Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
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Gene/Protein
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Target Concepts:
Gene/Protein
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Query: EC:1.6.3.1 (
NADPH oxidase
)
11,281
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Abscisic acid (ABA) regulates the plant's adaptive responses to abiotic stresses. Over-expression of the
9-cis-epoxycarotenoid dioxygenase
gene (SgNCED1) in the transgenic tobaccos increased ABA content and tolerance to drought and salt stresses. H2O2 and nitric oxide (NO) contents were enhanced in guard cells and mesophyll cells of the transgenic plants, accompanied with increased transcripts and activities of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR). The enhancements of H2O2 and NO and transcripts and activities of antioxidant enzymes in the transgenic plants were blocked by pre-treatments with inhibitor of ABA biosynthesis, scavengers of H2O2 and NO, and inhibitors of
NADPH oxidase
and NO synthase-like (NOS-like). The elevated production of NO in the transgenic plants was blocked by scavenger of H2O2 and inhibitors of
NADPH oxidase
, whereas H2O2 level was not affected by scavenger of NO and inhibitor of NOS-like, indicating that H2O2 is essential for the elevated production of NO. The results demonstrate that the increased drought and salt tolerance in the transgenic plants is associated with ABA-induced production of H2O2 via
NADPH oxidase
and NO via NOS-like, which sequentially induce transcripts and activities of SOD, CAT, APX and GR.
...
PMID:Increased abscisic acid levels in transgenic tobacco over-expressing 9 cis-epoxycarotenoid dioxygenase influence H2O2 and NO production and antioxidant defences. 1918 89
Drought is one of the major stress factors in wheat production on a global scale. Drought priming during the early growth stage can enhance drought tolerance in wheat (Triticum aestivum L.). Abscisic acid (ABA) and hydrogen peroxide (H
2
O
2
) are important signal molecules in the adaptation of plants to drought stress. However, the roles of ABA and H
2
O
2
in drought priming-induced drought tolerance are not clear. In the present study, we evaluated the responses of wheat to an ABA inhibitor, H
2
O
2
scavenger and an inhibitor to investigate the (i) relationship between ABA and H
2
O
2
in osmotic adjustment after drought priming in the vegetative stage and (ii) responses to drought stress during grain filling. In the drought priming alone treatments, chemical application resulted in the scavenging of ABA and H
2
O
2
, weakening the alleviation effects of drought priming on drought stress, as demonstrated by the lower leaf water potential and grain yield. The ABA inhibitor completely inhibited accumulation of ABA and H
2
O
2
; the ABA inhibitor inhibited respiratory burst oxidase homologue expression, whereas the H
2
O
2
inhibitor resulted in higher
9-cis-epoxycarotenoid dioxygenase
expression and ABA concentration in primed plants, indicating that ABA scavenging inhibited H
2
O
2
biosynthesis while H
2
O
2
scavenging did not inhibit ABA biosynthesis. The results further demonstrated that
NADPH oxidase
-mediated H
2
O
2
production functions downstream of ABA, which induces osmolyte transcript expression and accumulation, and thus contributes to drought priming-induced stress tolerance. These results provide a theoretical basis for a better understanding of the mechanisms involved in drought priming-induced tolerance in wheat plants.
...
PMID:Abscisic acid and hydrogen peroxide are involved in drought priming-induced drought tolerance in wheat (Triticum aestivum L.). 3253 May 58
