Physiological and molecular level understanding of advanced carbon dots to enhance maize drought tolerance: modulation of photosynthesis and signaling molecules

Wang, Chuanxi; Yang, Huichao; Yue, Le; Sun, Wei; Chen, Feiran; Cao, Xuesong; Zhao, Xiaoli; Wu, Fengchang; Wang, Zhenyu; Xing, Baoshan

doi:10.1039/d2en00176d

Cited by 17 publications

(23 citation statements)

References 52 publications

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“…Therefore, we propose that N-CDs could increase crop photosynthesis in drought through light harvesting, photoprotection (PP) (ROS scavenging), and light repairing (upregulated expression of psbA and fast synthesis of the D1 protein). Recent studies demonstrated that CDs and N-CDs could promote the growth of tomatoes, maize, and soybeans under drought stress by modulating rhizospheric properties, nutrient bioavailability, photosynthesis, and phytohormones. − However, the mechanism of promoted photosynthesis and whether N-CDs could increase crop yield in drought are still unknown. Thus, the aim of this work is to investigate (1) the mechanism of promoted photosynthesis by N-CDs under drought stress, (2) the advantages of N-CDs in enhancing crop drought tolerance, and (3) the effect of crop yield by foliar-applied N-CDs under drought stress.…”

Section: Introductionmentioning

confidence: 99%

Regulation Mechanisms of Nitrogen-Doped Carbon Dots in Enhanced Maize Photosynthesis under Drought Stress

Wang

Yao

Yue

et al. 2023

ACS Agric. Sci. Technol.

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Herein, greenhouse experiments were designed to reveal the role of nitrogen-doped carbon dots (N-CDs) in enhancing maize drought tolerance. Two humidity conditions were created: adequate watering (soil moisture, 75%) and drought stress (soil moisture, 35%). Corn seedlings were harvested after spraying the N-CD solution (5 mg·L–1) on maize leaves for 5 days. The results indicated that foliar application of N-CDs increased the net photosynthesis rate (28.6%) of maize, and the fresh and dry weights of roots and shoots increased by 224.5, 360.0, 230.8, and 63.3% under drought stress, respectively. N-CDs showed high reactive oxygen species (ROS)-scavenging activity, resulting in enhanced superoxide dismutase activity (26.7%) and reduced malondialdehyde enzyme activity (18.9%). Besides, N-CDs could be used as light-harvesting materials to improve the light utilization efficiency, upregulate psbA gene expression (81.7-fold), and promote fast synthesis of the D1 protein, which could repair photosystem II under drought stress. Therefore, foliar-sprayed N-CDs could improve photosynthesis through multiple pathways under drought stress: light harvesting, photoprotection, and light repairing. Then, N-CD exposure reduced the corn yield loss under drought by nearly 30% compared with those of the control groups in a full life cycle study. Therefore, this study found for the first time that N-CD-enabled nanoagriculture could ensure crop growth and yield under drought stress, which would be important for global crop cultivation and a promising alternative to deal with the global climate change.

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Section: Introductionmentioning

confidence: 99%

Regulation Mechanisms of Nitrogen-Doped Carbon Dots in Enhanced Maize Photosynthesis under Drought Stress

Wang

Yao

Yue

et al. 2023

ACS Agric. Sci. Technol.

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“…The canola genotype-Rachna and camelina genotype-618 showed a response about plant morpho-physiological parameters under droughtstressed conditions and were identi ed as drought-tolerant genotypes as compared to the sensitive genotypes; canola genotype-Super and camelina genotype-611 which showed a drastic reduction in plant growth. Hu et al [111] revealed that Si responses had a favorable impact on development in tolerant genotypes under both control and stressful settings, suggesting that they could be yet another signi cant component. The applications of Si upregulate stomatal functions which permit some carbon xation by drought-tolerant cultivars as compared to sensitive genotypes may lead to increased water use effectiveness [112,113].…”

Section: Discussionmentioning

confidence: 99%

Foliar Application of Silicon Alleviates Adverse Effect of Drought Stress by improving Growth, Physiological attributes, and Antioxidant Defense of Camelina (Camelina sativa L.) and Canola (Brassica napus L.)

Shahzad¹,

Waraich²,

Saleem

et al. 2023

Preprint

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Purpose: Drought stress is a global phenomenon that poses harmful impacts on crop growth and development leading to yield losses in oilseed crops. Canola and camlina are highly sensitive to drought stress. The present study investigated the role of foliar-applied silicon to alleviate the harmful effect of drought stress in camelina and canola genotypes. Methods: Different concentrations of silicon (Si) foliar applications (NS= no spray, WS= water spray, Si-2= 2 mM Si, Si-4= 4 mM Si, Si-6= 6 mM Si) were used along with different levels of drought stress i.e., control (100% field-capacity) and drought stress (50% field-capacity), for two genotypes of camelina (611 and 618) and two canola genotypes (Super and Rachna). Results: Drought stress caused marked reductions in the growth of canola and camelina genotypes as compared with control-100% field capacity. Compared to control, drought stress decreased shoot length of canola and cameline by 25% and 28%, respectively. Physiological attributes were also decreased under drought stress as photosynthetic rate, relative water content (RWC), and chlorophyll content were decreased by 39, 38 and 42% in canola and 35, 45, and 39% in camelina, respectively, as compared to control. Drought stress was found to increase the oxidative damage in both crops. Foliar applications of Si improved the morpho-physiological and biochemical attributes in canola and camelina genotypes as compared to NS. Silicon applications at 4 mM upregulated the activities of catalase, superoxide dismutase, and peroxidase were increased by 16, 18, and 12% in canola and 17, 14, and 15% in camelina respectively, reducing the electrolyte leakage as compared to NS. Under drought stress, maximum improvements in plants performances were observed when Si was foliarly applied at 4 mM followed by 6 mM and 2 mM. Among the genotypes, canola genotype Rachna showed better performance as compared to Super, while camelina genotype 618 showed better performance as compared with 611. Conclusion: In crux, Si foliar application particularly at 4 mM improved the morpho-physiological and biochemical attributes in canola and camelina genotypes under drought-stressed conditions. The better growth and greater stress tolerance of Si-applied plants was attributed to maintaince of plant water status and photosynthetic pigments, lower oxidative damage, and higher activities of antioxidant enzymes under drought.

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“…This suggests that carbon dots may render soybeans to tolerate drought better. The association of carbon dots with aquaporins was also studied intensively in maize by Wang et al, and their findings demonstrated that foliar application of carbon dots increased the amount of water taken in by maize roots (89.3%) through the buildup of Pro (36.3%) and ABA (6.9%), as well as increased activity of the major aquaporins linked to water uptake (2.3–7.6% increase in related gene expression) …”

Section: Nanoenabled Strategies For Plant Stress Tolerance In Respons...mentioning

confidence: 98%

“…Photosynthesis is restricted when plants are stressed. , Nanomaterials can maintain plant photosynthesis at normal levels and promote root water uptake (Figure ). The NMs can increase the expression of ctg121 and ZemaCp002 , thus maintaining the stability of PSII . Under drought stress, NMs can boost photo reaction activity and release more energy.…”

Section: Molecular Mechanisms Of Nanoenabled Strategies Enhanced Stre...mentioning

confidence: 99%

“…162 The expression of up-regulated ctg134 and Pgk-1 is associated with CO 2 fixation. 74 Overexpression of NCED and ABA1 increases ABA content in plants, 163 while accumulation of ABA in roots upregulates AQP genes expression. 164 Water uptake by the roots is improved, and the drought signal transmitted from the roots to the leaves is diminished, which in turn promotes the opening of stomata on the leaf surface and return to normal growth.…”

Section: •−mentioning

confidence: 99%

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Nanoenabled Enhancement of Plant Tolerance to Heat and Drought Stress on Molecular Response

Zhao,

Wu,

Amde

et al. 2023

J. Agric. Food Chem.

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Physiological and molecular level understanding of advanced carbon dots to enhance maize drought tolerance: modulation of photosynthesis and signaling molecules

Abstract: Drought stress is posing severe threat to the global crop production. Herein, we report a solution to combat drought stress by employing advanced carbon dots, which are rationally designed with...

Cited by 17 publications

References 52 publications

Regulation Mechanisms of Nitrogen-Doped Carbon Dots in Enhanced Maize Photosynthesis under Drought Stress

Regulation Mechanisms of Nitrogen-Doped Carbon Dots in Enhanced Maize Photosynthesis under Drought Stress

Foliar Application of Silicon Alleviates Adverse Effect of Drought Stress by improving Growth, Physiological attributes, and Antioxidant Defense of Camelina (Camelina sativa L.) and Canola (Brassica napus L.)

Nanoenabled Enhancement of Plant Tolerance to Heat and Drought Stress on Molecular Response

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