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@article{1373511,
author = {Tao, Qi and Jupa, Radek and Luo, Jipeng and Lux, Alexander and Kováč, Ján and Wen, Yue and Zhou, Yimei and Jan, Japenga and Liang, Yongchao and Li, Tingqiang},
article_location = {Oxford},
article_number = {3},
doi = {http://dx.doi.org/10.1093/jxb/erw453},
keywords = {Apoplasmic bypass; cadmium; hydraulic conductance; lateral roots; root apex; Sedum alfredii; suberin lamellae; trisodium-8-hydroxy-1-3-6-pyrenetrisulphonic acid (PTS)},
language = {eng},
issn = {0022-0957},
journal = {Journal of Experimental Botany},
title = {The apoplasmic pathway via the root apex and lateral roots contributes to Cd hyperaccumulation in the hyperaccumulator Sedum alfredii},
volume = {68},
year = {2017}
}
TY - JOUR
ID - 1373511
AU - Tao, Qi - Jupa, Radek - Luo, Jipeng - Lux, Alexander - Kováč, Ján - Wen, Yue - Zhou, Yimei - Jan, Japenga - Liang, Yongchao - Li, Tingqiang
PY - 2017
TI - The apoplasmic pathway via the root apex and lateral roots contributes to Cd hyperaccumulation in the hyperaccumulator Sedum alfredii
JF - Journal of Experimental Botany
VL - 68
IS - 3
SP - 739-751
EP - 739-751
PB - OXFORD UNIV PRESS
SN - 00220957
KW - Apoplasmic bypass
KW - cadmium
KW - hydraulic conductance
KW - lateral roots
KW - root apex
KW - Sedum alfredii
KW - suberin lamellae
KW - trisodium-8-hydroxy-1-3-6-pyrenetrisulphonic acid (PTS)
N2 - Although the significance of apoplasmic barriers in roots with regards to the uptake of toxic elements is generally known, the contribution of apoplasmic bypasses (ABs) to cadmium (Cd) hyperaccumulation is little understood. Here, we employed a combination of stable isotopic tracer techniques, an ABs tracer, hydraulic measurements, suberin lamellae staining, metabolic inhibitors, and antitranspirants to investigate and quantify the impact of the ABs on translocation of Cd to the xylem in roots of a hyperaccumulating (H) ecotype and a non-hyperaccumulating (NH) ecotype of Sedum alfredii. In the H ecotype, the Cd content in the xylem sap was proportional to hydrostatic pressure, which was attributed to pressure-driven flow via the ABs. The contribution of the ABs to Cd transportation to the xylem was dependent on the Cd concentration applied to the H ecotype (up to 37% at the highest concentration used). Cd-treated H ecotype roots showed significantly higher hydraulic conductance compared with the NH ecotype (76 vs 52 × 10–8 m s–1MPa–1), which is in accordance with less extensive suberization due to reduced expression of suberin-related genes. The main entry sites of apoplasmically transported Cd were localized in the root apexes and lateral roots of the H ecotype, where suberin lamellae were not well developed. These findings highlight the significance of the apoplasmic bypass in Cd hyperaccumulation in hyperaccumulating ecotypes of S. alfredii.
ER -
TAO, Qi, Radek JUPA, Jipeng LUO, Alexander LUX, Ján KOVÁČ, Yue WEN, Yimei ZHOU, Japenga JAN, Yongchao LIANG and Tingqiang LI. The apoplasmic pathway via the root apex and lateral roots contributes to Cd hyperaccumulation in the hyperaccumulator Sedum alfredii. \textit{Journal of Experimental Botany}. Oxford: OXFORD UNIV PRESS, 2017, vol.~68, No~3, p.~739-751. ISSN~0022-0957. Available from: https://dx.doi.org/10.1093/jxb/erw453.
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