PJB-2021-662
ROLE OF EXOGENOUS MELATONIN APPLICATION IN GROWTH AND PHYSIOLOGY OF WHITE BEAN GROWING IN SALINE AND NON-SALINE SOIL.
Muhammad Askari
Abstract
Melatonin (N-acetyl-5-methioxytryotamine) is an influential, multifunctional, non-toxic biological molecule found in almost every living organism from fungi to animal and can improve stress resistance and developmental process in plant. High concentration of salt in soil and in irrigation water is an important detrimental abiotic environmental factor that reduces plants growth, development, crop productivity, and reproduction by disturbing the ionic potential, osmotic potential, and composition of ion. Therefore, we aimed to determine the beneficial role of exogenously applied melatonin at three concentrations (25µM, 50µM and 100µM) in germination and development of White bean (Phaseolus Vulgaris L.) growing in saline (150mM NaCl) and non-saline soil. At the start of the third leaf stage, the equal length seedlings were subjected to treatments after three-day interval for four weeks, followed by the collection the samples of every week and measured all-important parameters. The results of this experiment revealed that, plant treated with salt stress led to decrease all the morphological and biochemical parameters such as shoot length, root length, leaf area, water content, photosynthetic contents, amount of protein and carbohydrate while, the level of phenol and proline having antioxidant activity increased with week in NaCl treatment. However, in saline and non-saline soil, the application of exogenous melatonin enhanced plant development and physiology. Interestingly, with the increasing concentration of exogenous melatonin treatment improved plants germination and biomass by stimulating the activity of antioxidant enzyme and 100µM melatonin gave best result as compared to 50µM and 25µM in both saline and non-saline soil.
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