Department of Agricultural Botany, Agricultural College and Research Institute, Madurai 625104.
* Present address: Tamil Nadu Rice Research Institute, Adhuthurai 612101.
All the five testers used in this study acted as complete restorer for WA source and maintainer for O. perennis. The hybrids IR 58025 A x IR 54742 and IR 58025 A x IR 29723 showed greater heterotic expression for all the economic traits studied. The mean outcrossing percentage was high in V 20 A and IR 58025 A among the cytosteriles. High outcrossing rate was observed in IR 58025 Awhen interplanted with IR 29723. The crosses IR 58025 A x IR 29723 and V 20 A x IR 24 can be used in hybrid rice programme since it displayed higher heterosis with high outcrossing rate.
Restoration, hybrid vigour, outcrossing potential, rice
