Iqbal Shahid, Hussain Mujahid, Sadiq Saleha, Seleiman Mahmoud F, Sarkhosh Ali, Chater John M, Shahid Muhammad Adnan
Horticultural Science Department, North Florida Research and Education Center, University of Florida/IFAS, Quincy, FL, 32351, USA.
Department of Horticulture, Faculty of Agricultural Sciences, University of the Punjab, Lahore, 54590, Pakistan.
Heliyon. 2023 Nov 29;10(1):e22960. doi: 10.1016/j.heliyon.2023.e22960. eCollection 2024 Jan 15.
Citrus is a remarkable fruit crop, extremely sensitive to flooding conditions, which frequently trigger hypoxia stress and cause severe damage to citrus plants. Silicon nanoparticles (SiNPs) are beneficial and have the potential to overcome this problem. Therefore, the present study aimed to investigate the effect of silicon nanoparticles to overcome hypoxia stress through modulating antioxidant enzyme activity and carbohydrate metabolism. Three citrus rootstocks (Carrizo citrange, Roubidoux, and Rich 16-6) were exposed to flooding (with and without oxygen) through different SiNP treatments via foliar and root zone. SiNPs applied treatment plants showed a significant increase in photosynthesis, leaf greenness, antioxidant enzymes, and carbohydrate metabolic activities, besides the higher accumulation of proline and glycine betaine. The rate of lipid peroxidation was drastically higher in flooded plants; however, SiNPs application reduced it significantly, ultimately reducing oxidative damage. Overall, Rich16-6 rootstock showed good performance via root zone application compared to other rootstocks, possibly due to genotypical variation in silicon uptake. Our outcomes demonstrate that SiNPs significantly affect plant growth during hypoxia stress conditions, and their use is an optimal strategy to overcome this issue. This study laid the foundation for future research to use at the commercial level to overcome hypoxia stress and a potential platform for future research.
柑橘是一种重要的水果作物，对洪涝条件极为敏感，洪涝常常引发缺氧胁迫并对柑橘植株造成严重损害。硅纳米颗粒（SiNPs）有益且有潜力克服这一问题。因此，本研究旨在探究硅纳米颗粒通过调节抗氧化酶活性和碳水化合物代谢来克服缺氧胁迫的效果。通过叶面和根区的不同SiNP处理，使三种柑橘砧木（卡里佐枳橙、鲁比杜斯和里奇16 - 6）遭受洪涝（有氧和无氧）处理。施用SiNPs的处理植株除脯氨酸和甘氨酸甜菜碱积累量更高外，光合作用、叶片绿度、抗氧化酶和碳水化合物代谢活性均显著增加。淹水植株的脂质过氧化速率大幅更高；然而，施用SiNPs显著降低了该速率，最终减少了氧化损伤。总体而言，与其他砧木相比，里奇16 - 6砧木通过根区施用表现出良好性能，这可能是由于硅吸收的基因型差异。我们的结果表明，SiNPs在缺氧胁迫条件下显著影响植物生长，其使用是克服这一问题的最佳策略。本研究为未来在商业层面利用其克服缺氧胁迫的研究奠定了基础，也是未来研究的一个潜在平台。
