Boron-aluminum interactions affect organic acid metabolism more in leaves than in roots of <Emphasis Type="Italic">Citrus grandis</Emphasis> seedlings |
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Authors: | N Tang H -X Jiang L -T Yang Q Li G -H Yang L -S Chen |
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Institution: | (1) Institute of Horticultural Plant Physiology, Biochemistry and Molecular Biology, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR, China;(2) College of Life Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR, China;(3) College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR, China;(4) Biotechnology Center, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR, China;(5) Fujian Key Laboratory for Plant Molecular and Cell Biology, Fujian Agriculture and Forestry University, Fuzhou, 350002, PR, China |
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Abstract: | Sour pummelo (Citrus grandis) seedlings were irrigated with nutrient solution containing four boron concentrations (i.e., 2.5, 10, 25 and 50 μM H3BO3) and two aluminum concentrations i.e., 0 (-Al) and 1.2 mM AlCl3 · 6 H2O (+Al)]. It was found that B did not affect, but Al increased, the Al content in the roots. The Al and citrate contents in
the -Al leaves either did not change or slightly increased with increasing B concentration. On the other hand, the Al and
citrate contents in the +Al leaves rapidly decreased as B concentration increased from 2.5 to 50 μM, then decreased at the
highest B concentration. The Al and citrate contents were higher in the +Al than in the -Al leaves, except for at 25 μM B
when they were similar. The leaf malate content did not change in response to B or Al, except for an increase in the +Al leaves
and a decrease in the -Al leaves at 2.5 μM B. Similarly, the root malate and citrate contents did not change in response to
B with or without Al, except for a decrease in the malate and citrate contents in the +Al roots at 50 μM B and an increase
in the citrate content in the -Al roots at 50 μM B. The activities of acid-metabolizing enzymes were less affected by B-Al
interactions in the roots than in the leaves. |
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