Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: UNIPROT:P30044 (
antioxidant enzyme
)
8,037
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Drought and salinity are the most serious environmental factors affecting crop productivity worldwide; hence, it is important to select and develop both salt- and drought-tolerant crops. The perennial smooth cordgrass Spartina alterniflora Loisel is unusual in that it is highly salt-tolerant and seems to prefer
ammonium
(NH
4
+
) over nitrate (NO
3
-
) as an inorganic N source. In this study, we determined whether Spartina's unique preference for NH
4
+
enhances performance under salt and drought stress. Greenhouse experiments were conducted to compare the interactive effects of N source, salinity, and low water availability on plant performance (growth and antioxidant metabolism). Drought significantly reduced growth and photosynthetic activity in S. alterniflora, more so with NH
4
+
than NO
3
-
; in contrast, NH
4
+
enhanced growth under high salinity. The increased tolerance of S. alterniflora to salt stress in the presence of NH
4
+
was linked to a high level of
antioxidant enzyme
activity, combined with low MDA content, EL, and H
2
O
2
production. In contrast, drought stress negated the growth advantages for S. alterniflora exposed to salt stress in the presence of NH
4
+
. The susceptibility of S. alterniflora to drought was partly due to reduced
antioxidant enzyme
activities, thereby reducing the defense against the oxidative damages induced by osmotic stress. In conclusion, in contrast to salt stress, drought stress negates the beneficial effects of
ammonium
as an N source in the C
4
plant Spartina alterniflora.
...
PMID:Drought and salinity: A comparison of their effects on the ammonium-preferring species Spartina alterniflora. 3306 46
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