Abstract
Increasing evidence shows that partial nitrate nutrition (PNN) can be attributed to improved plant growth and nitrogen-use efficiency (NUE) in rice. Nitric oxide (NO) is a signalling molecule involved in many physiological processes during plant development and nitrogen (N) assimilation. It remains unclear whether molecular NO improves NUE through PNN. Two rice cultivars (cvs Nanguang and Elio), with high and low NUE, respectively, were used in the analysis of NO production, nitrate reductase (NR) activity, lateral root (LR) density, and (15)N uptake under PNN, with or without NO production donor and inhibitors. PNN increased NO accumulation in cv. Nanguang possibly through the NIA2-dependent NR pathway. PNN-mediated NO increases contributed to LR initiation, (15)NH₄(+)/(15)NO₃(-) influx into the root, and levels of ammonium and nitrate transporters in cv. Nanguang but not cv. Elio. Further results revealed marked and specific induction of LR initiation and (15)NH₄(+)/(15)NO₃(-) influx into the roots of plants supplied with NH₄(+)+sodium nitroprusside (SNP) relative to those supplied with NH₄(+) alone, and considerable inhibition upon the application of cPTIO or tungstate (NR inhibitor) in addition to PNN, which is in agreement with the change in NO fluorescence in the two rice cultivars. The findings suggest that NO generated by the NR pathway plays a pivotal role in improving the N acquisition capacity by increasing LR initiation and the inorganic N uptake rate, which may represent a strategy for rice plants to adapt to a fluctuating nitrate supply and increase NUE.
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Claims 9
Claim · model-written summary
Partial nitrate nutrition increased NO accumulation in rice cultivar Nanguang, possibly via the NIA2-dependent nitrate reductase pathway.
- Taxon
- rice
Oryza sativat0 - Material
- cv. Nanguange1
- Treatment
- PNNe1
- Gene
- NIA2e1
- Outcome
- NO accumulatione1
- Direction
- increasede1
- Qualifier
- possiblye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“PNN increased NO accumulation in cv. Nanguang possibly through the NIA2-dependent NR pathway”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
PNN-mediated NO increased lateral root initiation in cultivar Nanguang.
- Taxon
- riceOryza sativat0
- Material
- cv. Nanguange3
- Treatment
- PNN-mediated NOe2
- Outcome
- LR initiatione2
- Direction
- increasese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“PNN-mediated NO increases contributed to LR initiation”
e3“levels of ammonium and nitrate transporters in cv. Nanguang but not cv. Elio”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
PNN-mediated NO increased ammonium and nitrate transporter levels in cultivar Nanguang.
- Taxon
- riceOryza sativat0
- Material
- cv. Nanguange3
- Treatment
- PNN-mediated NOe2
- Outcome
- levels of ammonium and nitrate transporterse3
- Direction
- increasese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“PNN-mediated NO increases contributed to LR initiation”
e3“levels of ammonium and nitrate transporters in cv. Nanguang but not cv. Elio”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
PNN-mediated NO had no such effect on ammonium and nitrate transporter levels in cultivar Elio.
- Taxon
- riceOryza sativat0
- Material
- cv. Elioe3
- Treatment
- PNN-mediated NOe2
- Outcome
- levels of ammonium and nitrate transporterse3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“PNN-mediated NO increases contributed to LR initiation”
e3“levels of ammonium and nitrate transporters in cv. Nanguang but not cv. Elio”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
NH4+ plus sodium nitroprusside markedly induced lateral root initiation relative to NH4+ alone in rice.
- Taxon
- riceOryza sativat0
- Treatment
- NH₄(+)+sodium nitroprusside (SNP)e5
- Outcome
- LR initiatione5
- Direction
- inductione5
- Comparator
- NH₄(+) alonee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Further results revealed marked and specific induction of LR initiation and (15)NH₄(+)/(15)NO₃(-) influx into the roots of plants supplied with NH₄(+)+sodium nitroprusside (SNP) relative to those supplied with NH₄(+) alone”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
NH4+ plus sodium nitroprusside markedly induced inorganic N influx into rice roots relative to NH4+ alone.
- Taxon
- riceOryza sativat0
- Treatment
- NH₄(+)+sodium nitroprusside (SNP)e5
- Outcome
- influx into the rootse5
- Direction
- inductione5
- Comparator
- NH₄(+) alonee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Further results revealed marked and specific induction of LR initiation and (15)NH₄(+)/(15)NO₃(-) influx into the roots of plants supplied with NH₄(+)+sodium nitroprusside (SNP) relative to those supplied with NH₄(+) alone”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
cPTIO considerably inhibited lateral root initiation when applied in addition to PNN.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Further results revealed marked and specific induction of LR initiation and (15)NH₄(+)/(15)NO₃(-) influx into the roots of plants supplied with NH₄(+)+sodium nitroprusside (SNP) relative to those supplied with NH₄(+) alone”
e6“considerable inhibition upon the application of cPTIO or tungstate (NR inhibitor) in addition to PNN”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
Tungstate, an NR inhibitor, considerably inhibited lateral root initiation when applied in addition to PNN.
- Taxon
- riceOryza sativat0
- Treatment
- tungstate (NR inhibitor)e6
- Outcome
- LR initiatione5
- Direction
- inhibitione6
- Comparator
- PNNe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Further results revealed marked and specific induction of LR initiation and (15)NH₄(+)/(15)NO₃(-) influx into the roots of plants supplied with NH₄(+)+sodium nitroprusside (SNP) relative to those supplied with NH₄(+) alone”
e6“considerable inhibition upon the application of cPTIO or tungstate (NR inhibitor) in addition to PNN”
t0“under partial nitrate nutrition in rice”
Claim · model-written summary
The authors suggest that NO generated by the NR pathway improves N acquisition capacity in rice by increasing lateral root initiation and inorganic N uptake.
- Taxon
- riceOryza sativat0
- Compound
- NOe7
- Outcome
- N acquisition capacitye7
- Qualifier
- generated by the NR pathwaye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The findings suggest that NO generated by the NR pathway plays a pivotal role in improving the N acquisition capacity by increasing LR initiation and the inorganic N uptake rate”
t0“under partial nitrate nutrition in rice”
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