Longitudinal variation in cadmium influx in intact first order lateral roots of sunflower (Helianthus annuus. L)
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Contamination of sunflower (Helianthus annuus L.) by cadmium (Cd) is a concern for food and feed safety as this species accumulates Cd to a greater extent than other crops. We examined the relationships between root architecture and Cd2+ uptake by roots.
We determined and mathematically modelled the longitudinal variation of Cd2+ influx in first order roots of sunflower grown in hydroponics by using short-term exposure to 109Cd-labelled solutions (0.8 to 500 nM). Thereafter, by taking into account the longitudinal variation of the influx, we simulated the uptake of Cd2+ for 24 h by cohorts of roots characterised by various architectural characteristics.
Cd2+ influx at the root tip was on average 2.9 times that of the basal region close to the taproot. The simulations indicated that the total Cd2+ uptake by root cohorts mainly depends on 1/ the root diameter and the number of roots, 2/ the value of the Cd2+ influx at the basal region 3/ the stronger influx at the root tip.
Considering a higher Cd2+ influx at the root tip may be important to understand the relationship between root architecture and Cd2+ uptake by the root system.
KeywordsCadmium Influx Longitudinal variation Root architecture Sunflower
This work was supported by the funding ANR 2011 CESA 008 01 and by a research grant from the Technical Center for Oilseed Crops and Industrial Hemp (CETIOM) and from the French National Institute for Agricultural Research (INRA). The authors are grateful to S. Bussière, C. Coriou and S. Thunot for their helpful technical contribution.
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