Abstract
Aims
This work concentrated on understanding the allocation of Cd recently taken up between the organs of sunflower at early and middle reproductive growth stages. The roles of transpiration and allometry were investigated.
Methods
Sunflowers were grown hydroponically in greenhouse, being exposed to low concentrations of Cd (pCd2+ = 11.03). At flower bud and grain filling stages, plants were exposed for three days to 111Cd and at the same time, subjected or not to fans to increase the transpiration. The partitioning of 111Cd between plant organs measured by high resolution ICP-MS was then modelled.
Results
Although the use of fans increased the plant water uptake and transpiration by about 20%, there were no significant effects on the partitioning of recent Cd. Most of the recent Cd was recovered in roots (60%) and only 2.8% were found in seeds (0.8% for the husk and 2.0% for the almonds). The sequestration of recent Cd in a plant organ was successfully explained by its biomass and except for leaves, by the biomass of other organs acting as competitive sinks.
Conclusions
This work proposes a modelling approach for the partitioning of the labelled Cd between plant organs in sunflower.
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Acknowledgments
This work has been financially supported by the French National Research Agency through the SIM-TRACES (ANR-11-CESA-0008) Project.
O. Liñero is grateful to the University of the Basque Country (UPV/EHU) and the University of Bordeaux for her predoctoral fellowship, within the framework of the Cross-Border Euroregional Campus of International Excellence IdEx Bordeaux – Euskampus. O.S. Pokrovsky thanks partial support of BIO-GEO-CLIM grant No 14.B25.31.0001. The authors are grateful to L. Champolivier (Terres Inovia) for his helpful advices about the pollination and seed development of sunflower under controlled conditions.
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Electronic Supplementary Material
Online Resource 1
Observed 114Cd/111Cd ratios against theoretical ones. The slope (p < 0.001) and the intercept (p < 0.05) values of the regression line do not significantly differ from 1 and 0, respectively. (PDF 69 kb)
Online Resource 2
The best regression models selected for explaining the partitioning of labelled Cd in each plant organ, following Eq. 4 and 5 of the materials and methods (AG = aboveground organs). E i indicates the amount of labelled Cd exported by the previous plant organ, according to the general flow chart of labelled Cd described in Fig. 1. The significance of the intercept is coded as * p < 0.05, ** p < 0.01, *** p < 0.001. (PDF 118 kb)
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Liñero, O., Cornu, JY., Candaudap, F. et al. Short-term partitioning of Cd recently taken up between sunflowers organs (Helianthus annuus) at flowering and grain filling stages: effect of plant transpiration and allometry. Plant Soil 408, 163–181 (2016). https://doi.org/10.1007/s11104-016-2915-0
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DOI: https://doi.org/10.1007/s11104-016-2915-0