Combined application of biochar and metal-tolerant bacteria alleviates cadmium toxicity by modulating the antioxidant defense mechanism and physicochemical attributes in rice (Oryza sativa L.) grown in cadmium-contaminated soil

生物炭 植物修复 APX公司 叶绿素 化学 农学 水稻 气孔导度 金属毒性 蒸腾作用 园艺 光合作用 过氧化氢酶 环境化学 植物 生物 抗氧化剂 重金属 生物化学 有机化学 热解 基因
作者
Shoaib Ahmad,Adiba Khan Sehrish,Sarah Owdah Alomrani,Lidan Zhang,Muhammad Waseem,Shamaila Noureen,Inam Ullah,Rohina Tabassam,Ghulam Abbas,Shafaqat Ali
出处
期刊:Plant Stress [Elsevier BV]
卷期号:11: 100348-100348 被引量:5
标识
DOI:10.1016/j.stress.2024.100348
摘要

Agricultural soil contamination by heavy metal (cadmium) is a widespread issue and causes deleterious effects on crops. One of the most effective and ecofriendly methods for cadmium detoxification is microbe-assisted phytoremediation and soil amendment with biochar. The current study investigated the combined effect of biochar (Parthenium hysterophorus L.) and microbes (Bacillus cereus strain B2) in alleviating cadmium toxicity in rice grown in cadmium-contaminated soil (0, 10, 15, and 20 mg/kg). Results revealed that cadmium caused damage to plant health. Maximum reduction in plant biomass, gas exchange parameters, and chlorophyll content was observed on cadmium 20 mg/kg. As compared with the sole application of biochar (2%) and microbes, the greatest plant height (33.68 %), photosynthetic rate (23.52%), stomatal conductance (48.93%), water use efficiency (21.41%), transpiration rate (58.87%), chlorophyll a (74.81%), chlorophyll b (31.28%), total chlorophyll (60.53%), and carotenoids (26.97%) were recorded with combined application of biochar and microbes. Similarly, superoxidase (SOD), catalase (CAT), peroxidase (POD), and absorbate peroxidase (APX) activity was significantly boosted by combined application of microbes and biochar (2%), which were 33.90%, 24.18%, 51.70%, and 19.06%, respectively, while significant reduction was found in the ROS (16.60%), (20.06%) and MDA (26.08%) content in rice plants. However, cadmium concentrations in different parts of plant were decreased at higher concentrations of biochar (2%) with microbes. These findings indicate that combined application of Bacillus cereus strain B2 and biochar could be a promising strategy for reducing rice crop cadmium toxicity and boosting its growth, physiology, and defense system efficiently as compared with sole application.
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