The short answer is yes...

The long answer is that the "root" chord could be any chord built from the D Dorian scale.

Dorian is 1 2 b3 4 5 6 b7, so you could use

D5 (1 5)

Dm (1 b3 5)

Dsus2 (1 2 5)

Dsus4 (1 4 5)

Dm6 (1 b3 5 6)

Dm6/9 (1 b3 5 6 9)

Dmadd9 (1 b3 5 9)

Dm7 (1 b3 5 b7)

D7sus (1 4 5 b7)

Dm9 (1 b3 5 b7 9)

Dm11 (1 b3 5 b7 9 11)

Dm13 (1 b3 5 b7 9 11 13) etc...

You could also make up a riff out of the scale that resolves to the D note... you don't have to use chords.

yes the D chord would be a minor seventh chord. all of the chord qualities will be the same in the dorian as they were in the parent scale.

how do you know you want to write with a dorian sound, if you are hazy on what the dorian sound is?

JC