4 research outputs found
Carbon sequestration and ecosystem analysis of semi-arid grazing lands at Sivagangai
Present study is focused on biomass, net primary production and system transfer functions and carbon sequestration of grazing lands in the Semi-arid regions of Sivagangai. climatic diagram was drawn based on the secondary data of Rainfall and Temperature collected from meterialogical department, Sivagangai. Study area is dominated by Heteropogon contortus at site I and Melochia corchorifolia at site II. Dry matter dynamics reflected in carbon sequestration study at site I and II. Even though above ground carbon fixation and total carbon input to the system were high at site II, Carbon output from the grazing land to soil was low due to over grazing. Monthly soil organic carbon study at site I and II also conform the low carbon output from the system to soil. Grazing land ecosystem at site I shows its stability and grazing land ecosystem at site II shows its degradation nature. Based on this study it is concluded that organic carbon is the major factor for soil nutrient bank and grazing land stability. It is very much affected at site II. Mild grazing isrecommended at site I and over grazing should be controlled at site II to maintain productive grazing lands at site I and II of semi-arid grazing lands at Sivagangai
Genetic variability among _Coleus sp_ studied by RAPD banding pattern analysis
Genetic improvement of the medicinal plants depends upon the existence, nature and extent of the genetic variability available for manipulation. Genetic analysis with RAPD markers has been extensively used to determine genetic diversity among _Coleus sp_ and to identify the best quality for human consumption for its medicinal purpose. The objectives of the present study were to assess molecular variation among _C.amboinicus_, _C.aromaticus_ and _C.forskohlii_. and to determine the level of genetic similarity among them. We performed random amplification of polymorphic DNA (RAPD) analysis on three strains of _Coleus sp_. Random primers were used for the PCR. Electrophoresis on denaturing acrylamide gels improved RAPD reproducibility and increased the band number. The primer OPW 6 and OPW 7 gave reproducible results and the band profiles