Journal of Integrative Agriculture ›› 2023, Vol. 22 ›› Issue (10): 3069-3080.DOI: 10.1016/j.jia.2023.02.034

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  • 收稿日期:2022-12-05 接受日期:2023-02-05 出版日期:2023-10-20 发布日期:2023-10-07

Exploring the nano-fungicidal efficacy of green synthesized magnesium oxide nanoparticles (MgO NPs) on the development, physiology, and infection of carrot (Daucus carota L.) with Alternaria leaf blight (ALB): Molecular docking

Lukman AHAMAD1, 2, Azmat ALI KHAN3, Masudulla KHAN1, 4#, Orudzhev FARID5, Mahboob ALAM6#   

  1. 1 Plant Pathology/Nematology Laboratory, Department of Botany, Aligarh Muslim University, Aligarh 202002, India
    2 Regional Plant Quarantine Station, Salt Lake, Kolkata 700097, India
    3 Pharmaceutical Biotechnology Laboratory, Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
    4 Botany Section, Women’s College, Aligarh Muslim University, Aligarh 202002, India
    5 Amirkhanov Institute of Physics, Dagestan Federal Scientific Center, Russian Academy of Sciences, Makhachkala 367003, Russia
    6 Department of Safety Engineering, Dongguk University, Gyeongju-si 780714, Republic of Korea

  • Received:2022-12-05 Accepted:2023-02-05 Online:2023-10-20 Published:2023-10-07
  • About author:#Correspondence Masudulla Khan, E-mail: masudkhann@gmail.com; Mahboob Alam, E-mail: mahboobchem@gmail.com
  • Supported by:
    This work was funded by the Researchers Supporting Project Number (RSP2023R339) at King Saud University, Riyadh, Saudi Arabia.

Abstract:

In this research, green synthesized magnesium oxide nanoparticles (MgO NPs) from lemon fruit extracts and their fungicidal potential was evaluated against Alternaria dauci infection on carrot (Daucus carota L.) under greenhouse conditions.  The scanning and transmission electron microscopy (SEM and TEM) and ultra-violet (UV) visible spectroscopy were used to validate and characterize MgO NPs.  The crystalline nature of MgONPs was determined using selected area electron diffraction (SAED).  MgO NPs triggered substantial antifungal activity against Adauci when exposed to 50 and 100 mg L–1 concentrations but the higher antifungal potential was noticed in 100 mg L–1 under in-vitro conditions.  In fungal inoculated plants, a marked decrease in growth, photosynthetic pigments, and an increase in phenol, proline contents, and defense-related enzymes of carrot were seen over control (distilled water).  However, foliar application of MgO NPs at 50 and 100 mg L–1 resulted in significant improvement of plant growth, photosynthetic pigments, phenol and proline contents, and defense enzymes activity of carrots with and without Adauci infection.  Spraying of MgO NPs at 100 mg L–1 had more plant length (17.11%), shoot dry weight (34.38%), plant fresh weight (20.46%), and root dry weight (49.09%) in carrots when challenged with A. dauci over inoculated control.  The leaf blight indices and percent disease severity were also reduced in Adauci inoculated plants when sprayed with MgO NPs.  The non-bonding interactions of Alternaria genus protein with nanoparticles were studied using molecular docking.

Key words: green synthesis ,  MgO nanoparticles ,  alternaria leaf blight ,  photosynthetic pigments ,  defense enzymes ,  carrot