Choi Ju-Young, Ju Young-Hwan, Nakamichi Ayaka, Cho Seong-Woo, Woo Sun-Hee, Sakagami Jun-Ichi
The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0065, Japan.
Graduate School of Agriculture, Forestry and Fisheries, Kagoshima University, Kagoshima 890-0065, Japan.
Plants (Basel). 2024 Dec 18;13(24):3537. doi: 10.3390/plants13243537.
Hydropriming rice seeds effectively improve the germination percentage, shortens the germination period, and promotes seedling growth. The impact of seed hydropriming is to speed up growth under dry soil conditions, thereby avoiding drought damage. This study analyzes the effect of hydropriming on morpho-physiological changes in the water uptake of rice seeds using "Kasalath" and "Nipponbare" under water-deficit conditions. Upon exposure to osmotic stress, both varieties showed delays in the time to reach germination. In addition, all germination phases exhibited reductions in the activity of alpha-amylase and total soluble sugar by osmotic stress; however, in all germination phases of the hydroprimed seeds, the activity and contents of those were significantly increased, resulting in increased size of the coleoptile, plumule, and radicle. In hydroprimed seeds, "Kasalath" was superior to "Nipponbare" in the ratio of the water-deficit-to-well-watered conditions for all traits related to germination, which may have been attributable to hydropriming having a greater effect on "Kasalath". Interestingly, Primed "Kasalath" had a lower level of α-amylase, despite the having a higher content of total soluble sugars than primed "Nipponbare".
水引发水稻种子可有效提高发芽率，缩短发芽期，并促进幼苗生长。种子水引发的作用是在干旱土壤条件下加速生长，从而避免干旱损害。本研究分析了在水分亏缺条件下，水引发对 “Kasalath” 和 “日本晴” 水稻种子水分吸收的形态生理变化的影响。在渗透胁迫下，两个品种达到发芽的时间均出现延迟。此外，在渗透胁迫下，所有发芽阶段的α-淀粉酶活性和总可溶性糖含量均降低；然而，在水引发种子的所有发芽阶段，这些物质的活性和含量均显著增加，导致胚芽鞘、胚芽和胚根的尺寸增大。在水引发种子中，就与发芽相关的所有性状而言，“Kasalath” 在水分亏缺与充分浇水条件下的比率方面优于 “日本晴”，这可能归因于水引发对 “Kasalath” 的影响更大。有趣的是，引发的 “Kasalath” 的α-淀粉酶水平较低，尽管其总可溶性糖含量高于引发的 “日本晴”。
