How phytohormone IAA and Chelator EDTA affect lead uptake by Zn/Cd hyperaccumulator Picris divaricata
2011
Du, Rui-Jun | He, Er-Kai | Tang, Ye-Tao | Hu, Peng-Jie | Ying, Rong-Rong | Morel, Jean-Louis | Qiu, Rong-Liang | Sch Environm Sci & Engn ; Sun Yat-sen University [Guangzhou] (SYSU) | Guangdong Institute of Eco-Environment and Soil Sciences | Laboratoire Sols et Environnement (LSE) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | National High Technology Research and Development Program (863 Program) of China [2007AA06Z305]; NSFC-Guangdong Joint Foundation of China [U0833004]; Guangdong Provincial Natural Science Foundation [06202438]; Fundamental Research Funds for the Central Universities
In this paper, the effects of indole-3-acetic acid (IAA) and/or ethylenediaminetetraacetic acid (EDTA) on lead uptake by a Zn/Cd hyperaccumulator Picris divaricata were studied. P. divaricata responded to Pb by better root system and increased biomass in presence of phytohormone IAA, which was able to reduce the inhibiting effects of Pb on transpiration without reducing the uptake of Pb The application of 100 mu M IAA increased plant transpiration rate by about 20% and Pb concentration in leaves by about 37.3% as compared to treatment exposed to Pb alone. The enhanced phytoextraction efficiency could be attributed to the mechanisms played by IAA through alleviating Pb toxicity, creating better root system and plant biomass, promoting a higher transpiration rate as well as regulating the level of nutrient elements. On the contrary, inefficiency of phytoextraction was found with EDTA or the combination of IAA and EDTA probably because most Pb was in the form of Pb-EDTA complex which blocked the uptake by P. divaricata. The present study demonstrated that IAA was able to enhance the phytoextraction of Pb by Zn/Cd hyperaccumulator P. divaricata, providing a feasible method for the phytoremediation of polymetallic contaminated soils.
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