2012 ©
             Publication
Journal Publication
Title of Article Synthesis and characterization of silica nanoparticles from rice husk and their effects on physiology of rice under salt stress 
Date of Acceptance 13 April 2022 
Journal
     Title of Journal Chilean Journal of Agricultural Research 
     Standard SCOPUS 
     Institute of Journal the Instituto de Investigaciones Agropecuarias (INIA), Ministerio de Agricultura, Chile 
     ISBN/ISSN  
     Volume 2022 
     Issue
     Month July-September
     Year of Publication 2022 
     Page  
     Abstract Silica nanoparticles (SNPs) were synthesized from rice husk by heating at 900 oC for 7 h, the calcined powder was treated with NaOH to form sodium silicate which were treated with H2SO4 to precipitate silica. The prepared SNPs powders were agglomerated semi-spherical nano-sized particles with diameters in the range of 60–135 nm. Three rice cultivars namely ‘Pokkali’, ‘KDML105’ and ‘IR29’ were grown for 30 d in plastic pots, and then divided into 4 groups i.e., control, SNPs, NaCl and NaCl + SNPs. Foliar spray of 120 mg L-1 SNPs was given to the SNPs and NaCl + SNPs groups for 4 d. After that the plants in the NaCl and the NaCl + SNPs groups were exposed to 150 mM NaCl for 17 d. The salt-stressed plants suffered from significant reductions in biomass, net photosynthesis rate (PN), and maximal quantum efficiency of PSII photochemistry (Fv/Fm) while three stress indicators (malondialdehyde, H2O2 and proline) considerably increased. The SNPs mitigated the adverse effects of salt stress by increasing the PN and Fv/Fm and lowering H2O2 and proline contents. The H2O2 content was regulated by the increased activities of antioxidant enzymes, notably catalase (CAT), peroxidase (POX) and ascorbate peroxidase (APX). The benefit of SNPs in alleviating the stress were more prominent in the salt-sensitive cultivars ('KDML105’ and ‘IR29’) than the salt-tolerant genotype (‘Pokkali’). The application method and concentrations of SNPs used for rice plants under stress should be further optimized for the highest benefit of growth and yield in the field conditions.  
     Keyword antioxidant enzymes; net photosynthesis rate; rice; salt stress; silica nanoparticles 
Author
587020061-0 Miss PREEYANUCH LAKHUNTHOD [Main Author]
Science Doctoral Degree

Reviewing Status มีผู้ประเมินอิสระ 
Status ได้รับการตอบรับให้ตีพิมพ์ 
Level of Publication นานาชาติ 
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Part of thesis true 
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