School of Life Sciences, Devi Ahilya University, Indore, India.
School of Life Sciences, Devi Ahilya University, Indore, India; and School of Biotechnology, Devi Ahilya University, Indore, India; and Corresponding author. Email:
Funct Plant Biol. 2021 Aug;48(9):905-915. doi: 10.1071/FP21079.
The present study explored the effectiveness of SiO2 nanoparticles (NPs) as seed priming agent (15 mg L-1) to improve drought tolerance in the wheat cultivar HI 1544. Seed germination studies showed significant enhancement in the rate of seed germination, seedling growth and vigour, seed water uptake, and amylase activity in nanoprimed (NP) seeds compared with unprimed (UP) seeds. Pot experiments using wheat plants subjected to drought stress showed that SiO2 nanopriming enhanced the ability of wheat plants to withstand water deficit conditions by balancing the production of reactive oxygen species and the activity of enzymatic antioxidants like peroxidase, catalase, and superoxide dismutase. Investigations of photosynthetic parameters showed that under drought conditions, nanoprimed plants had a higher number of active reaction centres, high absorbance, trapping, and electron transport rates compared with unprimed plants. These results suggest the effects of silicon nanopriming in enhancing drought tolerance in wheat by alleviating drought induced inhibition of plant photosynthetic machinery and maintaining biochemical balance, ultimately resulting in an increase in biomass production. Results revealed the use of silicon oxide nanopriming to be a good option to increase drought tolerance in wheat plants.
本研究探讨了 SiO2 纳米粒子（NPs）作为浸种剂（15mg/L）提高小麦品种 HI 1544 耐旱性的效果。种子萌发研究表明，与未浸种（UP）种子相比，纳米浸种（NP）种子的种子萌发率、幼苗生长和活力、种子吸水量和淀粉酶活性均显著提高。利用干旱胁迫下的小麦植株进行的盆栽实验表明，SiO2 纳米浸种通过平衡活性氧的产生和过氧化物酶、过氧化氢酶和超氧化物歧化酶等酶抗氧化剂的活性，增强了小麦植株耐受水分亏缺条件的能力。对光合参数的研究表明，在干旱条件下，纳米浸种植株的活性反应中心数量较多，吸收、捕获和电子传递速率较高，与未浸种植株相比。这些结果表明，硅纳米浸种通过缓解干旱对植物光合作用机制的抑制作用并维持生化平衡，从而提高小麦的耐旱性，最终增加生物量的产生。结果表明，使用氧化硅纳米浸种是提高小麦耐旱性的一种好方法。
