Gene/Protein
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Drug
Enzyme
Compound
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Gene/Protein
Disease
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Target Concepts:
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Query: UMLS:C0008272 (
chlorosis
)
2,195
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Hydrogen sulphide (
H2S
) is emerging as a potential molecule involved in physiological regulation in plants. However, whether
H2S
regulates iron-shortage responses in plants is largely unknown. Here, the role of
H2S
in modulating iron availability in maize (Zea mays L. cv Canner) seedlings grown in iron-deficient culture solution is reported. The main results are as follows: Firstly, NaHS, a donor of
H2S
, completely prevented leaf interveinal
chlorosis
in maize seedlings grown in iron-deficient culture solution. Secondly, electron micrographs of mesophyll cells from iron-deficient maize seedlings revealed plastids with few photosynthetic lamellae and rudimentary grana. On the contrary, mesophyll chloroplasts appeared completely developed in
H2S
-treated maize seedlings. Thirdly,
H2S
treatment increased iron accumulation in maize seedlings by changing the expression levels of iron homeostasis- and sulphur metabolism-related genes. Fourthly, phytosiderophore (PS) accumulation and secretion were enhanced by
H2S
treatment in seedlings grown in iron-deficient solution. Indeed, the gene expression of ferric-phytosiderophore transporter (ZmYS1) was specifically induced by iron deficiency in maize leaves and roots, whereas their abundance was decreased by NaHS treatment. Lastly,
H2S
significantly enhanced photosynthesis through promoting the protein expression of ribulose-1,5-bisphosphate carboxylase large subunit (RuBISCO LSU) and phosphoenolpyruvate carboxylase (PEPC) and the expression of genes encoding RuBISCO large subunit (RBCL), small subunit (RBCS), D1 protein (psbA), and PEPC in maize seedlings grown in iron-deficient solution. These results indicate that
H2S
is closely related to iron uptake, transport, and accumulation, and consequently increases chlorophyll biosynthesis, chloroplast development, and photosynthesis in plants.
...
PMID:Hydrogen sulphide improves adaptation of Zea mays seedlings to iron deficiency. 2620 45
The association between
hydrogen sulfide
(H
2
S) and cell wall composition with regard to the mitigation of cadmium (Cd) toxicity in Brassica napus L. was investigated. Cd caused growth retardation, leaf
chlorosis
, and decreased endogenous H
2
S content in Brassica napus roots. Stimulating l-cysteine desulfhydrase (LCD)-mediated H
2
S production with H
2
S releaser (NaHS) markedly improved plant growth, reduced Cd content in stems and leaves, and rescued Cd-induced
chlorosis
. Furthermore, increased Cd retention was observed in root cell walls, indicating that NaHS reduced Cd movement from the roots to upper-plant parts. Exogenous NaHS also significantly increased the content of pectin and the activity of pectin methylesterase in cell walls of roots, thereby increasing Cd retention in pectin fractions. However, intensification of H
2
S barely affected hemicellulose content under Cd stress. Intensified H
2
S signal, therefore, alleviates Cd toxicity in Brassica napus by increasing pectin content and its demethylation, increasing Cd fixation in cell walls, and reducing root-to-shoot Cd translocation.
...
PMID:Sodium Hydrosulfide Mitigates Cadmium Toxicity by Promoting Cadmium Retention and Inhibiting Its Translocation from Roots to Shoots in Brassica napus. 3056 99
