Effects of microbial biostimulants (Trichoderma album and Bacillus megaterium) on growth, quality attributes, and yield of onion under field conditions

• DOI: 10.1016/j.heliyon.2023.e14203
• Publication Date: 2023-03-02T02:37:10Z
• Authors: Nabil A. Younes; Touhidur Rahman Anik; Md. Mezanur Rahman; Ahmed A. Wardany; Mona F.A. Dawood; Lam-Son Phan Tran; A.A.H. Abdel Latef; Mohammad Golam Mo...
• Keywords: Bacillus megaterium; Bulb; Nutraceutical

Microbial biostimulants (MBs) promote plant growth and stress tolerance in a sustainable manner. However, precise field trials of MBs are required natural setting with range crop varieties to harness the benefits on yield improvement. This study investigated effects two MBs, Trichoderma album Bacillus megaterium, an onion cultivar's growth, nutritional qualities, antioxidant properties, potentials under conditions for successive years. Before transplantation, bulbs were gelatin-coated 2.0 4.0 g L-1 each MB. Results revealed that MBs-pretreated plants exhibited better indices, photosynthetic pigment contents, yield-attributing features like bulb weight than control plants. Nutraceutical analysis demonstrated T. album-pretreated (by L-1) cultivar enhanced level K+ 105.79%), Ca2+ 37.77%), proline 34.21%), total free amino acids 144.58%) tissues over Intriguingly, pretreatment both B. megaterium increased levels soluble carbohydrates 19.10 84.02%), as well including activities superoxide dismutase 58.52 31.34%), catalase 164.71 232%), ascorbate peroxidase 175.35 212.69%), glutathione-S-transferase 31.99 9.34%) improved contents ascorbic acid 19.1 44.05%), glutathione 6.22 33.82%), flavonoids 171.98 56.24%, respectively) Although promoted nutraceutical qualities bulbs, showed settings. Based morphophysiological attributes biochemical low dose (2.0 was more effective high (4.0 promoting growth. Overall, current research findings imply might be potential MB improving quality attributes, hence productivity cultivars circumstances.