1. Sources of silicon and nano-silicon in soil and plants 2. Silicon and nano-silicon: New frontiers of biostimulants for plant growth and stress amelioration 3. Silicon uptake, acquisition and accumulation in plants 4. Silicon bioavailability in relation to plant nutrition 5. Use of silicon and nano-silicon in agro-biotechnologies 6. The genetics of silicon accumulation by plants 7. Silicon-mediated modulations of genes and secondary metabolites in plants 8. Silicon-mediated salt stress tolerance in plants 9. Nano-silicon mediated salt stress tolerance in plants 10. Silicon and nano-silicon mediated drought and waterlogging stress tolerance in plants 11. Silicon and nano-silicon mediated heat stress tolerance in plants 12. Silicon and nano-silicon mediated cold stress tolerance in plants 13. Silicon and nano-silicon mediated heavy metal stress tolerance in plants 14. Silicon and nano-silicon mediated disease resistance in crop plants 15. Silicon and nano-silicon mediated nutrient deficiency tolerance in crop plants 16. Silicon as a plant defence against insect herbivory 17. Recent developments in nano-silicon mediated tolerance against herbivores 18. Interactive effects of silicon, nano-silicon and arbuscular mycorrhiza on the resistance of plants to various stresses 19. Biodissolution of silica by silicate solubilizing microorganisms in rhizosphere of plants 20. Silicon and nano-silicon in plant nutrition and crop quality 21. Effect of silicon and nano-silicon application on rice yield and quality 22. Biological impacts on silicon availability and cycling in agricultural plant-soil systems 23. Exogenous silicone-mediated plant growth and environmental stress tolerance in plants 24. Manipulation of silicon metabolism in plants for stress tolerance 25. Future research direction of silicon and nano-silicon in crop stress tolerance and crop quality improvements