Abstract
Chromium (Cr) is a harmful heavy metal that poses a serious threat to plants and animals. Selenium (Se) and molybdenum (Mo) are two beneficial elements for plant growth and resistance. However, their interactive effects on Cr uptake and distribution are poorly understood. Therefore, a hydroponics experiment was conducted to explore the effects of the use of Se and Mo alone and simultaneously on mitigating Cr toxicity. In this study, Nicotiana tabacum L. seedlings were exposed to control, 50 µM Cr, 50 μM Cr + 2 μM Se, 50 μM Cr + 1 μM Mo, or 50 μM Cr + 2 μM Se + 1 μM Mo in Hoagland solution. After 2 weeks, the plant biomass, Cr, Se and Mo contents, photosynthesis, leaf ultrastructure, antioxidant system, subcellular distribution and associated gene expression in Nicotiana tabacum L. were determined. The results showed that simultaneous use of Se and Mo promoted tobacco growth under Cr stress, as evidenced by reducing reactive oxygen species (ROS) content and reducing Cr translocation factor (TF) and inducing a 51.3% reduction in Cr content in shoots. Additionally, Se-Mo interactions increased the levels of glutathione (GSH) and phytochelatin (PC) and the distribution of Cr in the cell walls and organelles. Furthermore, the relative expression of PCS1 was upregulated, while those of NtST1 and MSN1 were downregulated. The results concluded that the simultaneous use of Se and Mo effectively alleviated Cr toxicity in Nicotiana tabacum L., which not only offers an efficient way for crops to resist Cr toxicity but also provides evidence for the benefit of Se combined with Mo.
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Claims 9
Claim · model-written summary
Combined Se and Mo promoted tobacco growth under Cr stress.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- simultaneous use of Se and Moe0
- Outcome
- tobacco growthe0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simultaneous use of Se and Mo promoted tobacco growth under Cr stress”
Claim · model-written summary
Combined Se and Mo reduced reactive oxygen species content.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- simultaneous use of Se and Moe0
- Outcome
- reactive oxygen species (ROS) contente0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simultaneous use of Se and Mo promoted tobacco growth under Cr stress, as evidenced by reducing reactive oxygen species (ROS) content”
t0“Nicotiana tabacum L.”
Claim · model-written summary
Combined Se and Mo reduced Cr translocation factor.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- simultaneous use of Se and Moe1
- Outcome
- Cr translocation factor (TF)e0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing Cr translocation factor (TF)”
e1“The results showed that simultaneous use of Se and Mo promoted tobacco growth under Cr stress”
t0“Nicotiana tabacum L.”
Claim · model-written summary
Combined Se and Mo reduced shoot Cr content by 51.3%.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- simultaneous use of Se and Moe1
- Outcome
- Cr content in shootse0
- Direction
- reductione0
- Value
- 51.3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inducing a 51.3% reduction in Cr content in shoots”
e1“The results showed that simultaneous use of Se and Mo promoted tobacco growth under Cr stress”
t0“Nicotiana tabacum L.”
Claim · model-written summary
Se-Mo interactions increased glutathione and phytochelatin levels.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- Se-Mo interactionse0
- Outcome
- levels of glutathione (GSH) and phytochelatin (PC)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Se-Mo interactions increased the levels of glutathione (GSH) and phytochelatin (PC)”
t0“Nicotiana tabacum L.”
Claim · model-written summary
Se-Mo interactions increased Cr distribution in cell walls and organelles.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- Se-Mo interactionse0
- Outcome
- distribution of Cr in the cell walls and organellese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Se-Mo interactions increased the levels of glutathione (GSH) and phytochelatin (PC) and the distribution of Cr in the cell walls and organelles.”
t0“Nicotiana tabacum L.”
Claim · model-written summary
PCS1 relative expression was upregulated after combined Se and Mo treatment.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- Se-Mo interactionse1
- Gene
- PCS1e0
- Outcome
- relative expression of PCS1e0
- Direction
- upregulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative expression of PCS1 was upregulated”
e1“Se-Mo interactions”
t0“Nicotiana tabacum L.”
Claim · model-written summary
NtST1 relative expression was downregulated after combined Se and Mo treatment.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- Se-Mo interactionse1
- Gene
- NtST1e0
- Outcome
- NtST1e0
- Direction
- downregulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of NtST1 and MSN1 were downregulated”
e1“Se-Mo interactions”
t0“Nicotiana tabacum L.”
Claim · model-written summary
MSN1 relative expression was downregulated after combined Se and Mo treatment.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacumt0
- Treatment
- Se-Mo interactionse1
- Gene
- MSN1e0
- Outcome
- MSN1e0
- Direction
- downregulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of NtST1 and MSN1 were downregulated”
e1“Se-Mo interactions”
t0“Nicotiana tabacum L.”
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