Somoclonal variation vs gametoclonal variation

Gametoclonal variation has been defined as the variation among plants regenerated from gametic cells in culture (Evans et al., 1984; Morrison and Evans, 1987). ... Attempts can be made to direct gametoclonal variation by imposition of selection agents during the process of haploid derivation. 

Somaclonal variation is defined as genetic variation observed among progeny of plants regenerated from somatic cells cultured in vitro. Although theoretically all plants regenerated from somatic cells should be clones, a number of observations have indicated that this is not the case.

Somaclonal variations are reported in all types of plant tissue cultures. In recent years, the term gametoclonal variations is used for the variations observed in the regenerated plants from gametic cells (e.g., anther cultures).