Proton release from tea plant (Camellia sinensis L.) roots induced by Al(III) under hydroponic conditions

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Contents Vol 50(6)

doi:10.1071/SR12099

Soil, Land Care & Environmental Research

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Proton release from tea plant (Camellia sinensis L.) roots induced by Al(III) under hydroponic conditions

Qing Wan ^A ^B, Ren-kou Xu ^A ^C and Xing-hui Li ^B ^C

^A State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, PO Box 821, Nanjing, China.
^B Tea Science Research Institute, Nanjing Agriculture University, Nanjing 210095, China.
^C Corresponding author. Email: rkxu@issas.ac.cn; lxh@njau.edu.cn

Soil Research 50(6) 482-488 http://dx.doi.org/10.1071/SR12099
Submitted: 1 March 2012 Accepted: 21 August 2012 Published: 25 September 2012





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Abstract

The mechanisms for soil acidification induced by tea plant growth are not well understood. Proton release from tea plant (Camellia sinensis L.) roots induced by aluminium (Al(III)) in solution-culture experiments was examined with an automatic titration system, to determine the effect of Al(III) uptake by the plants on soil acidification. Results indicated that the uptake of Al(III) by tea plants led to proton release from their roots and thus an increase in soil acidification. The uptake of Al(III) by tea plants and the amount of protons released from the roots were greater at pH 4.5 than at pH 5.0 and 4.0 and increased with increasing initial Al(III) concentration in the culture solutions. With the same initial pH, the amount of protons released from tea plant roots at a constant pH was much higher than that at non-constant pH. The presence of ammonium increased the amount of protons released from tea plant roots. Therefore, the uptake of Al by tea plants and subsequent release of protons from their roots may be an important mechanism by which they acidify soils in tea gardens.

Additional keywords: acidification, aluminum, tea plant, proton release.

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