Multi-walled carbon nanotubes prevent high temperature-induced damage by activating the ascorbate-glutathione cycle in Paeonia ostii T. Hong et J. X. Zhang

Multi-walled carbon nanotubes wrapped with polyvinylpyrrolidone can control the leaf yellowing of Alstroemeria cut flowers

“…Photosynthesis requires the chloroplast structure to be stable 52 . One possible explanation for this observed effect could be that MWCNTs are capable of penetrating the chloroplast, exhibiting the MWCNTs' ability to stabilize the chloroplast structure 53 .…”

“…Similarly, Ren et al 69 found that single-wall carbon nanotubes increased antioxidant system activity while lowering MDA levels. Zhao et al 53 demonstrated that exogenous MWCNTs maintain a low level of reactive oxygen species (ROS) and regulate the expression and activity of enzymes involved in the ASA-GSH cycle 53 , increased antioxidant activity by removing reactive oxygen species, resulting in increased protein stability, decreased lipid peroxidation, increased membrane integrity, and improved plant quality 69 , 70 .…”

Postsynthetic Modification of Ti-Based Metal–Organic Frameworks with Polyamines and Its Behavior on Biochemical Constituents of Sesamum indicum L. under Heat Stress Conditions

“…58 On the other hand, the other nanmaterials can protect the photosynthetic organs from damage, thus maintaining the net photosynthesis rate, stomata conduction, intercellular CO 2 concentration, and transpiration rate in the photosystem. 54 Moreover, the nanomaterial also reduced the stomatal limitation. 59 Additionally, the nanomaterial caused an increase in variable fluorescence from dark-adapted leaf/maximum fluorescence from dark-adapted leaf and actual photosynthetic efficiency of photosystem II (PSII), together with the decrease in the nonphotochemical quenching coefficient and quantum yield of nonregulated energy dissipation, and subsequently increased the chlorophyll content in plants.…”

“…53 The improvement in photosynthetic pigments after spraying nanomaterials was compared with previous works. 54 Nanoparticles, such as TiO 2 , and MOF-P, enhanced the activities of carbonic anhydrase and nitrate reductase enzymes that affect the chlorophyll content of the plant. 55 TiO 2 NPs exhibited the complementary effect on other inherent nutrients like magnesium, iron, and sulfur.…”

“…66 Likewise, nanomaterials played a major role in the modification of key enzyme activities in the POD cycle at elevated temperatures, allowing for greater resilience injury caused by the temperature. 54 Furthermore, the pore size of MOFs played an important role in activating the biosynthesis of enzymes (SOD and POD), especially when the overproduction of free radicals was increased, which is reflected in the increase in the activity of antioxidant enzymes. More recently, polyamines can modify the antioxidant system to reestablish the cellular redox balance and homeostasis, 79 polyamines play an important role in changes in gene expression, those responsible for the expression of osmoprotectants, detoxifying enzymes, transporters, and regulatory proteins.…”