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Halophytes can be good choice to exploit saline resources for economical purposes. Phragmites karka (Retz.) Trin. ex Steud., is an invasive perennial grass potentially useful for bioenergy and medicinal purposes. It is widely distributed from saline wetlands to dry habitats and resist NaCl at both seed germination and growth levels. Some ecophysiological mechanisms of P. karka are reported in literature, however, effect of salinity on its anatomical features, water relations, leaf pigments and activity of antioxidants are not well understood. Plants were grown in plastic pots containing sandy soil and sub-irrigated with Hoagland solution under 0, 100 and 300 mM NaCl for two months. Fresh and dry biomass, plant length, leaf and stomata number were decreased with increasing salinity. Midrib thickness improved at 100 mM NaCl, while area of aerenchyma and leaf osmotic potential were unchanged. Water and osmotic potentials were decreased with increasing NaCl, compared to control treatment. Total antioxidant capacity (TAC), 2,2’- azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS), anthocyanins, betacyanins and chlorophylls were increased in salinity treatments. These results indicate that survival of P. karka could be associated with enhanced antioxidant activity, pigmentation pattern and anatomical adjustment in saline condition.
Noor Fatima, Zainul Abideen, Muhammad Qasim, Bilquees Gul, Muhammad Ajmal Khan. (2019) SALINITY RESISTANCE IS LINKED WITH ANTIOXIDANT ACTIVITY, PIGMENTATION PATTERN AND ANATOMICAL ADJUSTMENTS IN PHRAGMITES KARKA (Retz.) Trin. ex Steud., , Volume 16, Issue 3.
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