L-Glutamine
is an essential amino acid used in plant tissue culture as a readily available source of organic nitrogen. While plants can synthesize glutamine from inorganic nitrogen (nitrates and ammonium) found in standard media like Murashige & Skoog (MS), providing it directly often significantly accelerates growth and improves the success of specific developmental stages.
Role in Plant Tissue Culture (2026 Standards)
In 2026, L-Glutamine remains a critical additive for high-performance micropropagation:
• Rapid Nitrogen Assimilation: It is more easily assimilated by plant cells than inorganic nitrogen, making it vital during high-stress phases like callus induction and embryo development.
• Enhancement of Somatic Embryogenesis: It is frequently added to "induction media" to improve the quality and number of somatic embryos formed.
• Cell Suspension Cultures: Supports rapid cell division in liquid cultures by providing a constant nitrogen supply.
• Alternative to Casein Hydrolysate: Used as a defined alternative to complex organic nitrogen sources like casein hydrolysate to ensure experimental reproducibility.
"Plant Culture Tested" Specification
When labeled as "Plant Culture Tested" (e.g., HiMedia TC043), the amino acid meets stringent 2026 quality controls:
• High Purity: Minimum assay of ≥99.0%
• Endotoxin and Contaminant Testing: Verified free of heavy metals and impurities that could cause phytotoxicity in delicate explants.
• Biological Efficacy: Tested specifically for its ability to support the growth of plant cell cultures in vitro.
Handling and Heat Sensitivity (Crucial)
L-Glutamine is notoriously heat-labile (unstable under heat):
• Avoid Autoclaving: Autoclaving L-Glutamine causes it to degrade into toxic ammonia and pyrrolidone carboxylic acid, which can inhibit plant growth.
• Filter Sterilization: In 2026 protocols, it must be dissolved in distilled water, filter-sterilized using a 0.22µm MCE syringe filter, and added to the autoclaved med
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