Differential uptake and translocation of β‐HCH and dieldrin by several plant species from hydroponic medium

Abstract

To compare the uptake and translocation of hydrophobic organic chemicals (HOCs) by plant species, we performed uptake experiments with β-1,2,3,4,5,6-hexachlorocyclohexane (β-HCH) and 1,2,3,4,10,4,4a,5,6,7,8,8-dimethanonaphthalene (dieldrin) using 5 species: Hordeum vulgare, Glycine max, Solanum lycopersicum, Brassica oleracea, and Cucurbita pepo. We evaluated uptake ability by root concentration factor (RCF) and translocation ability by transpiration stream concentration factor (TSCF). RCFs of β-HCH and dieldrin did not differ remarkably among species, except that that of β-HCH in B. oleracea was high. TSCFs of β-HCH and dieldrin were high in C. pepo, which was not superior in uptake as estimated by RCF. TSCF of dieldrin in C. pepo was decreased in darkness, and was markedly decreased by heating of roots. These results support the hypothesis that transport proteins produced in the root contribute to dieldrin translocation. On the other hand, TSCF of β-HCH was not decreased by these treatments. Therefore, translocation of β-HCH might not need the contribution of transport proteins. It is possible that C. pepo has a certain function to transport HOCs smoothly in root tissues.

Improved prediction of the bioconcentration factors of organic contaminants from soils into plant/crop roots by related physicochemical parameters

“…The RCF (water) data of 37 chemicals with a number of plants/crops from 11 hydroponic studies (Briggs et al, 1982; De Carvalho et al, 2007; Gao et al, 2008; García-Valcárcel et al, 2016; Hinman and Klaine, 1992; Namiki et al, 2015; Romeh, 2014; San Miguel et al, 2013; Su and Zhu, 2006; Su et al, 2009; Xia and Ma, 2006) are listed in Table S1 (Supporting Information). Total data points are 48.…”

Differential uptake and translocation of organic chemicals by several plant species from soil

“…Cucurbitaceae have a specific transport mechanism for highly hydrophobic organic chemicals such as dieldrin; it was previously suggested that they have transport proteins that play an important role in root-shoot translocation of dieldrin. 22,23) 2. Bioconcentration factors of organic chemicals in roots and shoots In the preceding section, we discussed differences in the uptake and translocation of organic chemicals among plant species.…”

The influence of <i>Brassica rapa</i> var. <i>perviridis</i> growth conditions on the uptake and translocation of pesticides

“…It was reported that the RCFs of β-HCH and dieldrin were not changed by dark treatment. 21) Because tolclofos-methyl has similarly high hydrophobicity to β-HCH and dieldrin, it was thought that its uptake ability would not be affected by day length.…”