PRIMING OF GUAVA SEEDS
Priming is a technique used to improve seed performance. In many cases, priming allows an increase in germination uniformity and speed. One characteristic of guava seeds (Psidium guajava) is their slow germination, which takes approximately 16 d to begin and 25 d to complete. Despite the recent advances in the use of priming, little is known about its effect on guava seeds. The goal of this research was to evaluate the priming efficiency in guava seeds. Seeds were primed in water for 48h and in the osmotic potential -0.8 MPa (obtained by using PEG 8000 solution) for 120 and 336h. All of the priming treatments had the same moisture content (22%). After priming, part of the seeds was dried to the initial moisture content (8.4%). Thus, the experiment consisted of non-primed seeds (control); seeds primed in water for 48h, submitted or not to drying; seeds primed in PEG for 120 and 336h, submitted or not to drying. Eight replicates of 25 seeds were used for each treatment. Germination percentage and speed were evaluated daily, and seedlings growth was evaluated by using the Ohio State Universitys Seed Vigor Imaging System (SVIS-OSU). The results showed that the PEG primed seeds, mainly fresh seeds primed for 336h, presented higher seedling length and higher germination percentage and speed. The benefits obtained with priming were partially reverted with seeds drying, since dried primed seeds had lower performance than fresh primed seeds. However, when compared with the control and with water primed seeds, even dried primed seeds showed higher performance. In conclusion, priming of guava seeds is efficient to increase seed performance and it can be used as a methodology to improve seedling production.
Brancalion, P.H.S., Novembre, A.D.L.C., Rodrigues, R.R. and Tay, D. (2008). PRIMING OF GUAVA SEEDS. Acta Hortic. 771, 55-59
Psidium guajava, priming, polyethylene glycol, SVIS, vigor