  We have studied electromagnetic line emissions from near-horizon region in
the extremal Kerr-Taub-NUT black hole spacetime and then probe the effects of
NUT charge on the electromagnetic line emissions. Due to the presence of the
NUT charge, the equatorial plane is no more a symmetry plane of the KTN
spacetime, which leads to that the dependence of electromagnetic line emission
on the NUT charge for the observer in the Southern Hemisphere differs from that
in the Northern one. Our result indicate that the electromagnetic line emission
in the Kerr-Taub-NUT black hole case is brighter than that in the case of Kerr
black hole for the observer in the equatorial plane or in the Southern
Hemisphere, but it becomes more faint as the observer's position deviates far
from the equatorial plane in the Northern one. Moreover, we also probe effects
of redshift factor on electromagnetic emission from near-horizon region in the
extremal Kerr-Taub-NUT black hole spacetime.
