Abstract
Earlier it was noticed that the supplementary nitrogen to nutritive solution of the cadmium stressed (Cd-stressed) plants can alleviate the toxic effects of this metal on the plants and improve plant growth performance. But the underlying mechanisms of such detoxification effect of nitrogen were not studied. In this study, a ten-day responses of related nitrogen-synthesized genes including γ-glutamylcysteine synthetase (γ-GCs), glutathione synthetase (ECGs) and phytochelatin synthase (PCs) involved in glutathione (ECG) and phytochelation (PC) synthetic pathways were examined. The plant growth performance and leaf chlorophyll content were examined at the final harvest. It was shown that the supplement of additional nitrogen to poplar plants under cadmium stress could significantly up-regulate the expression levels of γ-GCs, ECGs and PCs genes in plant leaves during the first 12 hours. Furthermore, cadmium stressed plants with additional nitrogen supplement showed significant enhancement in growth performance and increase in leaf chlorophyll content compared to sole cadmium stressed plants. Our results suggest that additional nitrogen could stimulate a short-term defense system in poplar plants through ECG and PC synthetic pathways. It is contribute to the alleviation of the toxic symptoms in polar plants caused by cadmium stress. This study provides a potential method to render harmless cadmium toxicity in stressed plants with nitrogen fertilization.
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Claims 4
Claim · model-written summary
Additional nitrogen significantly up-regulated expression of the γ-GCs, ECGs and PCs genes in poplar leaves under cadmium stress during the first 12 hours.
- Treatment
- additional nitrogene1
- Gene
- γ-GCs, ECGs and PCse1
- Outcome
- expression levels of γ-GCs, ECGs and PCs genese1
- Direction
- up-regulatee1
- Qualifier
- during the first 12 hourse1
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplar leaves”
e1“the supplement of additional nitrogen to poplar plants under cadmium stress could significantly up-regulate the expression levels of γ-GCs, ECGs and PCs genes in plant leaves during the first 12 hours”
Claim · model-written summary
Additional nitrogen supplement significantly enhanced growth performance of cadmium-stressed poplar compared with cadmium stress alone.
- Treatment
- additional nitrogen supplemente2
- Outcome
- growth performancee2
- Direction
- enhancemente2
- Comparator
- sole cadmium stressed plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplar leaves”
e2“cadmium stressed plants with additional nitrogen supplement showed significant enhancement in growth performance and increase in leaf chlorophyll content compared to sole cadmium stressed plants”
Claim · model-written summary
Additional nitrogen supplement significantly increased leaf chlorophyll content of cadmium-stressed poplar compared with cadmium stress alone.
- Treatment
- additional nitrogen supplemente2
- Outcome
- leaf chlorophyll contente2
- Direction
- increasee2
- Comparator
- sole cadmium stressed plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in poplar leaves”
e2“cadmium stressed plants with additional nitrogen supplement showed significant enhancement in growth performance and increase in leaf chlorophyll content compared to sole cadmium stressed plants”
Claim · model-written summary
Additional nitrogen may stimulate a short-term defense system in poplar through the ECG and PC synthetic pathways.
- Treatment
- additional nitrogene3
- Outcome
- short-term defense systeme3
- Qualifier
- through ECG and PC synthetic pathwayse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“additional nitrogen could stimulate a short-term defense system in poplar plants through ECG and PC synthetic pathways”
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