Chang P.-F.LChang T.-HLiu Y.-WChen C.-CLi W.-YChung W.-HLin J.-JHuang J.-W.JIANG-JEN LIN2021-08-052021-08-0520205677572https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082325846&doi=10.17660%2fActaHortic.2020.1269.36&partnerID=40&md5=a139826337200c96ffb496a1bc6594ddhttps://scholars.lib.ntu.edu.tw/handle/123456789/577191Nanomaterials (NMs) are defined as materials with particle sizes between 1 and 100 nm. Some NMs have potential applications for plant growth promotion and disease control. In this study, silver nanoparticles (in forms of nano-scale silica platelets (AgNP/NSP)) and nano-scale silica platelets (NSP), together with micro/nano-sized calcium-silica composites (NCaSi) were tested for their effects on seedling growth and disease control. The results showed that AgNP/NSP inhibited growth of fungal pathogens. We also tested the effects of AgNP/NSP, NSP, and NCaSi on the growth of Chinese cabbage (baby pak choi), lettuce, tomato, and watermelon. AgNP/NSP reduced seed germination, root elongation and seedling growth of some test plants. However, NCaSi promoted tomato seedling growth and reduced diseases. NCaSi induced the production of some pathogenesis-related proteins and stress proteins, and also provided protection to plants against pathogens. Thus, application of NMs in plant disease management should be carefully evaluated. ? 2020 International Society for Horticultural Science. All rights reserved.journal article10.17660/ActaHortic.2020.1269.362-s2.0-85082325846