Bio‐Functionalized Manganese Nanoparticles Suppress Fusarium Wilt in Watermelon (Citrullus lanatus L.) by Infection Disruption, Host Defense Response Potentiation, and Soil Microbial Community Modulation

Abstract

The use of nanofabricated materials is being explored for the potential in crop disease management. Chemically synthesized micronutrient nanoparticles (NPs) have been shown to reduce crop diseases; however, the potential of biogenic manganese NPs (bio‐MnNPs) in disease control is unknown. Here, the potential and mechanism of bio‐MnNPs in suppression of watermelon Fusarium wilt, caused by Fusarium oxysporum f. sp. niveum (Fon) are reported. Bio‐MnNPs are synthesized by cell‐free cultural filtrate of a waterrmelon rhizosphere bacterial strain Bacillus megaterium NOM14, and are found spherical in shape with a size range of 27.0–65.7 nm. Application of bio‐MnNPs at 100 µg mL−1 increases Mn content in watermelon roots/shoots and improves growth performance through enhancing multiple physiological processes, including antioxidative capacity. Bio‐MnNPs at 100 µg mL−1 suppress Fusarium wilt through inhibiting colonization and invasive growth of Fon in watermelon roots/stems, and inhibit Fon vegetative growth, conidiation, conidial morphology, and cellular integrity. Bio‐MnNPs potentiate watermelon systemic acquired resistance by triggering the salicylic acid signaling upon Fon infection, and reshape the soil microbial community by improving fungal diversity. These findings demonstrate that bio‐MnNPs suppress watermelon Fusarium wilt by multiple ex planta and in planta mechanisms, and offer a promising nano‐enabled strategy for the sustainable management of crop diseases.

Fe-Based Nanomaterial-Induced Root Nodulation Is Modulated by Flavonoids to Improve Soybean (Glycine max) Growth and Quality

“…To find the systematic metabolic and transcriptional reprogramming in soybean induced by Fe-based NMs, the shoots and roots at the M1 stage were submitted to Personalbio Technology Co., Ltd. (Nanjing, China) for RNA-sequencing. Eighteen samples (three treatments × two tissues × three independent replicates) were tested, and DEGs were identified with a fold change ≥ 2 and p -value < 0.05 to reduce the complexity of the data set …”

Manganese Nanoparticles: Synthesis, Mechanisms of Influence on Plant Resistance to Stress, and Prospects for Application in Agricultural Chemistry

“…Zaojia and improved its growth performance by enhancing multiple physiological processes, including antioxidant capacity by affecting ROS accumulation, SOD activity, and MDA levels. 85 The content of MDA in the roots and stems of healthy plants treated with Mn NPs was reduced by 77−85%, the amount of ROS was reduced by 31−48% compared to the untreated control. At the same time, the activity of CAT, PER, and SOD were significantly increased compared to untreated control plants.…”

Bacillus altitudinis‐Stabilized Multifarious Copper Nanoparticles Prevent Bacterial Fruit Blotch in Watermelon (Citrullus lanatus L.): Direct Pathogen Inhibition, In Planta Particles Accumulation, and Host Stomatal Immunity Modulation

“…niveum , through enhancing multiple important physiological and disease suppressive processes, including antioxidative or immune pathways. [ 27 ] Although the synthesis of bio‐CuNPs for various eco‐agricultural applications has been a topic of recent investigation, their role in plant disease management remains somewhat unexplored. Therefore, the present study aimed to investigate the potential of bio‐CuNPs for controlling watermelon BFB, with a focus on uncovering critical mechanisms of action.…”