Document Type : Research Paper

Authors

1 Research Assist. Prof., Dept. of Seed Improvement, Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran

2 Rice Research Institute of Iran, Rasht

3 Rice Research Institute of Iran

Abstract

In order to investigate the effect of seed priming (Pretreatment) and coating on seedling characteristics, root morphology and phenological stages of rice, a two-year experiment was conducted in the Rice Research Institute of Iran (Rasht) in two years 2020 and 2021. The experiment was performed as a factorial in a randomized complete block design with three replications. Experimental factors included two rice cultivars (Hashemi and Gohar) and the seed pretreatment of rice cultivars in seven levels including 1- Priming with calcium chloride (-1.25 MPa in 24 hours), 2- Priming with potassium chloride (1.25 MPa in 24 hours), 3- Priming with zinc sulfate (concentration of 0.5 mM in 12 hours), 4- Hydropriming (48 hours) + Coating the seeds with calcium chloride, 5- Hydro-priming (48 hours) + Coating With potassium chloride, 6- hydropriming (48 hours) + coating with zinc sulfate and 7- hydropriming (48 hours as control). The results showed that the highest percentage and germination rate was observed with 99.5% and 0.23 seeds per day under seed priming with potassium chloride in the Gohar cultivar, respectively. The least time required of days to achieve 90% emergence was obtained Hasehmi and Gohar cultivars studied by priming with potassium chloride and calcium chloride. The highest root length with 24.6 cm was observed in priming with potassium chloride in the Gohar cultivar. The highest root dry weight in Hashemi and the Gohar cultivars was 2.14 and 4.9 g, respectively, in priming with potassium chloride.

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