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We considered two sequences of spiral galaxies with different shapes of theradial gas-phase oxygen abundance distributions from the galaxies in the MaNGAsurvey: (1) Galaxies in which the gradient is well approximated by a singlelinear relation across the whole disc, that is, galaxies with an S (slope)gradients, (2) galaxies in which the metallicity in the inner region of thedisc is at a nearly constant level and the gradient is negative at largerradii, that is, galaxies with level-slope (LS) gradients. We also selectedgalaxies with a nearly uniform oxygen abundance across the whole galaxy, thatis, galaxies with level (L) gradients that can be the final evolutionary stageof the two galaxy sequences described above. The radial nitrogen abundancedistributions in galaxies with LS oxygen abundance distributions also showbreaks at radii smaller than the O/H distribution breaks. The observedbehaviour of the oxygen and nitrogen abundances with radius in these galaxiescan be explained by the time delay between the nitrogen and oxygen enrichmenttogether with the variation in the star formation history along the radius.These galaxies clearly show the effect of the inside-out disc evolution model.We find that the shape of the radial abundance distribution in a galaxy is notrelated to its macroscopic characteristics (rotation velocity, stellar mass,isophotal radius, and star formation rate). The correlations between thegradient slopes and macroscopic characteristics of galaxies are weak in thesense that the scatter of the points in each diagram is large. We also examinedthe properties of the Milky Way in the context of the considered galaxysamples.

Two sequences of spiral galaxies with different shapes of the metallicity gradients