Abstract
Salt stress is one of the key factors that limits the cultivation of Glycyrrhiza uralensis Fisch. (G. uralensis) in the northern part of China. In this study, three salt treatments (including 21, 42 and 63 ds/m NaCl/kg dry soil) and four Si (silicon) concentrations (including 0, 1.4, 2.8 and 4.2 ds/m SiO2/kg K2SiO3 in dry soil) were tested using G. uralensis as the plant material in a pot experiment with three replications. The results showed that the application of various concentrations of Si increased sucrose synthetase (SS), sucrose phosphate synthetase (SPS) and glutamine synthetase (GS), as well as nitrate reductase (NR) activities, and promoted carbon and nitrogen metabolism. Si application also increased the root dry weight of G. uralensis. Multilevel comparative analysis showed that the application of 2.8 ds/m SiO2 was the optimum rate for improved growth and yield of G. uralensis under different salt levels. This study provides important information that can form the basis for the cultivation of high-yielding and high-quality G. uralensis in saline soils.
Highlights
Abbreviations Si Silicon sucrose phosphate synthetase (SPS) Sucrose phosphate synthetase SS Sucrose synthetase nitrate reductase (NR) Nitrate reductase glutamine synthetase (GS) Glutamine synthetase
The activities of SS and SPS in G. uralensis leaves were significantly decreased after NaCl was added compared to those in plants grown with N a1 (CK)
Si regulates C and N metabolism and alters physiological activities, in plants subjected to NaCl stress conditions, which could alleviate adverse effects induced by salt stress on G. uralensis
Summary
Abbreviations Si Silicon SPS Sucrose phosphate synthetase SS Sucrose synthetase NR Nitrate reductase GS Glutamine synthetase. Soil salinity has been shown to affect approximately 800 million hectares of arable land worldwide[1] It is currently receiving considerable attention in global agricultural research because of its significant threat to plant growth and development[2]. Other studies have shown that salt stress can alter a range of physiological and biochemical processes and inhibit enzyme activities of carbon (C) and nitrogen (N) m etabolism[3]. This effect has been demonstrated among crops such as Zea mays L.4, tomato5, wheat6, chickpea[7] and Ethiopian mustard[8]. Little information is available regarding the influence of Si on C and N metabolism under salt stress
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