Depolymerised carrageenan enhances physiological activities and menthol production in Mentha arvensis L. |
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Authors: | M. Naeem Mohd. IdreesTariq Aftab M. Masroor A. KhanMoinuddin Lalit Varshney |
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Affiliation: | a Plant Physiology Section, Department of Botany, Aligarh Muslim University, Aligarh 202 002 India b Radiation Technology Development Division, ISOMED, Bhabha Atomic Research Centre, Mumbai 400085, India |
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Abstract: | Irradiated carrageenan (IC) could elicit plant growth promoting activities in plants. The effect of foliar spray of five concentrations of IC (20, 40, 60, 80 and 100 mg L−1) was studied on Mentha arvensis L. in terms of plant growth, physiological attributes, herbage yield and the content and yield of essential oil and its components. Un-irradiated carrageenan and deionized water had no effect on the attributes studied. GPC study revealed formation of low molecular weight fractions in irradiated samples containing less than 20,000 molecular weight oligomers which are responsible for plant growth promotion in this study. 80 mg L−1 of IC was the most effective concentration which resulted in the highest values of growth attributes, herbage yield and the content and yield of essential oil and menthol content of the oil. It also improved the leaf-nutrient contents, photosynthetic rate and other physiological parameters. 100 mg L−1 of IC did not further improve the attributes studied, but it was always better than the control. |
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Keywords: | Irradiated carrageenan Growth and photosynthetic parameters Content and yield of essential oil Active constituents Mentha arvensis L. |
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