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Shoolini University of Biotechnology and Management Sciences (2016)

Osmoprotectant mediated salinity stress tolerance in Himalayan medicinal plant Silybum marianum L

Singh, Ms Somvir

Titre : Osmoprotectant mediated salinity stress tolerance in Himalayan medicinal plant Silybum marianum L

Auteur : Singh, Ms Somvir

Université de soutenance : Shoolini University of Biotechnology and Management Sciences

Grade : Master of Philosophy (PhD) 2016

Résumé
Silybum marianum L., a medicinal plant, was subjected to abiotic stress, namely, salinity NaCl (25mM, 50mM, 100mM 150mM and 200mM) and osmolytes (50ppm and 100ppm) in order to see their impact on morphological, physiological, biochemical parameters on S. marianum. The study revealed that salinity stress cause significant increase in seed germination except high saline conditions (NaCl 200mM) and increase in length of root, plant height, fresh weight, and decreases in shoot length and dry weight. Osmolytes play a significant role to increases relative water content. Constitutive activities of CAT, POD, MDA, and total phenol showed an enhancement due to stress and decreases by osmolytes studied. The results suggest that S. marianum has a protection mechanism against oxidative damage by maintaining higher constitutive and induced activities of enzymatic and non-enzymatic antioxidants and high content of its therapeutically active constituents. Overall results showed that the osmolytes play a significant role on physiological and biochemical consequences of S. marianum under salinity stress

Mots clés : Abiotic stress, antioxidant medicinal plants osmolytes salinity Silybum marianum

Présentation et version intégrale (Shodhganga)

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