn,Fe,Mn,Cu are determined.From the result,we can see that:① The pH of soil from polluted rhizosphere is higher than that of from polluted non-rhizosphere.The pH of soil from CK rhizosphere is nearly equal to that of from CK non-rhizosphere.There are same variation tendency of N,P,K between polluted soil and CK soil:The concentrations of available N and K are equal statisticly,but the concentration of available P of rhizosphere is dramaticlly higher than that of non-rhizosphere;② The main heavy metal element of polluted soil is Pb;③ The activities of five enzymes in rhizosphere soil are higher than those of non-rhizosphere soil.The difference between rhizosphere and non-rhizosphere soil enzyme activities of CK soil is bigger than that of polluted soil.This result indicates that the polluted wheat roots have a smaller rhizosphere effect;④Except of the protease,the rhizosphere soil enzyme activities of zinc smeltery polluted wheat lands are significantly higher than those of CK lands.The result indicates there are inhibitors can inhibit hydrogen peroxidase,pyrogallic oxidase,invertase,urease and activators can activate protease.So the soil enzyme activities can be used as indicators of soil pollution situation only when the enzymes are sensitive on certain pollutants.展开更多
An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on v...An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on various seedling parameters. There is no significant influence on dry matter production with the diazotrophs, Azospirillum and Azotobacter. However, the vital seedling parameters such as germination percentage and vigour index were improved. Azotobacter treatment influenced maximum of 50% germination, whereas Azospirillum and Azotobacter were on par with C. roseus with respect to their vigour index. There was significant difference in the population of total diazotrophs. Azospirillum and Azotobacter between rhizosphere and non-rhizosphere soils of C. roseus had the same trend and were observed at various locations of the study. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) were increased to a significant extent due to the treatment with diazotrophs.展开更多
文摘The paper deals mainly with the difference of activities of five enzymes (hydrogen peroxidase,pyrogallic oxidase,invertase,urease and protease) in rhizosphere and non-rhizosphere soil from zinc smeltery polluted and control (CK) wheat lands.At the same time,the pH and different forms of elements such as N,P,K,Pb,Cd,Zn,Fe,Mn,Cu are determined.From the result,we can see that:① The pH of soil from polluted rhizosphere is higher than that of from polluted non-rhizosphere.The pH of soil from CK rhizosphere is nearly equal to that of from CK non-rhizosphere.There are same variation tendency of N,P,K between polluted soil and CK soil:The concentrations of available N and K are equal statisticly,but the concentration of available P of rhizosphere is dramaticlly higher than that of non-rhizosphere;② The main heavy metal element of polluted soil is Pb;③ The activities of five enzymes in rhizosphere soil are higher than those of non-rhizosphere soil.The difference between rhizosphere and non-rhizosphere soil enzyme activities of CK soil is bigger than that of polluted soil.This result indicates that the polluted wheat roots have a smaller rhizosphere effect;④Except of the protease,the rhizosphere soil enzyme activities of zinc smeltery polluted wheat lands are significantly higher than those of CK lands.The result indicates there are inhibitors can inhibit hydrogen peroxidase,pyrogallic oxidase,invertase,urease and activators can activate protease.So the soil enzyme activities can be used as indicators of soil pollution situation only when the enzymes are sensitive on certain pollutants.
文摘An experiment was conducted on Catharanthus roseus to study the effect of seed treatments with native diazotrophs on its seedling growth and antioxidant enzyme activities. The treatments had significant influence on various seedling parameters. There is no significant influence on dry matter production with the diazotrophs, Azospirillum and Azotobacter. However, the vital seedling parameters such as germination percentage and vigour index were improved. Azotobacter treatment influenced maximum of 50% germination, whereas Azospirillum and Azotobacter were on par with C. roseus with respect to their vigour index. There was significant difference in the population of total diazotrophs. Azospirillum and Azotobacter between rhizosphere and non-rhizosphere soils of C. roseus had the same trend and were observed at various locations of the study. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POX) and catalase (CAT) were increased to a significant extent due to the treatment with diazotrophs.
