The effect of plant growth-promoting rhizobacteria on the growth, physiology, and Cd uptake of Arundo donax L

In this study, plant growth-promoting potential isolates from rhizosphere of 10 weed species grown in heavy metal-contaminated areas were identified and their effect on growth, antioxidant enzymes, and cadmium (Cd) uptake in Arundo donax L. was explored. Plant growth-promoting traits of isolates wer...

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Published in:	International journal of phytoremediation Vol. 19; no. 4; pp. 360 - 370
Main Authors:	Sarathambal, Chinnathambi, Khankhane, Premraj Jagoji, Gharde, Yogita, Kumar, Bhumesh, Varun, Mayank, Arun, Sellappan
Format:	Journal Article
Language:	English
Published:	United States Taylor & Francis 03-04-2017 Taylor & Francis Ltd
Subjects:	16S rRNA sequencing antioxidant enzymes Antioxidants Arundo donax, cadmium Bacillus Bacteria Bacteria - metabolism Biodegradation, Environmental Bioremediation Cadmium Cadmium - metabolism Enzymes Genes Inoculation Plant growth plant growth-promoting rhizobacteria (PGPR) Plant Roots - microbiology Plant Roots - physiology Poaceae - growth & development Poaceae - microbiology Poaceae - physiology Soil Microbiology Soil Pollutants - metabolism Uptakes Weeds Arundo donax, cadmium antioxidant enzymes plant growth-promoting rhizobacteria (PGPR) 16S rRNA sequencing
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Summary:	In this study, plant growth-promoting potential isolates from rhizosphere of 10 weed species grown in heavy metal-contaminated areas were identified and their effect on growth, antioxidant enzymes, and cadmium (Cd) uptake in Arundo donax L. was explored. Plant growth-promoting traits of isolates were also analyzed. These isolates were found to produce siderophores and enzymes such as 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and aid in solubilization of mineral nutrients and modulate plant growth and development. Based on the presence of multiple plant growth-promoting traits, isolates were selected for molecular characterization and inoculation studies. Altogether, 58 isolates were obtained and 20% of them were able to tolerate Cd up to 400 ppm. The sequence analysis of the 16S rRNA genes indicates that the isolates belong to the phylum Firmicutes. Bacillus sp. along with mycorrhizae inoculation significantly improves the growth, the activity of antioxidants enzymes, and the Cd uptake in A. donax than Bacillus alone. Highly significant correlations were observed between Cd uptake, enzymatic activities, and plant growth characteristics at 1% level of significance. The synergistic interaction effect between these organisms helps to alleviate Cd effects on soil. Heavy metal-tolerant isolate along with arbuscular mycorrhizae (AM) could be used to improve the phytoremedial potential of plants.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1522-6514 1549-7879
DOI:	10.1080/15226514.2016.1225289