Cadmium-Tolerant Plant Growth-Promoting Bacteria Curtobacterium oceanosedimentum Improves Growth Attributes and Strengthens Antioxidant System in Chili ( Capsicum frutescens )

Mitesh Patel, Kartik Patel, Lamya Ahmed Al-Keridis, Nawaf Alshammari, Riadh Badraoui, Abdelbaset Mohamed Elasbali, Waleed Abu Al-Soud, Md Imtaiyaz Hassan, Dharmendra Kumar Yadav and Mohd Adnan
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Mitesh Patel: Bapalal Vaidya Botanical Research Centre, Department of Biosciences, Veer Narmad South Gujarat University, Surat 395007, India
Kartik Patel: Bapalal Vaidya Botanical Research Centre, Department of Biosciences, Veer Narmad South Gujarat University, Surat 395007, India
Lamya Ahmed Al-Keridis: Department of Biology, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh P.O. Box 84428, Saudi Arabia
Nawaf Alshammari: Department of Biology, College of Science, University of Hail, Hail P.O. Box 2440, Saudi Arabia
Riadh Badraoui: Department of Biology, College of Science, University of Hail, Hail P.O. Box 2440, Saudi Arabia
Abdelbaset Mohamed Elasbali: Department of Clinical Laboratory Science, College of Applied Sciences-Qurayyat, Jouf University, Al-Jouf P.O. Box 2014, Saudi Arabia
Waleed Abu Al-Soud: Department of Clinical Laboratory Sciences, Faculty of Applied Medical Sciences, Jouf University, Sakaka P.O. Box 2014, Saudi Arabia
Md Imtaiyaz Hassan: Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi 110025, India
Dharmendra Kumar Yadav: College of Pharmacy, Gachon University of Medicine and Science, Hambakmoeiro, Yeonsu-gu, Incheon City 21924, Korea
Mohd Adnan: Department of Biology, College of Science, University of Hail, Hail P.O. Box 2440, Saudi Arabia

Sustainability, 2022, vol. 14, issue 7, 1-18

Abstract: The remediation of potentially toxic element-polluted soils can be accomplished through the use of microbial and plant-assisted bioremediation. A total of 32 bacteria were isolated from soil samples contaminated with potentially toxic elements. The isolated bacterial strain DG-20 showed high tolerance to cadmium (up to 18 mM) and also showed bioaccumulative Cd removal properties, as demonstrated by atomic absorption spectroscopy studies. By sequencing the 16S rRNA gene, this strain was identified as Curtobacterium oceanosedimentum . Under stress and normal conditions, isolate DG-20 also produced a wide range of plant growth promoting traits, including ammonia production (51–73 µg/mL) and IAA production (116–183 µg/mL), alongside siderophore production and phosphate solubilization. Additionally, pot experiments were conducted to determine whether the strain could promote Chili growth when Cd salts are present. Over the control, bacterial colonization increased root and shoot lengths significantly up to 58% and 60%, respectively. Following inoculation with the Cd-tolerant strain, the plants also increased in both fresh and dry weight. In both the control and inoculated plants, Cd was accumulated more in roots than in shoots, indicating that Chili was phytostabilizing Cd levels. Besides improving the plant attributes, Cd-tolerant bacteria were also found to increase the amount of total chlorophyll, proline, total phenol, and ascorbic acid in the soil when added to the soil. These results suggest that the inoculant provides protection to plants from negative effects. The results of the present study predict that the combined properties of the tested strain in terms of Cd tolerance and plant growth promotion can be exploited for the purpose of the bioremediation of Cd, and for the improvement of Chili cultivation in soils contaminated with Cd.

Keywords: cadmium; biosorption; bioremediation; Curtobacterium oceanosedimentum; phytostabilization; Chili; heavy metals; PGPR; toxic elements (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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