What is the fate of xylem-transported CO2 in Kranz-type C4 plants?
© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.
| Veröffentlicht in: | The New phytologist. - 1979. - 223(2019), 3 vom: 30. Aug., Seite 1241-1252 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2019
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Amaranthus hypochondriacus C4 photosynthesis CO2 efflux Kranz anatomy internally transported CO2 tunable diode laser absorption spectroscopy xylem-transported CO2 mehr... |
| Zusammenfassung: | © 2019 The Authors. New Phytologist © 2019 New Phytologist Trust. High concentrations of dissolved inorganic carbon in stems of herbaceous and woody C3 plants exit leaves in the dark. In the light, C3 species use a small portion of xylem-transported CO2 for leaf photosynthesis. However, it is not known if xylem-transported CO2 will exit leaves in the dark or be used for photosynthesis in the light in Kranz-type C4 plants. Cut leaves of Amaranthus hypochondriacus were placed in one of three solutions of [NaH13 CO3 ] dissolved in KCl water to measure the efflux of xylem-transported CO2 exiting the leaf in the dark or rates of assimilation of xylem-transported CO2 * in the light, in real-time, using a tunable diode laser absorption spectroscope. In the dark, the efflux of xylem-transported CO2 increased with increasing rates of transpiration and [13 CO2 *]; however, rates of 13 Cefflux in A. hypochondriacus were lower compared to C3 species. In the light, A. hypochondriacus fixed nearly 75% of the xylem-transported CO2 supplied to the leaf. Kranz anatomy and biochemistry likely influence the efflux of xylem-transported CO2 out of cut leaves of A. hypochondriacus in the dark, as well as the use of xylem-transported CO2 * for photosynthesis in the light. Thus increasing the carbon use efficiency of Kranz-type C4 species over C3 species |
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| Beschreibung: | Date Completed 28.02.2020 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/nph.15908 |