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Annals of Botany 80: 747-751, 1997
© 1997 Annals of Botany Company

The Consequence of Selection for Copper Tolerance on the Uptake and Accumulation of Copper inMimulus guttatus

G. H. TILSTONE+, and M. R. MACNAIR§,

Department of Biological Sciences, Hatherly Laboratories, University of Exeter, Prince of Wales Road, EX4 4PS, Exeter, U.K.

June 4, 1997 ; August 4, 1997 .

Previous research has shown that copper tolerance inMimulus guttatusFischer ex DC. is controlled by a single major gene and can be enhanced by a number of minor genes (or modifiers). Here we report the uptake of copper by three lines which all possessed the major tolerance gene but differed in the modifier genes: the major gene only (IT), the major gene plus increased (HT6) and decreased (LT6) modifiers. HT6 showed the highest copper tolerance and IT the lowest. Copper uptake was investigated at five copper concentrations and over 30 d to analyse the concentration of copper accumulated in roots and shoots and the partitioning of apoplastic and symplastic root copper. Significant differences were found for root copper concentration with the IT line accumulating the highest levels. Fifty-two per cent of the root copper in the IT line is symplastic and this increases to 60% in LT6 and 64% in HT6. Significant differences were recorded for shoot copper concentration with HT6 accumulating the highest and IT the lowest. At the highest external copper concentration the HT line accumulated nearly 800 µg g-1in its shoot, approaching levels reported for copper hyperaccumulation.Copyright 1997 Annals of Botany Company

Copper tolerance; copper uptake; copper minor genes; Mimulus guttatus


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