Histidine promotes the loading of nickel and zinc, but not of cadmium, into the xylem in Noccaea caerulescens

Histidine is known to be involved in Ni hyperaccumulation. Recently, histidine-dependent xylem loading of Ni and Zn has been demonstrated in the Zn/Ni/Cd hyperaccumulator, Noccaea caerulescens. Here we tested the hypothesis whether Cd xylem loading is histidine-dependent, too. In contrast to that of...

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Published inPlant signaling & behavior Vol. 9; no. 9; p. e29580
Main Authors Kozhevnikova, Anna D, Seregin, Ilya V, Verweij, Rudo, Schat, Henk
Format Journal Article
LanguageEnglish
Published United States Taylor & Francis 01.09.2014
Subjects
cadmium
histidine
hyperaccumulation
Noccaea caerulescens
xylem loading
cadmium
Noccaea caerulescens
hyperaccumulation
histidine
xylem loading
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Summary:Histidine is known to be involved in Ni hyperaccumulation. Recently, histidine-dependent xylem loading of Ni and Zn has been demonstrated in the Zn/Ni/Cd hyperaccumulator, Noccaea caerulescens. Here we tested the hypothesis whether Cd xylem loading is histidine-dependent, too. In contrast to that of Ni and Zn, the xylem loading of Cd was not affected by exogenous histidine. Histidine accumulation in root cells appears to facilitate the radial transport of Ni and Zn, but not Cd, across the roots. This may be due to the relatively high preference of Cd for coordination with sulfur over coordination with nitrogen, in comparison with Ni and Zn.
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ISSN:1559-2316
1559-2324
1559-2324
DOI:10.4161/psb.29580