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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.

journal of the american society for horticultural science

Leaf Gas Exchange, Dry Matter Partitioning, and Mineral Element Concentrations in Mango as Influenced by Elevated Atmospheric Carbon Dioxide and Root Restriction