  We examine whether there are deviations of the local central oxygen
abundances in spiral galaxies from the general metallicity gradients. We
compare the values of the central intersect oxygen abundances estimated from
the metallicity gradient based on the integral field unit (IFU) spectroscopy
from the Mapping Nearby Galaxies at the Apache Point Observatory (MaNGA) survey
and the local central oxygen abundances obtained from the single-fibre
observations from the Sloan Digital Sky Survey (SDSS). Special attention is
placed on galaxies with recent and currently ongoing central starbursts (cSB
galaxies). We selected a sample of 30 cSB galaxies from our total sample of 381
MaNGA galaxies, using the decrease in the Dn4000 index (a stellar age
indicator) in the circumnuclear region as the selection criterion. We found
that the local central oxygen abundances follow the general metallicity
gradients in the galaxies well and agree with the central intersect abundances
within uncertainties of the central abundances determinations. Starbursts in
the centres of cSB galaxies do not produce noticeable oxygen enrichments. The
central starbursts imply that an appreciable amount of gas is present at the
centres of cSB galaxies. The gas at the centre of galaxy can serve not only as
a raw material for the star formation, but also as a fuel for the activity of
the galactic nucleus (AGN). We found that the AGN is the main source of the
ionising radiation at the centres of six cSB galaxies in our sample.
