Please have a look at these PDFs, probably you could find them useful.

Dear Adriane, many thanks for this very interesting technical question. I think that for the preparation of methyl jasmonate the references suggested by Anoop Kumar Srivastava are already quite useful. I'm just wondering if you really want to synthesize this compound yourself. You might consider using a commercially available sample of methyl jasmonate for your planned study.

For some potentially useful information about methyl jasmonate elicitation please have a look at the following references:

Elicitors in Plant Tissue Culture

Article Elicitors in Plant Tissue Culture

and

Methyljasmonate Elicitation Increases Terpenoid Indole Alkaloid Accumulation in Rhazya stricta Hairy Root Cultures

Article Methyljasmonate Elicitation Increases Terpenoid Indole Alkal...

Both articles have been posted as public full texts on RG and can be freely downloaded as pdf files.

As for making a stock solution of methyl jasmonate, please check the answers given to the following closely related RG thread:

Can anybody tell me how to prepare Methyl jasmonate stock solution and is it necessary to filter sterilize it before adding to medium?

https://www.researchgate.net/post/Can_anybody_tell_me_how_to_prepare_Methyl_jasmonate_stock_solution_and_is_it_necessary_to_filter_sterilize_it_before_adding_to_medium

Good luck with your research and best wishes, Frank Edelmann

Thank you for the reply! I will read all the articles that you recommended. Have a great week!

Dear Adriane make stock solution of MeJa (mg/ml) and add it before sterilization process. no need to filteration of stock solution.