Researchers analyzed the combining ability of different rice varieties to improve grain yield and other traits. They crossed three male sterile lines with twelve restorer lines to create 36 hybrids. The study focused on traits like flowering time, plant height, tiller number, grain weight, and yield. One male sterile line, IR-58025 A, showed good combining ability for most traits, suggesting it can be useful in breeding programs. Restorer lines IR61614, HR1005, RPHR51, and RPHR612 also showed promise as good combiners. Specific hybrid combinations like IR-58025 A x IR66 were identified as particularly successful.