Abstract
Seed priming is a physiological seed enhancement method. Hydro- or osmotic priming can advance germination under adequate moisture conditions. During direct seeding on well-drained paddy and upland fields, rice seeds occasionally encounter low soil moisture conditions. Under these conditions, rice seeds need to undergo rapid germination and secure emergence through improved water absorption capacity and seed bioactive. This study aims to clarify the effects of seed hydropriming on germination and seedling vigor in rice under different soil moisture conditions. The study employed three hydration conditions such as priming, soaking, and control. The seeds to be primed and soaked were submerged in tap water at 30℃ for 12 h. For priming, the seeds were subsequently dried to attain their initial seed weight, but the seeds for soaking were not dried before sowing, and the control seeds were untreated. In addition, different soil moisture conditions, such as 3%, 6%, 8%, 11%, 15%, and 20%, were set. Therefore, emergence time shortened with seed priming at 3%-11% soil moisture contents. In particular, at 8% soil moisture content, priming and soaking decreased emergence time by 26.8 h and 21.7 h, respectively compared with that of the control. At 8%-15% soil moisture contents, shoot elongation rate obtained with the priming seeds increased >1.2 times compared with that obtained with the control and soaking seeds. At >8% soil moisture content, shoot dry weight obtained with the priming seeds increased >1.3 times compared with that obtained with the soaking seeds. Furthermore, at declining soil moisture conditions, the increase in root dry weight is promoted by seed priming compared with that in the control seeds. These results suggest that increased root growth affects plant water absorption under low soil moisture conditions due to priming. This study demonstrates that seed priming facilitates rapid emergence and seedling vigor, unless extremely dry or flooded soil moisture conditions are present at seeding.
Highlights
Seed priming, which is called seed hardening, is a physiological seed enhancement method [1]
This study aims to clarify the effects of seed hydropriming on germination and seedling vigor in rice under different soil moisture conditions
This study aims to clarify the effect of seed priming on emergence and seedling vigor of rice under different soil moisture conditions
Summary
Seed priming, which is called seed hardening, is a physiological seed enhancement method [1]. Heydecker (1973) defined seed priming as a presowing treatment in which seeds are soaked in an osmotic solution that allows them to imbibe water and go through the first stages of germination, but does not permit radicle protrusion through the seed coat [2]. The seeds can be dried to attain their original moisture content and stored or planted using conventional techniques. Seed priming is a hydration treatment that allows controlled imbibition and induction of pregerminative metabolism [3,4]. Several different priming methods have been commercially used, such as water or osmotic treatment using aqueous solutions, e.g., KCl and CaCl2, and priming and solid matrix priming, which appear to have the greatest effect on seed and seedling vigor in some crops [5,6]. Seed priming is a very efficient technique to increase the speed of germination without compromising on germination rates and in some plant species, the seeds obtained with priming emerge from the soil faster and often more uniformly than non-
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