Well, Asia's pretty big ... Chinese music is different than Indian or Arabic...are you looking for anything more specific?
A lot of world music evolved without a bass tradition, so it has no "typical" bass lines. Modernized world music from such cultures tends to draw the bass rhythms from the traditional percussion rhythms, while keeping the supporting notes rather basic roots and fifths ect.
For typical scales of various Asian cultures, try wikipedia.
http://en.wikipedia.org/wiki/Pentatonic_scale is a good start