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Effects of atmospheric CO 2 enrichment and root restriction on leaf gas exchange and growth of banana ( Musa )
Author(s) -
Schaffer B.,
Searle C.,
Whiley A. W.,
Nissen R. J.
Publication year - 1996
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1996.tb00532.x
Subject(s) - horticulture , root (linguistics) , chemistry , environmental science , botany , biology , philosophy , linguistics
The effects of atmospheric CO 2 enrichment and root restriction on photosynthetic characteristics and growth of banana ( Musa sp. AAA cv. Gros Michel) plants were investigated. Plants were grown aeroponically in root chambers in controlled environment glasshouse rooms at CO 2 concentrations of 350 or 1 000 μmol CO 2 mol ‐1. At each CO 2 concentration, plants were grown in large (2001) root chambers that did not restrict root growth or in small (20 1) root chambers that restricted root growth. Plants grown at 350 μmol CO 2 mol ‐1 generally had a higher carboxylation efficiency than plants grown at 1 000 μmol CO 2 mol ‐1 although actual net CO 2 assimilation ( A ) was higher at the higher ambient CO 2 concentration due to increased intercellular CO 2 concentrations ( C i resulting from CO 2 enrichment. Thus, plants grown at 1 000 μmol CO 2 mol ‐1 accumulated more leaf area and dry weight than plants grown at 350 μmol CO 2 mol ‐1. Plants grown in the large root chambers were more photosynthetically efficient than plants grown in the small root chambers. At 350 μmol CO 2 mol ‐1 , leaf area and dry weights of plant organs were generally greater for plants in the large root chambers compared to those in the small root chambers. Atmospheric CO 2 enrichment may have compensated for the effects of root restriction on plant growth since at 1 000 μmol CO 2 mol ‐1 there was generally no effect of root chamber size on plant dry weight.