Author:
Hasanaklou Nasibeh Tavakoli,Mohagheghi Vahid,Hasanaklou Hourieh Tavakoli,Ma’mani Leila,Malekmohammadi Marjan,Moradi Foad,Dalvand Yadollah
Abstract
Abstract
Background
This study aimed to assess the effects of different concentrations of silicon (Si) nutrient sources, including bulk silicon dioxide (bSiO2) and two types of silica nanoparticles, nSiO2 (I) and nSiO2 (II) at different concentrations of 1, 5, 10, 25, 50, and 100 ppm in the germination process of stevia. The priming experiment was conducted using a completely randomized design with three replicates to ensure the reliability of the results.
Results
All stevia seedlings subjected to nano-priming significantly improved the germination parameters. The germination percentage increased by 106%, reaching 68% in nano-primed seedlings. Similarly, the germination rate showed a remarkable increase of 128.12% at 7.3 day−1. Additionally, the root, shoot, and seedling dry weight increased by 283%, 168.9%, and 220% and determined 0.092, 0.078, and 0.17 g plant−1, respectively, compared to the control. Furthermore, seed priming with nSiO2 (I) at a concentration of 10 ppm resulted in an increased catalase (CAT) activity (36.15 Umg−1 protein) and peroxidase (POX) activity (approximately 0.057 U.mg−1 protein). Also, the highest sucrose amount was observed in the root (equal to 160.4 μg g−1 DW) and shoot (equal to 247 μg g−1 DW) of seedlings primed with 10 ppm of nSiO2 (I). However, it should be noted that nano-priming at the highest concentration led to oxidative damage indicated by an increase in H2O2 concentration. Conversely, bSiO2 demonstrated a lesser effect on improving germination, seedling growth, antioxidant activities, and biochemical attributes compared to nSiO2 (I), and nSiO2 (II).
Conclusions
This study established that seed priming with nSiO2 (I) at a concentration of 10 ppm was the most effective in enhancing germination percentage and rate, root/shoot/dry weight, biochemical attributes, and enzyme activities (such as α-amylase, CAT, and POX). The results suggested that seed priming with nSiO2 (I) at the optimal concentration could improve the seed germination by enhancing the antioxidant system, starch metabolism, and ultimately protecting plants from oxidative damage.
Graphical Abstract
Publisher
Springer Science and Business Media LLC
Subject
Agronomy and Crop Science,Biochemistry,Food Science,Biotechnology
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