PreprintArticleVersion 1Preserved in Portico This version is not peer-reviewed
Size-Dependent Disease Resistance Enhancement of Hollow Mesoporous Silica Nanoparticles in Cowpea Plant Involved in Salicylic Acid Mediated Systemic Acquired Resistance for Fusarium Wilt Control
Ding, C.; Zhang, Y.; Chen, C.; Wang, J.; Qin, M.; Gu, Y.; Zhang, S.; Wang, L.; Luo, Y. Hollow Mesoporous Silica Nanoparticles as a New Nanoscale Resistance Inducer for Fusarium Wilt Control: Size Effects and Mechanism of Action. Int. J. Mol. Sci.2024, 25, 4514.
Ding, C.; Zhang, Y.; Chen, C.; Wang, J.; Qin, M.; Gu, Y.; Zhang, S.; Wang, L.; Luo, Y. Hollow Mesoporous Silica Nanoparticles as a New Nanoscale Resistance Inducer for Fusarium Wilt Control: Size Effects and Mechanism of Action. Int. J. Mol. Sci. 2024, 25, 4514.
Ding, C.; Zhang, Y.; Chen, C.; Wang, J.; Qin, M.; Gu, Y.; Zhang, S.; Wang, L.; Luo, Y. Hollow Mesoporous Silica Nanoparticles as a New Nanoscale Resistance Inducer for Fusarium Wilt Control: Size Effects and Mechanism of Action. Int. J. Mol. Sci.2024, 25, 4514.
Ding, C.; Zhang, Y.; Chen, C.; Wang, J.; Qin, M.; Gu, Y.; Zhang, S.; Wang, L.; Luo, Y. Hollow Mesoporous Silica Nanoparticles as a New Nanoscale Resistance Inducer for Fusarium Wilt Control: Size Effects and Mechanism of Action. Int. J. Mol. Sci. 2024, 25, 4514.
Abstract
In agriculture, soil-borne fungal pathogens, especially Fusarium oxysporum strains, are posing a serious threat to efforts to achieve global food security. In the search for safer agrochemicals, silica nanoparticles (SiO2NPs) have recently been proposed as a new tool to alleviate pathogen damage including Fusarium wilt. Hollow mesoporous silica nanoparticles (HMSNs), a unique class of SiO2NPs, have been widely accepted as a desired pesticide carrier. However, their role in enhancing the disease resistance and the specific mechanism remain unknown. In this study, three sizes of HMSNs (19, 96 and 406 nm as HMSNs–19, HMSNs–96 and HMSNs–406, respectively) were synthesized and characterized to determine their effects on seed germination, seedling growth, and Fusarium oxysporum f. sp. phaseolus (FOP) suppression in cowpea roots by foliar spray using phenotypes, fresh biomass and disease progression as indicators. The results revealed that three HMSNs exhibited no adverse impacts on seed germination and tended to improve plant growth. Also, they exert their FOP suppression with a size- and concentration-dependent manner. HMSNs–406 possessed the best control effect at a concentration of 1000 mg/L showing an upto 40.00% decline in the disease severity. The Si(OH)4 control was also effective on FOP suppression at a lower concentration of 100 mg/L, whereas its higher concentrations exhibited obviously adverse impacts on FOP control, seed germination and plant growth. Moreover, we conformed that HMSNs posed their Fusarium wilt suppression in cowpea plant by activating SA (salicylic acid)-dependent SAR (systemic acquired resistance) responses rather than directly suppressing FOP. A higher level of SA content and elevated expression of its maker genes of PR-1 and PR-5 in HMSNs–406 treated cowpea roots provided substantial evidences of this mode of action. Other resistance-related genes, as well as defense-responsive enzymes, were also involved in the HMSNs-activated SAR pathway. Overall, for the first time, our results extended a new role of HMSNs as a potent elicitor to serve as a versatile alternative for plant disease protection of low cost, highly efficiency and sustainability.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
