Genetic analysis of cadmium accumulation in lettuce (Lactuca sativa)

ZORRIG, Walid; CORNU, Jean-Yves; MAISONNEUVE, Brigitte; ROUACHED, Aida; SARROBERT, Catherine; SHAHZAD, Zaigham; ABDELLY, Chedly; DAVIDIAN, Jean-Claude; BERTHOMIEU, Pierre

doi:10.1016/j.plaphy.2019.01.011

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ZORRIG, Walid
Biochimie et Physiologie Moléculaire des Plantes [BPMP]
Centre de Biotechnologie de Borj-Cédria
Biochimie et Physiologie Moléculaire des Plantes [BPMP]

CORNU, Jean-Yves
Interactions Sol Plante Atmosphère [UMR ISPA]

MAISONNEUVE, Brigitte
Génétique et Amélioration des Fruits et Légumes [GAFL]

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Ce document a été publié dans

Plant Physiology and Biochemistry. 2019, vol. 136, p. 67-75

Elsevier

Résumé en anglais

This work characterized mechanisms controlling cadmium (Cd) tolerance and accumulation in lettuce at both the physiological and genetic levels. These traits were evaluated in 18 Lactuca accessions representing a large genetic diversity. Cd tolerance and accumulation in roots and shoots as well as Cd translocation from roots to the shoot varied independently, and with a significant range of variation. Analyses of F1 progenies of crosses between cultivars with contrasted phenotypes showed that high tolerance to Cd, low Cd accumulation and low Cd root-shoot translocation were recessive traits. Results of analyses of F2 progenies of different crosses suggest that root Cd concentration and root-shoot Cd translocation were under a complex genetic determinism involving at least two loci. This work thus revealed that limiting both Cd accumulation and Cd root-shoot translocation in lettuce is possible and depends on recessive loci. Differences in the ability to accumulate Cd in roots in the long term could not be linked to differences in short-term 109Cd uptake into, or efflux from, roots. In contrast, the cultivar with the highest root-shoot Cd translocation was the same in the long term and in the short term, which suggests that this trait relies on processes that are implemented quickly (i.e. in less than three days) after the start of Cd exposure.< Réduire

Mots clés

accumulation du cadmium

racine

laitue

tolérance aux metaux

Mots clés en anglais

Cadmium tolerance

Genotype

lettuce

root

Cadmium accumulation

Diversity analysis

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