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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.2
- 수록면
- 47 - 56 (10page)
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High-affinity ammonium uptake in maize roots is mainly mediated by AMT1-type ammonium transporters ZmAMT1;1a and ZmAMT1;3, but whether the increased expression of ZmAMTs genes is able to enhance ammonium uptake capacity and subsequently improves overall nitrogen use efficiency remains to be elucidated. In this work, ZmAMT1;1a-overexpression transgenic maize plants were generated with the elevated levels of transcripts and proteins, and phenotypically analyzed together with wild-type plants grown in nutrient solution under two regimes of ammonium supply. Under low ammonium nutrition (0.04 mM), in relative to wild-type plants, the maize transgenic lines showed an approximately 17% increases in the high-affinity ammonium uptake capacity of roots as revealed by 15N-labeled ammonium influx assay and further contributed to about 7% increases in the total nitrogen uptake at the whole plant level. By contrast, when ammonium was supplied in high amounts (1 mM), wild-type plants expressed higher levels of ZmAMT1;1a, but exhibited a lower ammonium uptake capacity in roots. Furthermore, the transgenic maize line accumulated more amounts of ZmAMT1;1a protein, but did not translate into an enhanced ammonium acquisition, suggesting a possible post-translational down-regulation of ZmAMT1;1a by high ammonium. This study proved the possibility to enhance ammonium acquisition by elevating ZmAMTs expression in maize roots and provided an effective transgenic approach on developing high nitrogen use efficient maize cultivars.
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참고문헌 (41)
참고문헌 신청
An X / 2014 / Transcriptional regulation of expression of the maize aldehyde dehydrogenase 7 gene (ZmALDH7B6) in Response to abiotic stresses / J Integr Agric 13:1900~1908
Bao A / 2015 / Overexpressing of OsAMT1-3, a high affinity ammonium transporter gene, modifies rice growth and carbon-nitrogen metabolic status / Int J Mol Sci 16:9037~9063
Bloom AJ / 2002 / Root development and absorption of ammonium and nitrate from the rhizosphere / J Plant Growth Regul 21:416~431
Ciampitti IA / 2012 / Physiological perspectives of changes over time in maize yield dependency on nitrogen uptake and associated nitrogen efficiencies: a review / Field Crops Res 133:48~67
Coskun D / 2017 / Nitrogen transformations in modern agriculture and the role of biological nitrification inhibition / Nat Plants 3:17074
Bao A / 2015 / Overexpressing of OsAMT1-3, a high affinity ammonium transporter gene, modifies rice growth and carbon-nitrogen metabolic status / Int J Mol Sci 16:9037~9063
Bloom AJ / 2002 / Root development and absorption of ammonium and nitrate from the rhizosphere / J Plant Growth Regul 21:416~431
Ciampitti IA / 2012 / Physiological perspectives of changes over time in maize yield dependency on nitrogen uptake and associated nitrogen efficiencies: a review / Field Crops Res 133:48~67
Coskun D / 2017 / Nitrogen transformations in modern agriculture and the role of biological nitrification inhibition / Nat Plants 3:17074
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