Manganese-induced cadmium stress tolerance in rice seedlings: Coordinated action of antioxidant defense, glyoxalase system and nutrient homeostasis.
The accumulation of cadmium (Cd) alters different physiological and biochemical attributes that affect plant growth and yield. In our study, we investigated the regulatory role of supplemental manganese (Mn) on hydroponically grown rice (Oryza sativa L. cv. BRRI dhan29) seedlings under Cd-stress conditions. Exposure of 14-d-old seedlings to 0.3mM CdCl2for three days caused growth inhibition, chlorosis, nutrient imbalance, and higher Cd accumulation. Higher Cd uptake caused oxidative stress through lipid peroxidation, loss of plasma membrane integrity, and overproduction of reactive oxygen species (ROS) and methylglyoxal (MG). The exogenous application of 0.3mM MnSO4to Cd-treated seedlings partly recovered Cd-induced water loss, chlorosis, growth inhibition, and nutrient imbalance by reducing Cd uptake and its further translocation to the upper part of the plant. Supplemental Mn also reduced Cd-induced oxidative damage and lipid peroxidation by improved antioxidant defense and glyoxalase systems through enhancing ROS and MG detoxification, respectively.
Laboratory of Plant Stress Responses, Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun, Kagawa 761-0795, Japan; Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh.
Anisur
A
Rahman
Laboratory of Plant Stress Responses, Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun, Kagawa 761-0795, Japan; Department of Agricultural Botany, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh.
Kamrun
K
Nahar
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh.
Mirza
M
Hasanuzzaman
Laboratory of Plant Stress Responses, Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki-cho, Kita-gun, Kagawa 761-0795, Japan. Electronic address: fujita@ag.kagawa-u.ac.jp.
Masayuki
M
Fujita
D000975:Antioxidants / Q000494:pharmacology*; D002104:Cadmium / Q000633:toxicity*; D002734:Chlorophyll / Q000378:metabolism; D006706:Homeostasis / Q000187:drug effects*; D007791:Lactoylglutathione Lyase / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects; D008345:Manganese / Q000494:pharmacology*; D009747:Nutritional Physiological Phenomena / Q000187:drug effects*; D012275:Oryza / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D011765:Pyruvaldehyde / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects; D014867:Water / Q000378:metabolism
D000975:Antioxidants; D017382:Reactive Oxygen Species; D002104:Cadmium; D014867:Water; D002734:Chlorophyll; D008345:Manganese; D011765:Pyruvaldehyde; D007791:Lactoylglutathione Lyase
Antioxidant defense glyoxalase system; Metal accumulation; Methylglyoxal; Oxidative damage; Reactive oxygen species; Trace elements