Leaf Gas Exchange, Dry Matter Partitioning, and Mineral Element Concentrations in Mango as Influenced by Elevated Atmospheric Carbon Dioxide and Root Restriction
The effects of atmospheric CO 2 enrichment and root restriction on net CO 2 assimilation ( A ), dry mass partitioning, and leaf mineral element concentrations in `Kensington' and `Tommy Atkins' mango ( Mangifera indica L.) were investigated. Trees were grown in controlled-environment glass...
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Veröffentlicht in: | Journal of the American Society for Horticultural Science 1997-11, Vol.122 (6), p.849-855 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The effects of atmospheric CO
2
enrichment and root restriction on net CO
2
assimilation (
A
), dry mass partitioning, and leaf mineral element concentrations in `Kensington' and `Tommy Atkins' mango (
Mangifera indica
L.) were investigated. Trees were grown in controlled-environment glasshouse rooms at ambient CO
2
concentrations of 350 or 700 μmol·mol
-1
. At each CO
2
concentration, trees were grown in 8-L containers, which restricted root growth, or grown aeroponically in 200-L root mist chambers, which did not restrict root growth. Trees grown in 350 μmol·mol
-1
CO
2
were more efficient at assimilating CO
2
than trees grown in 700 μmol·mol
-1
CO
2
. However, total plant and organ dry mass was generally higher for plants grown at 700 μmol·mol
-1
CO
2
due to increased
A
as a result of a greater internal partial pressure of CO
2
(
Ci
) in leaves of plants in the CO
2
enriched environment. Root restriction reduced
A
resulting in decreased organ and plant dry mass. In root-restricted plants, reduced
A
and dry matter accumulation offset the increases in these variables resulting from atmospheric CO
2
enrichment. Atmospheric CO
2
enrichment and root restriction did not affect dry mass partitioning. Leaf mineral element concentrations were generally lower for trees grown at the higher ambient CO
2
concentration, presumably due to a dilution effect from an increased growth rate. |
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ISSN: | 0003-1062 2327-9788 |
DOI: | 10.21273/JASHS.122.6.849 |