Nanotubes (NTs) penetrate plant cells and trigger plant growth. Recent research has shown that carbon NTs (CNTs) play an important factor in mitigating the oxidative stress and strengthening plant growth. In the present study, the effect of pearl millet seed priming with CNTs was evaluated based on seed germination, photosynthetic pigmentation, proline concentration, and Indole acetic acid (IAA) content of Pennisetum glaucum (pearl millet) during the seedling stage was investigated in this work. Different concentrations of NT’s were used, including 30, 60, 90, 120, and 150 parts per million (ppm). In seed germination, 90 ppm multi-walled carbon nanotubes (MWCNTs) resulted in 80% germination. The substantial enhancements in the seedlings shoot and root length, fresh weight, and dry weight were seen at 90 ppm. With increasing MWCNTs treatment, the proline concentration continually increased. MWCNTs 90 ppm treatment decreased the quantity of malondialdehyde. At 90 ppm, the total chlorophyll content in seedling leaves was 27.74 mg/g fresh weight, which was greater than the other treatment levels. When compared to the control, the IAA concentration in the seedlings increased to 37 μg/g at 150 ppm, up from 21.5 μg/g. In conclusion, the results demonstrated that MWCNTs can promote plant growth and plant growth-promoting features to a certain extent. It may trigger special metabolic activities. As a consequence, employing CNTs as nano-fertilizers in agriculture to increase plant development may be preferable along with chemical fertilizers. However, a more in-depth examination of the mechanism of action of CNTs through seed priming is suggested, possibly using omics sciences.
Key words: Multi-walled carbon nanotubes, Pennisetum glaucum, Seed germination, proline concentration, IAA contents, Nano-fertilizers
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