Photosynthetica 1997, 33(2):269 | DOI: 10.1023/A:1022172515878

Effect of fruiting and drought or flooding on carbon balance of apple trees

M.L. Wibbe1, M.M. Blanke1
1 Institut für Obstbau und Gemüsebau, Bonn, Germany

The response of fruiting or deblossomed trees to water stress such as drought or flooding was investigated in six semi open-top cuvettes each containing one apple (Malus domestica Borkh. cv. Golden Delicious) tree. Xylem water potentials of leaves dropped from -1.2 to -4.1 MPa within 7 d of drought, the effect being enhanced by fruiting. Apple trees without fruits showed smaller reductions in net photosynthetic rate (P N ) and dark respiration rate (R D ) after 2 d of drought and hence more positive carbon balances relative to fruiting trees. Flooding for 4 d had a more pronounced effect on P N than on transpiration, resulting in a reduced water use efficiency (WUE). This reduction in WUE was greater in the non-fruiting trees. Flooding reduced P N of the whole apple canopies irrespective of fruiting; aple trees without fruits increased R D resulting in a less positive carbon balance relative to fruiting trees. Fruiting increased the sensitivity to drought of apple trees (R D and P N ), but decreased their sensitivity to flooding (R D and WUE), suggesting different adaptation mechanisms for the two forms of water stress.

Additional key words: Malus domestica; open-top cuvettes; photosynthesis; respiration; water stress; water use efficiency; xylem water potential

Published: March 1, 1997  Show citation

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Wibbe, M.L., & Blanke, M.M. (1997). Effect of fruiting and drought or flooding on carbon balance of apple trees. Photosynthetica, 33(2), 269. doi: 10.1023/A:1022172515878
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