Low energy (25 keV) N+ ions were implanted into liquorice (Glycyrrhiza uralensis) seeds at a fluency of either zero (control) or 900 × (2.6 × 1013) ions/cm2. After irradiation, all the seeds were planted in the plastic pots for a growth period of one month. Thereafter, the seedlings in the pot were subjected to saline stress at 600 mM for about 3 days. The morphological and physiological characteristics such as total chlorophyll content, proline level, activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ATPase, and triphenyl tetrazolium chloride (TTC) reduction in seedling roots were investigated. Our results indicated that ion irradiation significantly increased the shoot height, leaflet number, taproot lenght, lateral root number, and shoot and root weights of liquorice seedlings with or without saline stress. Furthermore, the total chlorophyll content, proline level, SOD, POD, CAT, ATPase activities, and root TTC reduction vigor of seedlings were all found to be significantly increased under saline stress by ion irradiation compared with their corresponding controls. These results indicated that ion irradiation can strengthen the resistance of liquorice seedlings to saline stress and may have a potential application for the improvement of plants in sand areas.
Russian Journal of Plant Physiology – Springer Journals
Published: May 15, 2008
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