Abstract

                                Thirty six hybrids along with their thirteen parents were raised in three different salt affected environments of Tamilnadu and Pondichery. Per cent standard heterosis was worked out keeping CORH2 as standard parent for nine different yield and salt tolerance related traits. The pooled environment standard heterosis was taken into consideration because it is the collective response of hybrids in various environments. Based on per se, sca and standard heterosis, hybrid TS 29/BTS 24 was found good because, it recorded high mean values for all the traits taken for study except 100 grain weight and also had high standard heterosis percentage for days to 50 per cent flowering, productive tillers plant', leaf proline content, Na : K ratio, chlorophyll stability index and grain yield m along with high sea effect for leaf proline content, productive tillers plant and grain yield m². In addition, hybrids TS 29/Jaya, TS 6/Pokkali and IR 58025 A/Vytilla 1 were also recorded high mean, sca effect and standard heterosis value mainly for grain yield m¹ and for the traits related salt tolerant mechanism such as leaf proline content, chlorophyll stability index, Na": K ratio and found suitable to salt affected soils.

Key words : environment, heterosis, rice hybrids, salt tolerance