Nitrogen management and senescence in two maize hybrids differing in the persistence of leaf greenness : agronomic, physiological and molecular aspects
Copyright New Phytologist (2005).
| Veröffentlicht in: | The New phytologist. - 1979. - 167(2005), 2 vom: 13. Aug., Seite 483-92 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2005
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Comparative Study Journal Article Plant Proteins RNA, Plant Nitrogen N762921K75 |
| Zusammenfassung: | Copyright New Phytologist (2005). Here, nitrogen management within the plant was compared in an early-senescing maize hybrid and in a late-senescing maize hybrid, both grown under field conditions with a high fertilisation input involving large quantities of fertiliser. We monitored, in representative leaf stages, the changes in metabolite content, enzyme activities and steady-state levels of transcripts for marker genes of N primary assimilation, N recycling and leaf senescence. The hybrids differed in terms of persistence of leaf greenness, the expression of marker genes and the concentration of enzymes used to describe the transition from N assimilation to N recycling. The transcription of leaf-senescence marker genes did not differ. Agronomic studies confirmed the ability of the late-senescing hybrid to absorb and store more N in shoots. Despite the differences in the mode of N management adopted by the two hybrids, we conclude that leaf senescence occurs independently of the source-to-sink transition at the high level of fertilisation used involving large quantities of fertiliser. The possibility of improving N metabolic efficiency in the latest maize hybrids is discussed |
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| Beschreibung: | Date Completed 29.09.2005 Date Revised 30.09.2020 published: Print Citation Status MEDLINE |
| ISSN: | 1469-8137 |