Abstract
Carbon nanotubes (MWCNTs) and nano-silica (nano-SiO2) are widely used in the field of life science because of their special physical and chemical properties. In this study, the effects of different concentrations of MWCNTs (0 mg·L−1, 200 mg·L−1, 400 mg·L−1, 800 mg·L−1 and 1200 mg·L−1) and nano-SiO2 (0 mg·L−1, 150 mg·L−1, 800 mg·L−1, 1500 mg·L−1 and 2500 mg·L−1) on maize seedling growth and relative mechanisms were explored. The main results are as follows: MWCNTs and nano-SiO2 can promote the growth of maize seedlings, and promote plant height, root length, the dry and fresh weight of seedlings, root–shoot ratio and so on. The ability to accumulate dry matter increased, the relative water content of leaves increased, the electrical conductivity of leaves decreased, the stability of cell membranes improved and the water metabolism ability of maize seedlings increased. The treatment of MWCNTs with 800 mg·L−1 and nano-SiO2 with 1500 mg·L−1 had the best effect on seedling growth. MWCNTs and nano-SiO2 can promote the development of root morphology, increase root length, root surface area, average diameter, root volume and total root tip number and improve root activity, so as to improve the absorption capacity of roots to water and nutrition. After MWCNT and nano-SiO2 treatment, compared with the control, the contents of O2·− and H2O2 decreased, and the damage of reactive oxygen free radicals to cells decreased. MWCNTs and nano-SiO2 can promote the clearance of reactive oxygen species and maintain the complete structure of cells, so as to slow down plant aging. The promoting effect of MWCNTs treated with 800 mg·L−1 and nano-SiO2 treated with 1500 mg·L−1 had the best effect. After treatment with MWCNTs and nano-SiO2, the activities of key photosynthesis enzymes PEPC, Rubisco, NADP-ME, NADP-MDH and PPDK of maize seedlings increased, which promoted the opening of stomata, improved the fixation efficiency of CO2, improved the photosynthetic process of maize plants and promoted plant growth. The promoting effect was the best when the concentration of MWCNTs was 800 mg·L−1 and the concentration of nano-SiO2 was 1500 mg·L−1. MWCNTs and nano-SiO2 can increase the activities of the enzymes GS, GOGAT, GAD and GDH related to nitrogen metabolism in maize leaves and roots, and can increase the content of pyruvate, so as to promote the synthesis of carbohydrates and the utilization of nitrogen and promote plant growth.
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Claims 17
Claim · model-written summary
MWCNTs promoted maize seedling growth and associated size and mass traits.
- Treatment
- MWCNTse0
- Outcome
- plant height, root length, the dry and fresh weight of seedlingse0
- Direction
- promotee0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MWCNTs and nano-SiO2 can promote the growth of maize seedlings, and promote plant height, root length, the dry and fresh weight of seedlings, root–shoot ratio and so on”
Claim · model-written summary
Nano-silica promoted maize seedling growth and associated size and mass traits.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MWCNTs and nano-SiO2 can promote the growth of maize seedlings, and promote plant height, root length, the dry and fresh weight of seedlings, root–shoot ratio and so on”
Claim · model-written summary
Dry matter accumulation and leaf relative water content increased while leaf electrical conductivity decreased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ability to accumulate dry matter increased, the relative water content of leaves increased, the electrical conductivity of leaves decreased”
t0“Maize”
Claim · model-written summary
Leaf relative water content increased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative water content of leaves increased”
t0“Maize”
Claim · model-written summary
Leaf electrical conductivity decreased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the electrical conductivity of leaves decreased”
t0“Maize”
Claim · model-written summary
Cell membrane stability and seedling water metabolism improved.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stability of cell membranes improved and the water metabolism ability of maize seedlings increased”
Claim · model-written summary
Water metabolism ability increased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the water metabolism ability of maize seedlings increased”
Claim · model-written summary
The 800 mg·L−1 MWCNT treatment had the best seedling growth effect.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of MWCNTs with 800 mg·L−1 and nano-SiO2 with 1500 mg·L−1 had the best effect on seedling growth”
t0“Maize”
Claim · model-written summary
The 1500 mg·L−1 nano-silica treatment had the best seedling growth effect.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment of MWCNTs with 800 mg·L−1 and nano-SiO2 with 1500 mg·L−1 had the best effect on seedling growth”
t0“Maize”
Claim · model-written summary
MWCNTs increased root morphology metrics and activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MWCNTs and nano-SiO2 can promote the development of root morphology, increase root length, root surface area, average diameter, root volume and total root tip number and improve root activity”
t0“Maize”
Claim · model-written summary
Nano-silica increased root morphology metrics and activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MWCNTs and nano-SiO2 can promote the development of root morphology, increase root length, root surface area, average diameter, root volume and total root tip number and improve root activity”
t0“Maize”
Claim · model-written summary
Both treatments lowered superoxide and hydrogen peroxide content relative to control.
- Treatment
- MWCNT and nano-SiO2 treatmente0
- Outcome
- contents of O2·− and H2O2e0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After MWCNT and nano-SiO2 treatment, compared with the control, the contents of O2·− and H2O2 decreased”
t0“Maize”
Claim · model-written summary
Both treatments decreased free-radical damage.
- Treatment
- MWCNT and nano-SiO2 treatmente1
- Outcome
- damage of reactive oxygen free radicals to cellse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the damage of reactive oxygen free radicals to cells decreased”
e1“MWCNT and nano-SiO2 treatment”
t0“Maize”
Claim · model-written summary
Both treatments increased key photosynthesis enzyme activities.
- Treatment
- MWCNTs and nano-SiO2e0
- Outcome
- activities of key photosynthesis enzymes PEPC, Rubisco, NADP-ME, NADP-MDH and PPDKe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After treatment with MWCNTs and nano-SiO2, the activities of key photosynthesis enzymes PEPC, Rubisco, NADP-ME, NADP-MDH and PPDK of maize seedlings increased”
Claim · model-written summary
Both treatments promoted stomatal opening and carbon fixation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which promoted the opening of stomata, improved the fixation efficiency of CO2, improved the photosynthetic process of maize plants and promoted plant growth”
Claim · model-written summary
Both treatments increased nitrogen-metabolism enzyme activities.
- Treatment
- MWCNTs and nano-SiO2e0
- Outcome
- activities of the enzymes GS, GOGAT, GAD and GDHe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MWCNTs and nano-SiO2 can increase the activities of the enzymes GS, GOGAT, GAD and GDH related to nitrogen metabolism in maize leaves and roots”
Claim · model-written summary
Both treatments increased pyruvate content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and can increase the content of pyruvate”
e1“MWCNTs and nano-SiO2 can increase the activities”
t0“Maize”
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