Abstract
Hydrogen sulfide (H 2 S) plays a crucial role in regulating plant development and stress responses. Here, the potential role of H 2 S in enhancing cadmium (Cd) tolerance by modulating the antioxidant defense system and reactive oxygen species (ROS) homeostasis was investigated. The results shown that Cd (II) exposure significantly inhibited the growth and chlorophyll content of rapeseed seedlings. Optimal exogenous sodium hydrosulfide (NaHS; 50 μM) pretreatment markedly alleviated Cd–induced growth inhibition, chlorosis, and root morphology in contrast to increased Cd accumulation in the roots. The DW of the leaves and roots, and the total chlorophyll content increased by 23.8 %, 21.4 % and 114.8 %, respectively. Cd (II)–induced oxidative damage was significantly ameliorated by NaHS application through the reduction of hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 •− ) accumulation, which were up to 47.3 % and 67.6 %, respectively. Moreover, exogenous NaHS elevated the glutathione (GSH) content and GSH/glutathione disulfide (GSSG) ratio in Cd–stressed roots from 21.9 – 33.3 % and 39.3–87.4 %, respectively. The activity of antioxidant enzymes, with the exception of ascorbate peroxidase, was further elevated by NaHS application. These results suggest that H 2 S enhances Cd tolerance by augmenting GSH pools and activating antioxidant enzymes to control reactive oxygen species (ROS) homeostasis, thereby ameliorating Cd–induced oxidative stress in rapeseed seedling roots. • Exogenous H 2 S mitigates Cd toxicity in contrast to increases root Cd accumulation. • Exogenous H 2 S pretreatment reduced Cd-induced ROS accumulation and oxidative stress. • H 2 S pretreatment improved GSH pool by activating enzymes involved in GSH metabolism. • H 2 S pretreatment enhanced antioxidant defense by increasing antioxidative enzyme activity.
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Claims 11
Claim · model-written summary
Cadmium exposure significantly inhibited seedling growth and chlorophyll.
- Taxon
- rapeseede1
- Treatment
- Cd (II) exposuree0
- Outcome
- growth and chlorophyll contente0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“Cd (II) exposure significantly inhibited the growth and chlorophyll content of rapeseed seedlings”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS pretreatment alleviated cadmium-induced growth inhibition, chlorosis, and root morphology effects.
- Taxon
- rapeseede1
- Treatment
- sodium hydrosulfide (NaHS; 50 μM) pretreatmente0
- Outcome
- growth inhibition, chlorosis, and root morphologye0
- Direction
- alleviatede0
Not reportedComparator
Verbatim
e0“Optimal exogenous sodium hydrosulfide (NaHS; 50 μM) pretreatment markedly alleviated Cd–induced growth inhibition, chlorosis, and root morphology”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased cadmium accumulation in roots.
Verbatim
e0“in contrast to increased Cd accumulation in the roots”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased leaf dry weight by 23.8%.
Verbatim
e0“The DW of the leaves and roots, and the total chlorophyll content increased by 23.8 %, 21.4 % and 114.8 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased root dry weight by 21.4%.
Verbatim
e0“The DW of the leaves and roots, and the total chlorophyll content increased by 23.8 %, 21.4 % and 114.8 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased total chlorophyll content by 114.8%.
Verbatim
e0“The DW of the leaves and roots, and the total chlorophyll content increased by 23.8 %, 21.4 % and 114.8 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS reduced hydrogen peroxide accumulation by up to 47.3% under cadmium stress.
Verbatim
e0“reduction of hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 •− ) accumulation, which were up to 47.3 % and 67.6 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS reduced superoxide accumulation by up to 67.6% under cadmium stress.
Verbatim
e0“reduction of hydrogen peroxide (H 2 O 2 ) and superoxide (O 2 •− ) accumulation, which were up to 47.3 % and 67.6 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased glutathione content in cadmium-stressed roots by 21.9–33.3%.
Verbatim
e0“exogenous NaHS elevated the glutathione (GSH) content and GSH/glutathione disulfide (GSSG) ratio in Cd–stressed roots from 21.9 – 33.3 % and 39.3–87.4 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS increased the GSH/GSSG ratio in cadmium-stressed roots by 39.3–87.4%.
Verbatim
e0“exogenous NaHS elevated the glutathione (GSH) content and GSH/glutathione disulfide (GSSG) ratio in Cd–stressed roots from 21.9 – 33.3 % and 39.3–87.4 %, respectively”
e1“rapeseed seedlings”
Claim · model-written summary
NaHS elevated antioxidant enzyme activity except ascorbate peroxidase.
Verbatim
e0“The activity of antioxidant enzymes, with the exception of ascorbate peroxidase, was further elevated by NaHS application”
e1“rapeseed seedlings”
The same questions in other papers
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See all 8 papers →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.