BIONATURE

The performance of a particular genotype depends on environmental interactions. Estimation of phenotypic stability, which involves regression analysis, has proved to be a valuable technique for assessing the response of various genotypes under varying environmental conditions. Low magnitude of genotype x environmental (G X E) interaction indicates consistent performance of a population over variable environments. The stability analysis of Poplar (Populus deltoides) was done taking the parameter plant height because the height of one year old nursery plants which are called entire transplants (ETPs) is considered most important character for selection and field plantation. The linear regression could simply be regarded as a measure of response of a particular genotype, whereas the deviation around the regression line is the most suitable measure of stability. So, the regression co-efficient (Bi value) and co-efficient of determination (R² value) were calculated and the stability analysis was performed. It was necessary to assess the suitability of poplar in the new alluvial soil and agro-climatic regions of West Bengal for selection of better clones. So, the present experiment was performed with 40 clones of Populus deltoides.