PJB-2018-1720
Beneficial role of foliary-applied proline on carrot (Daucus carota L.) under saline conditions
Misbah Qirat, Muhammad Shahbaz and Shagufta Perveen
Abstract
A pot experiment was conducted to appraise the beneficial role of foliar application of proline on two cultivars of carrot (Daucus carota L.) cv. Arwa red long and cv. Red corl grown in pots under salt-stress conditions. There were two levels of salinity i.e. non-stress (0 mM) and NaCl stress (150 mM) and three levels of foliar applied proline (0, 5, 10 mM). Growth, gas exchange and chlorophyll fluorescence parameters decreased, while enzymes activities and proline contents increased in carrot plants under saline conditions. Proline treatment as foliar spray significantly enhanced growth, gas exchange, chlorophyll fluorescence, activity of peroxidase, root K+ and Ca2+ and shoot K+ contents, while decreased Na+ contents of root in both carrot cultivars. Arva Red Long showed better performance as compared to cultivar Red Corl due to improved growth, gas exchange characteristics, antioxidant enzymes activities (SOD, POD), high free proline and K+ and Ca2+ contents.
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