Spin-priming - A novel and a crucial treatment to enhance the seed quality of roselle (Hibiscus sabdariffa) seeds

Seed vigour being an important physiological parameter is important indeed in medicinal plant like roselle in which it is increased significantly by standardization of conventional priming (hydro-priming) duration and spin-priming duration of (Hibiscus sabdariffa) then compared with the non - primed seeds. The standardisation of hydropriming was performed by soaking of seeds in equal volume of water for various soaking durations viz., 2-5 h and restored to its initial state of moistness revealed that hydropriming of roselle seeds for 5 h registered higher physiological seed quality parameters. The best performed hydropriming duration of 5 h was taken for standardisation of spin - drying duration by adopting several drying timings viz., 1-5 min. The results indicated that the seeds hydro-primed (5 h) and spin-dried for 4 min had a significant improvement in physiological parameters, seed anatomical structure namely length (8.4 cm) and width (2.33 cm) of the embryo and root growth was seen evident through root architecture analysis. The % increase in germination over control in hydro-priming and spin-drying for 5 h and 4 min was 51 and the expresses the maximum vigour index of 1612.