Evaluation of A1, A2, A3, A4(M), A4(G) and A4(VZM) cytoplasms in iso-nuclear backgrounds for grain mold resistance

► Effect of six CMS systems on grain mold resistance is studied in iso-nuclear hybrids. ► The A1 cytoplasm is best suited for the development of sorghum hybrids with grain mold resistance. ► The A2 and A4(VZM) cytoplasms can be exploited without increasing the risk of grain mold. ► The A4(M) cytoplasm contributed to superior GCA effects while the A1 and A4(VZM) contributed to superior SCA effects. ► Significant heterosis is reported on all CMS systems based hybrids.