First published online February 24, 2002; 10.1104/pp.010733
Plant Physiol, March 2002, Vol. 128, pp. 1120-1128
Uptake Kinetics of Arsenic Species in Rice Plants
Mohammed Joinal
Abedin,
Jörg
Feldmann, and
Andy A.
Meharg*
Departments of Plant and Soil Science (M.J.A., A.A.M.) and
Chemistry (J.F.), University of Aberdeen, St. Machar Drive,
Aberdeen AB24 3UU, United Kingdom
Arsenic (As) finds its way into soils used for rice
(Oryza sativa) cultivation through polluted irrigation
water, and through historic contamination with As-based pesticides. As
is known to be present as a number of chemical species in such soils,
so we wished to investigate how these species were accumulated by rice. As species found in soil solution from a greenhouse experiment where
rice was irrigated with arsenate contaminated water were arsenite,
arsenate, dimethylarsinic acid, and monomethylarsonic acid. The
short-term uptake kinetics for these four As species were determined in
7-d-old excised rice roots. High-affinity uptake (0-0.0532
mM) for arsenite and arsenate with eight rice varieties, covering two growing seasons, rice var. Boro (dry season) and rice var.
Aman (wet season), showed that uptake of both arsenite and arsenate by
Boro varieties was less than that of Aman varieties. Arsenite uptake
was active, and was taken up at approximately the same rate as
arsenate. Greater uptake of arsenite, compared with arsenate, was found
at higher substrate concentration (low-affinity uptake system).
Competitive inhibition of uptake with phosphate showed that arsenite
and arsenate were taken up by different uptake systems because arsenate
uptake was strongly suppressed in the presence of phosphate, whereas
arsenite transport was not affected by phosphate. At a slow rate, there
was a hyperbolic uptake of monomethylarsonic acid, and limited uptake
of dimethylarsinic acid.
*
Corresponding author; e-mail a.meharg{at}abdn.ac.uk; fax
0044-1224-272703.
© 2002 American Society of Plant Physiologists
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