A Cosegregation Analysis of Zinc (Zn) Accumulation and Zn Tolerance in the Zn Hyperaccumulator Thlaspi caerulescens

• To analyse the relation between zinc (Zn) accumulation and Zn tolerance in the Zn hyperaccumulator, Thlaspi caerulescens, a cross was made between a plant from a nonmetallicolous population (LE: high accumulation, low tolerance) and one from a calamine population (LC: low accumulation, high tolera...

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Published inThe New phytologist Vol. 159; no. 2; pp. 383 - 390
Main Authors Ana G. L. Assunção, Wilma M. Ten Bookum, Hans J. M. Nelissen, Vooijs, Riet, Schat, Henk, Wilfried H. O. Ernst
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Science 01.08.2003
Blackwell Publishing Ltd
Subjects
cosegregation
genetics
heavy metal tolerance
hyperaccumulation
Hyperaccumulators
Hypochromic anemia
Nutrient solutions
Parents
Phenotypes
Phenotypic traits
Plants
Population growth
Segregation
Thlaspi caerulescens
Zinc
Thlaspi caerulescens
genetics
heavy metal tolerance
Zn
hyperaccumulation
cosegregation
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Summary:• To analyse the relation between zinc (Zn) accumulation and Zn tolerance in the Zn hyperaccumulator, Thlaspi caerulescens, a cross was made between a plant from a nonmetallicolous population (LE: high accumulation, low tolerance) and one from a calamine population (LC: low accumulation, high tolerance). • More or less homogeneous F3 lines with contrasting extreme accumulation phenotypes were selected and phenotyped for tolerance, using the threshold exposure level for chlorosis as a tolerance measure. Zn accumulation and tolerance segregated largely independently, although there was a significant degree of association between low accumulation and high tolerance. • Plants from an F2 family were phenotyped for Zn tolerance and their Zn accumulation rates were compared. The plants with low Zn tolerance exhibited significantly higher Zn accumulation than did the more tolerant plants. • The results suggest that the superior Zn tolerance in LC plants compared with LE plants results from a superior plant-internal Zn sequestration capacity and, although to a lower degree, a reduced rate of Zn accumulation. It is argued that the relatively low Zn accumulation capacity levels found in LC and several other calamine T. caerulescens populations might represent an adaptive response to Zn-toxic soil.
ISSN:0028-646X
1469-8137
DOI:10.1046/j.1469-8137.2003.00758.x