Main-sequence relation for galaxies in the Virgo cluster coded according to their HI gas content: filled dots show HI gas-rich objects (HI-def ≤ 0.4), and empty circles represent HI-deficient objects (HI-def ≤ 0.4). Large solid blue and empty red circles are the mean values and standard deviations for HI-normal and HI-deficient objects. Star formation rates were derived assuming stationary conditions. The Y-axis on the right side gives the corresponding Hα luminosities corrected for dust attenuation. The solid black line is the best fit; obtained for gas-rich star-forming systems. The best fit is compared to those derived for bright galaxies with HI-def ≤ 0.4 included in the HRS (Boselli et al. 2015, bisector fit) and Speagle et al. (2014, derived extrapolating the time-dependent best-fit relation to z = 0), for the SDSS sample of Peng et al. (2010) derived for galaxies with M_star ≥ 10^8.5 M_⊙, for the local sample of Vilella-Rojo et al. (2021), and for the low surface brightness sample of McGaugh et al. (2017). The typical uncertainty on the data is shown in the lower left corner.