Cadmium-induced upregulation of lipid peroxidation and reactive oxygen species caused physiological, biochemical, and ultrastructural changes in upland cotton seedlings.
Cadmium (Cd) toxicity was investigated in cotton cultivar (ZMS-49) using physiological, ultrastructural, and biochemical parameters. Biomass-based tolerance index decreased, and water contents increased at 500 μM Cd. Photosynthetic efficiency determined by chlorophyll fluorescence and photosynthetic pigments declined under Cd stress. Cd contents were more in roots than shoots. A significant decrease in nutrient levels was found in roots and stem. A significant decrease in nutrient levels was found in roots and stems. In response to Cd stress, more MDA and ROS contents were produced in leaves than in other parts of the seedlings. Total soluble proteins were reduced in all parts except in roots at 500 μM Cd. Oxidative metabolism was higher in leaves than aerial parts of the plant. There were insignificant alterations in roots and leaves ultrastructures such as a little increase in nucleoli, vacuoles, starch granules, and plastoglobuli in Cd-imposed stressful conditions. Scanning micrographs at 500 μM Cd showed a reduced number of stomata as well as near absence of closed stomata. Cd depositions were located in cell wall, vacuoles, and intracellular spaces using TEM-EDX technology. Upregulation of oxidative metabolism, less ultrastructural modification, and Cd deposition in dead parts of cells show that ZMS-49 has genetic potential to resist Cd stress, which need to be explored.
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China ; Department of Biotechnology and Genetic Engineering, Kohat University of Science and Technology, Kohat 26000, Pakistan.
Muhammad Daud
MD
Khan
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China.
Lei
L
Mei
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China.
Basharat
B
Ali
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China.
Yue
Y
Chen
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China.
Xin
X
Cheng
Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Zijingang Campus, Hangzhou, China.
S J
SJ
Zhu
D000975:Antioxidants / Q000378:metabolism; D002104:Cadmium / Q000633:toxicity*; D003368:Gossypium / Q000187:drug effects* / Q000648:ultrastructure; D015227:Lipid Peroxidation / Q000187:drug effects*; D018384:Oxidative Stress / Q000187:drug effects; D018515:Plant Leaves / Q000378:metabolism / Q000648:ultrastructure; D018517:Plant Roots / Q000648:ultrastructure; D017382:Reactive Oxygen Species / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects* / Q000648:ultrastructure
D000975:Antioxidants; D017382:Reactive Oxygen Species; D002104:Cadmium