Differential expression of genes encoding phosphate transporters contributes to arsenic accumulation in shrub willow (Salix spp.)
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Environmental and Experimental Botany. 75: 248-257.
Studies of arsenate and phosphate uptake by plants in hydroponic and soil systems indicate a common transport mechanism via the phosphate transporters (PHTs) due to structural similarity of the anions. Typically, the presence of phosphate decreases plant uptake and translocation of arsenate in hydroponic solution. This study quantified arsenic (As) uptake related to the presence of phosphorus in an As-tolerant willow (Salix viminalis x Salix miyabeana) and an As-sensitive willow (Salix eriocephala). Addition of phosphate resulted in greater As accumulation than in treatments without phosphate in both genotypes, although the tolerant genotype accumulated more As than the sensitive one. Expression of genes for two putative high-affinity phosphate transporters, PHT1;3 and PHT1;12, were up-regulated in both willow genotypes upon addition of As, but to a greater extent in the As-sensitive genotype. Expression of a third putative transporter, PHT1;4, was greater in the As-sensitive genotype but was not up-regulated as a result of As addition in either genotype.
Keywordsγ-Glutamylcysteine; Gene expression; Phosphate transporters; Phytochelatins; Phytoremediation
Puckett, Emily E.; Serpiglia, Michelle J.; DeLeon, Alyssa M.; Long, Stephanie; Minocha, Rakesh; Smart, Lawrence B. 2012. Differential expression of genes encoding phosphate transporters contributes to arsenic accumulation in shrub willow (Salix spp.). Environmental and Experimental Botany. 75: 248-257. https://doi.org/10.1016/j.envexpbot.2011.07.008.