Synchronization of flowering between parental lines assumes much greater significance to ensure higher yields in seed production plots. Due to genotype x environment interaction, duration in 50 per cent flowering of the parental lines differ over locations/planting times. The present study determines the seeding sequences of parental lines of CMS based hybrid Pant Sankar Dhan 3 for multiplication of A, female parent (A/B) and hybrid (A/R) under three planting dates using three methods of synchronization viz, differences in growth duration (GD), leaf number (LN) and effective accumulated temperature (EAT) of the lines involved. ANOVA revealed significant mean squares for genotypes and sowing dates for all the lines and genotypes × sowing date interaction is significant only in respect of EAT. Result indicated that in (GD) method, B and R lines flowered earlier on an average of three planting dates by 4 and 3 days with respect to corresponding seed parent. Respective values of EAT in respect of flowering of A, B and R lines are 1477.53, 1397.13 and 1421.66ºC and leaf numbers 16.50, 14.96 and 15.30. For synchronization, seeding of B and R lines is suggested when the A line attains LN of 1.54 and 1.20, respectively for A/B and A/R production. Study also revealed greater consistency in flowering days in CMS line with LN method, as compared to other two methods. It suggests LN method to be more reliable across planting dates followed by EAT and GD to predict synchronization between parental lines of hybrids
Key words: Hybrid rice, Synchronization, Growth duration, Leaf number, EAT
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