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: EC:1.7.1.2 (
nitrate reductase
)
3,861
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
This study examines the association of auxin with ethylene and nitric oxide (NO) in regulating the magnesium (Mg) deficiency-induced root hair development in Arabidopsis thaliana. With Mg deficiency, both ethylene and NO promoted the elevation of root auxin levels in roots by inducing the expression of AUXIN-RESISTANT1 (AUX1),
PIN
-FORMED 1 (PIN1) and PIN2 transporters. In turn, auxin stimulated ethylene and NO production by activating the activities of 1-aminocyclopropane-1-carboxylate (ACC) oxidase (ACO), ACC synthase (ACS),
nitrate reductase
(NR) and NO synthase-like (NOS-L). These processes constituted an NO/ethylene-auxin feedback loop. Interestingly, however, the roles of ethylene and NO in regulating Mg deficiency-induced root hair development required the action of auxin, but not vice versa. In summary, these results suggest that Mg deficiency induces a positive interaction between the accumulation of auxin and ethylene/NO in roots, with auxin acting downstream of ethylene and NO signals to regulate Mg deficiency-induced root hair morphogenesis.
...
PMID:Auxin Acts Downstream of Ethylene and Nitric Oxide to Regulate Magnesium Deficiency-Induced Root Hair Development in Arabidopsis thaliana. 2966 31
Nitrogen (N) is a major essential nutrient for plant growth, and rice is an important food crop globally. Although ammonium (NH
4
+
) is the main N source for rice, nitrate (NO
3
-
) is also absorbed and utilized. Rice responds to NO
3
-
supply by changing root morphology. However, the mechanisms of rice root growth and formation under NO
3
-
supply are unclear. Nitric oxide (NO) and auxin are important regulators of root growth and development under NO
3
-
supply. How the interactions between NO and auxin in regulating root growth in response to NO
3
-
are unknown. In this study, the levels of indole-3-acetic acid (IAA) and NO in roots, and the responses of lateral roots (LRs) and seminal roots (SRs) to NH
4
+
and NO
3
-
, were investigated using wild-type (WT) rice, as well as
osnia2
and
ospin1b
mutants. NO
3
-
supply promoted LR formation and SR elongation. The effects of NO donor and NO inhibitor/scavenger supply on NO levels and the root morphology of WT and
nia2
mutants under NH
4
+
or NO
3
-
suggest that NO
3
-
-induced NO is generated by the
nitrate reductase
(NR) pathway rather than the NO synthase (NOS)-like pathway. IAA levels, [
3
H] IAA transport, and
PIN
gene expression in roots were enhanced under NO
3
-
relative to NH
4
+
supply. These results suggest that NO
3
-
regulates auxin transport in roots. Application of SNP under NH
4
+
supply, or of cPTIO under NO
3
-
supply, resulted in auxin levels in roots similar to those under NO
3
-
and NH
4
+
supply, respectively. Compared to WT, the roots of the
ospin1b
mutant had lower auxin levels, fewer LRs, and shorter SRs. Thus, NO affects root growth by regulating auxin transport in response to NO
3
-
. Overall, our findings suggest that NO
3
-
influences LR formation and SR elongation by regulating auxin transport via a mechanism involving NO.
...
PMID:Nitric Oxide Affects Rice Root Growth by Regulating Auxin Transport Under Nitrate Supply. 3157 20
