Abstract
To test the hypothesis that exogenous silicon (Si) would mediate the detoxification of Chromium (Cr) on pakchoi (Brassica Chinensis L.) growing in Cr-contaminated soil, a pot experiment that 0, 50, 100 and 200 mg·kg-1 Cr (Na2Cr2O72H2O) were supplied to soil together with 0, 0.5, 1.0 and 1.5 g·kg-1 Si (Na2SiO3) for 48 days, was studied. Results showed that supplying Si improved the growth of pakchoi in low Cr level. However, the shoot dry weight decreased with the increasing Si supplied in high Cr level. Compared with under non-Cr stress, the application of Si significantly increased the activities of POD, SOD and CAT of pakchoi under excess Cr. However, antioxidant enzymes activities displayed no difference under three Cr levels supplied. Shoot Cr accumulation decreased, while root Cr concentration increased, which was ascribed to the formation of precipitation-bound, “organic matter bound” Cr and the reduction of exchangeable-bound Cr fractions in the soil. Furthermore, the rhizosphere soil pH increased with Si level under either Cr level, suggesting that exogenous Si would induce the alkalization in the rhizosphere mediated detoxification of Cr on pakchoi by promoting the formation of precipitation-bound, organic matter bound Cr in Cr-contaminated soil, thereby probably decreasing Cr uptake from Cr-contaminated soil. These results proved direct evidence that Si played a mediated role, which decreased Cr uptake and improved the stabilization of Cr in Cr- contaminated soil.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Silicon improved pakchoi growth at low chromium level.
Not reportedComparator
Verbatim
e0“supplying Si improved the growth of pakchoi in low Cr level”
Claim · model-written summary
Shoot dry weight decreased with increasing silicon at high chromium level.
Verbatim
e0“the shoot dry weight decreased with the increasing Si supplied in high Cr level”
e1“growth of pakchoi”
Claim · model-written summary
Silicon significantly increased pakchoi POD activity under excess chromium.
Verbatim
e0“the application of Si significantly increased the activities of POD, SOD and CAT of pakchoi under excess Cr”
e1“Compared with under non-Cr stress”
Claim · model-written summary
Silicon significantly increased pakchoi SOD activity under excess chromium.
Verbatim
e0“the application of Si significantly increased the activities of POD, SOD and CAT of pakchoi under excess Cr”
e1“Compared with under non-Cr stress”
Claim · model-written summary
Silicon significantly increased pakchoi CAT activity under excess chromium.
Verbatim
e0“the application of Si significantly increased the activities of POD, SOD and CAT of pakchoi under excess Cr”
e1“Compared with under non-Cr stress”
Claim · model-written summary
Antioxidant enzyme activities did not differ among three chromium levels.
Verbatim
e0“antioxidant enzymes activities displayed no difference under three Cr levels supplied”
e1“the growth of pakchoi in low Cr level”
Claim · model-written summary
Shoot chromium accumulation decreased.
Verbatim
e0“Shoot Cr accumulation decreased”
e1“the growth of pakchoi in low Cr level”
Claim · model-written summary
Root chromium concentration increased.
Verbatim
e0“root Cr concentration increased”
e1“the growth of pakchoi in low Cr level”
Claim · model-written summary
Rhizosphere soil pH increased with silicon level under either chromium level.
Verbatim
e0“the rhizosphere soil pH increased with Si level under either Cr level”
e1“the growth of pakchoi in low Cr level”
Claim · model-written summary
Silicon decreased chromium uptake in pakchoi.
Not reportedComparator
Verbatim
e0“Si played a mediated role, which decreased Cr uptake”
e1“the growth of pakchoi in low Cr level”
Claim · model-written summary
Silicon improved chromium stabilization in contaminated soil.
Verbatim
e0“improved the stabilization of Cr in Cr- contaminated soil”
e1“Si played a mediated role”
e2“detoxification of Cr on pakchoi”
The same questions in other papers
silicon atom · growth · Brassica rapa (field mustard)Results differ
8 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- positive
7 papers more in this group
See all 11 papers →silicon atom · nutrient: content · Brassica rapa (field mustard)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
6 papers more in this group
See all 10 papers →silicon atom · physiology: antioxidant enzymes · Brassica rapa (field mustard)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.