title: Effects of silicon and copper on bamboo grown hydroponically.
abstract: Due to its high growth rate and biomass production, bamboo has recently been proven to be useful in wastewater treatment. Bamboo accumulates high silicon (Si) levels in its tissues, which may improve its development and tolerance to metal toxicity. This study investigates the effect of Si supplementation on bamboo growth and copper (Cu) sensitivity. An 8-month hydroponic culture of bamboo Gigantocloa sp. "Malay Dwarf " was performed. The bamboo plants were first submitted to a range of Si supplementation (0-1.5 mM). After 6 months, a potentially toxic Cu concentration of 1.5 μM Cu(2+) was added. Contrary to many studies on other plants, bamboo growth did not depend on Si levels even though it absorbed Si up to 218 mg g(-1) in leaves. The absorption of Cu by bamboo plants was not altered by the Si supplementation; Cu accumulated mainly in roots (131 mg kg(-1)), but was also found in leaves (16.6 mg kg(-1)) and stems (9.8 mg kg(-1)). Copper addition did not induce any toxicity symptoms. The different Cu and Si absorption mechanisms may partially explain why Si did not influence Cu repartition and concentration in bamboo. Given the high biomass and its absorption capacity, bamboo could potentially tolerate and accumulate high Cu concentrations making this plant useful for wastewater treatment.
authors.affiliation: CEREGE, CNRS, Aix-Marseille Univ., Europôle méditerranéen de l'Arbois BP 80, 13 545, Aix en Provence, France. collin.blanche@gmail.com
authors.forename: Blanche
authors.initials: B
authors.lastname: Collin
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Doelsch
authors.forename: Catherine
authors.initials: C
authors.lastname: Keller
authors.forename: Frédéric
authors.initials: F
authors.lastname: Panfili
authors.forename: Jean-Dominique
authors.initials: JD
authors.lastname: Meunier
mesh_terms: D001673:Biodegradation, Environmental; D003300:Copper / Q000378:metabolism*; D018527:Hydroponics; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D006109:Poaceae / Q000187:drug effects* / Q000254:growth & development*; D012825:Silicon / Q000378:metabolism* / Q000494:pharmacology; D013997:Time Factors
chemical_list: D003300:Copper; D012825:Silicon