Influence of Radiation-Processed Polysaccharides on Performance of Peppermint

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Recognized as one of the earliest medicinal and aromatic plants of global economic importance, peppermint ( Mentha piperita L.) is a hybrid of Mentha aquatica and Mentha spicata , chiefly valued for its essential oil containing a high amount of monoterpenes—menthol, menthone, and menthyl acetate. Essential oils in peppermint induce a wide range of uses in the pharmaceutical, cosmetics, food, and aromatherapy industries. 140 Peppermint, cultivated in different areas of India, with Uttar Pradesh as the major center of cultivation. Enhancing peppermint yield and oil quality has been a major priority due to increased industrial demand. In recent years, radiation-processed polysaccharides (RPPs) derived from marine sources such as carrageenan, chitosan, and sodium alginate have emerged as effective stimulants for improving plant growth, physiology, and secondary metabolism. Radiation processing reduces polysaccharide molecular weight into bioactive oligomers that stimulate photosynthesis, nutrient uptake, enzymatic activity, antioxidant defenses, or essential oil accumulation when applied foliarly. Experimental evidence found that irradiated chitosan, sodium alginate, and carrageenan experiencing foliar application resulted in significantly enhanced peppermint growth characteristics, chlorophyll content, enzyme activities, and essential oil yield, with significantly increased menthol content. RPPs therefore have a lot of potential to increase peppermint yield and medicinal value while maintaining environmental sustainability

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