Light regulation of root and leaf NO3 - uptake and reduction in the floating macrophyte Lemna minor
• The regulation of NO3 - uptake kinetics and reduction in relation to long- and short-term changes in irradiance was explored in roots and photosynthetic tissues of Lemna minor. • The NO3 - uptake kinetics, nitrate reductase activity, plant morphology, chlorophyll and tissue NO3 - , organic-N, st...
| Veröffentlicht in: | The New phytologist. - 1984. - 161(2004), 2 vom: 25. Feb., Seite 449-457 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2004
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Lemna minor acclimatization allocation floating macrophyte irradiance nitrate reductase activity nitrate uptake root vs shoot uptake |
| Zusammenfassung: | • The regulation of NO3 - uptake kinetics and reduction in relation to long- and short-term changes in irradiance was explored in roots and photosynthetic tissues of Lemna minor. • The NO3 - uptake kinetics, nitrate reductase activity, plant morphology, chlorophyll and tissue NO3 - , organic-N, starch and sugars were measured on roots and fronds of L. minor grown at four combinations of irradiance- and NO3 - availability. • Long-term acclimatizations paralleled those of terrestrial plants. Short-term changes in irradiance, however, changed frond NO3 - uptake proportionally with frond chlorophyll and N content, indicating a relationship between responsiveness and the metabolic potential of the plants. Root uptake changed to balance the change in frond uptake keeping whole plant uptake varying by < 40%. Nitrate reductase activity was primarily located in the roots and was correlated with frond uptake, indicating a transport of NO3 - from shoot to root before reduction. • This study shows that irradiance can affect the contribution of root and leaf uptake by aquatic plants and that roots play a major role in NO3 - reduction despite large foliar uptake |
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| Beschreibung: | Date Revised 20.04.2021 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1046/j.1469-8137.2003.00936.x |