Lead accumulation and its translocation barriers in roots ofAllium cepa L.—autoradiographic and ultrastructural studies
作者:
M. WIERZBICKA,
期刊:
Plant, Cell&Environment
(WILEY Available online 1987)
卷期:
Volume 10,
issue 1
页码: 17-26
ISSN:0140-7791
年代: 1987
DOI:10.1111/j.1365-3040.1987.tb02075.x
出版商: Blackwell Publishing Ltd
关键词: Allium cepa L.;apoplastic lead transport;lead localization;quiescent centre;root tip ultrastructure;symplastic lead transport
数据来源: WILEY
摘要:
AbstractLead migrating through the tissues ofAllium cepaL. was found, by electron microscopy, autoradiography and other methods, to encounter at least three barriers to penetration. The layers of protoderm and hypodermic meristematic cells in the root meristematic zone and the layer of endodermis in the mature root zone were barriers to apoplastic transport. The central zone was a barrier to apoplastic and symplastic transport. It comprises the quiescent centre in the root meristem and the central part of the root cap. The cells of the deepest ground meristematic tissue layers seemed to act as a barrier, which keeps lead away from the procambium. Lead accumulated in roots but it was not uniformly distributed between their various tissues. The largest amount of lead accumulated both in ground meristematic and cortex tissues.
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