Effects of arbuscular mycorrhizal fungi inoculation on arsenic accumulationby tobacco (Nicotiana tabacum L.)
HUA Jianfeng , LIN Xiangui , YIN Rui , JIANG Qian , SHAO Yufang
DOI:
Received November 20, 2008,Revised April 29, 2009, Accepted , Available online
Volume 21,2009,Pages 1214-1220
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A pot experiment was conducted to study the e ects of arbuscular mycorrhizal (AM) fungi (from contaminated or uncontaminated
soils) on arsenic (As) uptake of tobacco (Nicotiana tabacum L.) in As-contaminated soil. Mycorrhizal colonization rate, dry weight,
As and P uptake by plants, concentrations of water-extractable As and As fractions were determined. A low mycorrhizal colonization
rate (< 25%) was detected. Our research indicated that AM fungi isolated from polluted soils were no more e ective than those from
unpolluted soils when grown in symbiosis with tobacco. No significant di erences were observed in roots and stalks dry weights among
all treatments. Leaves and total plant dry weights were much higher in Glomus versiforme treatment than that in control treatment. As
contents in roots and stalks from mycorrhizal treatments were much lower than that from control treatment. Total plant As content
exhibited the same trend. P concentrations in tobacco were not a ected by colonization, nor were stalks, leaves and total plant P
contents. Roots P contents were remarkably lower in HN treatments than in other treatments. Meanwhile, decreased soil pH and lower
water-extractable As concentrations and higher levels of As fraction bound to well-crystallized hydrous oxides of Fe and Al were found
in mycorrhizal treatments than in controls. The protective e ect of mycorrhiza against plant As uptake may be associated with changes
in As solubility mediated by changing soil pH. These results indicated that under As stress, proper mechanisms employed by AM fungi
can protect tobacco against As uptake. Results confirmed that AM fungi can play an important role in food quality and safety.
