کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6493405 1418055 2018 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cadmium toxicity and its amelioration by kinetin in tomato seedlings vis-à-vis ascorbate-glutathione cycle
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Cadmium toxicity and its amelioration by kinetin in tomato seedlings vis-à-vis ascorbate-glutathione cycle
چکیده انگلیسی
The supplementation of plant hormones may enhance the tolerance capacity of plants against certain environmental stresses by increasing their physiological functioning and detoxification capacity. To answer the question that whether a phytohormone 'kinetin' (KN, 6-furfuylaminopurine), one of the artificial cytokinins could ameliorate the cadmium induced toxicity in tomato seedlings, the effect of KN was assessed in differentially cadmium (Cd1: 3 mg kg− 1 sand and Cd2: 9 mg kg− 1 sand) intoxicated tomato seedlings by estimating the changes in reactive oxygen species (ROS, viz. superoxide radical and H2O2 generation) and probable alteration in photosystem II photochemistry, ascorbate-glutathione cycle enzymes and their metabolites. Accumulation of Cd in tomato seedlings increased the production of ROS by negatively impacting PS II photochemistry (decrease in Fv/Fm (ϕP0), Ψ0, ϕE0 and PIABS and increase in energy fluxes per reaction centre: ABS/RC, ET0/RC, TR0/RC and DI0/RC) manifested by lowered fresh mass despite the accelerated activity of AsA-GSH cycle enzymes (viz. ascorbate peroxidase, APX; glutathione reductase, GR; dehydroascorbate reductase, DHAR and monodehydroascorbate reductase; MDHAR). Simultaneous application of kinetin (10 μM) alleviated the negative effects on the fresh mass and lowered the ROS level by positively affecting PS II photochemistry and further rise in AsA-GSH cycle enzymes and their metabolites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 178, January 2018, Pages 76-84
نویسندگان
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