Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 29, Pages 44998-45012Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-18887-8
Keywords
Phytocomponents; Root exudates; Chrysopogon zizanioides; Lead; Chemotaxis; Rhizosphere
Categories
Funding
- DST-SERB [ECR/2017/001175]
- Science and Engineering Research Board [ECR/2017/001175]
- Radha Rani, TEQIP
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The chemical composition of root exudates and extracts from Chrysopogon zizanioides cv KS-1 under lead stress was determined. Significantly higher concentrations of various compounds were observed in the samples from plants grown under lead stress. GC-MS analysis revealed the presence of compounds related to plant development, rhizosphere microbiota regulation, and allelopathy. Furthermore, the study indicated that C. zizanioides exudates possess a chemotactic response for certain rhizospheric bacterial strains.
The chemical composition of root exudates and root extracts from Chrysopogon zizanioides (L.) Roberty cv KS-1 was determined in the presence of lead [Pb(II)]. Hitherto, no information is available in the literature concerning the phytochemical components of root exudates of C. zizanioides. Significantly higher concentrations of total carbohydrates (26.75 and 42.62% in root exudates and root extract, respectively), reducing sugars (21.46 and 56.11% in root exudates and root extract, respectively), total proteins (9.22 and 23.70% in root exudates and root extract, respectively), total phenolic acids (14.69 and 8.33% in root exudates and root extract, respectively), total flavonoids (14.30 and 12.28% in root exudates and root extract, respectively), and total alkaloids (12.48 and 7.96% in root exudates and root extract, respectively) were observed in samples from plants growing under Pb(II) stress in comparison to the respective controls. GC-MS profiling showed the presence of a diverse group of compounds in root exudates and extracts, including terpenes, alkaloids, flavonoids, carotenoids, plant hormones, carboxylic/organic acids, and fatty acids. Among the detected compounds, many have an important role in plant development, regulating rhizosphere microbiota and allelopathy. Furthermore, the results indicated that C. zizanioides exudates possess a chemotactic response for rhizospheric bacterial strains Bacillus licheniformis, Bacillus subtilis, and Acinetobacter junii Pb1.
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