Boron induces seed germination and seedling growth of Hordeum vulgare L. under NaCl stress
Boron (B), an essential micronutrient, helps the plants to complete their life cycle successfully. Therefore, the present experiment was conducted to study (1) role of B in seed germination and seedling growth, (2) toxicity effect of B in seed germination and seedling growth and (3) role of B in tolerance of barley (Hordeum vulgare L. var. ‘Bakore’) to NaCl stress. Under NaCl stress and non-stress conditions, application of high levels of B (100 µM) decreased parameters of germination (G%, VI, GI and MGT), growth (RL, SL, RFW, SFW, RDW and SDW), except accumulation of Pro and MDA in barley seedlings. Also, a fluorescence study reveals that production of ROS (H2O2 and O2—) and non-viable cells increased in roots of barley seedlings treated with NaCl and high dose of B. An alteration in anatomical structure of barley seedlings was observed with the application of NaCl and high dose of B. However, a low concentration of B (50 µM) proved best and increased germination and growth traits of barley seedlings by increasing accumulation of Pro. Also, 50 µM of B significantly increased biosynthesis of photosynthetic pigments (Chla, b and total Chl) and deceased formation of ROS and produced viable cells in roots. Therefore, concluded that sufficient dose of B could be beneficial for barley plant in improving the tolerance to NaCl stress.
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