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Polymers 2018, 10(10), 1154; https://doi.org/10.3390/polym10101154

Effects of Calcium Alginate Submicroparticles on Seed Germination and Seedling Growth of Wheat (Triticum aestivum L.)

1,2,†
,
1,3,†
,
1
,
1
,
2,* , 1,* and 1,*
1
Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2
School of Food Science and Engineering, Dalian Ocean University, Dalian 116023, China
3
School of Environment Science and Engineering, Dalian Maritime University, Dalian 116026, China
Jinxia He and Ruixin Li contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 20 September 2018 / Revised: 5 October 2018 / Accepted: 6 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Polysaccharides)
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Abstract

Calcium alginate (CaAlg) submicroparticles have a potential application in agricultural delivery systems. This study investigated the effects of CaAlg submicroparticles on seed germination and seedling growth of wheat. CaAlg submicroparticles with a Z-average diameter of around 250.4 nm and a measured zeta potential value of about −25.4 mV were prepared and characterized by dynamic light scattering (DLS), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). After this, the effects of the concentration of CaAlg submicroparticles (10–500 μg/mL) on germination percentage, seedling length, the number of adventitious roots, chlorophyll content and soluble protein content were evaluated. The results demonstrated a significant increase in the level of germination percentage (9.0%), seedling index (50.3%), adventitious roots (27.5%), seedling length (17.0%), chlorophyll (8.7%) and soluble protein contents (4.5%) at a concentration of 100 μg/mL. However, an inhibitory effect was observed at a concentration of 500 μg/mL. The SEM examination showed that CaAlg submicroparticles could be successfully adsorbed onto the surface of the wheat seed. Further studies proved that CaAlg submicroparticles at a concentration of 100 μg/mL promoted the expression of indole-3-acetic acid (IAA)-related genes (YUCCA9, AUX1, ARF and UGT) in wheat, which resulted in an increase of 69% and 21% in IAA concentration in wheat roots and shoots, respectively. View Full-Text
Keywords: calcium alginate submicroparticles; seed germination; seedling growth; wheat calcium alginate submicroparticles; seed germination; seedling growth; wheat
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He, J.; Li, R.; Sun, X.; Wang, W.; Hu, J.; Xie, H.; Yin, H. Effects of Calcium Alginate Submicroparticles on Seed Germination and Seedling Growth of Wheat (Triticum aestivum L.). Polymers 2018, 10, 1154.

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