Alleviation of chromium toxicity by hydrogen sulfide in barley - PubMed (original) (raw)
. 2013 Oct;32(10):2234-9.
doi: 10.1002/etc.2309. Epub 2013 Aug 21.
Affiliations
- PMID: 23775579
- DOI: 10.1002/etc.2309
Alleviation of chromium toxicity by hydrogen sulfide in barley
Shafaqat Ali et al. Environ Toxicol Chem. 2013 Oct.
Abstract
A hydroponic experiment was carried out to examine the effect of hydrogen sulfide (H2 S) in alleviating chromium (Cr) stress in barley. A 2-factorial design with 6 replications was selected, including 3 levels of NaHS (0 μM, 100 μM, and 200 μM) and 2 levels of Cr (0 μM and 100 μM) as treatments. The results showed that NaHS addition enhances plant growth and photosynthesis slightly compared with the control. Moreover, NaHS alleviated the inhibition in plant growth and photosynthesis by Cr stress. Higher levels of NaHS exhibited more pronounced effects in reducing Cr concentrations in roots, shoots, and leaves. Ultrastructural examination of plant cells supported the facts by indication of visible alleviation of cell disorders in both root and leaf with exogenous application of NaHS. An increased number of plastoglobuli, disintegration, and disappearance of thylakoid membranes and starch granules were visualized inside the chloroplast of Cr-stressed plants. Starch accumulation in the chloroplasts was also noticed in the Cr-treated cells, with the effect being much less in Cr + NaHS-treated plants. Hence, it is concluded that H2 S produced from NaHS can improve plant tolerance under Cr stress.
Keywords: Barley; Chloroplast ultrastructure; Chromium; Hydrogen sulfide; Photosynthesis.
© 2013 SETAC.
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