Hi Ravi,

Blast tree is a simple pairwise alignment based tree created by NCBI BLAST automatically. While the phylogeny tree is a true tree depicting the multiple alignment between all gene/protein sets. It (BLAST tree) is a vague attempt to display the relationship between the BLAST hits. You cannot use it in any publications. A true phylogeny tree will show you the correct interpretation of the evolution of particular gene/protein.

thank u guarav