from a thesis publicized at ISINIP (2010)
application of Fe(II) reduces Cd content in rice seeds
Motofumi Suzuki11), Hirohiko Sasamoto1),
Tomoya Matuyama1), Atsushi Mori2)
and Satoshi Mori2,3)
AICHI STEEL CORPORATION (JAPAN)1),
NPO-WINEP(Workshop of Iron Nutrition Enhancement in Plant, JAPAN)2),
Ishikawa-prefectural Univ. (JAPAN)3)
absorbed through OsIRT1 transporter in rice.1)
Here, we show in a
paddy field experiment that frequently sprayed Fe(II)-compound
(Tetsuriki-aqua) to the top of rice during the time between panicle
formation and late maturing stage increased Fe and reduced Cd contents
in brown rice.
On the other hand, in the pot experiment of
Cd-contaminated soil, the foliar-sprayed Fe(II)-component to young rice
seedlings did not suppressed the Cd transport from the roots to the
These results suggest that the foliar-sprayed Fe(II) after
panicle formation suppressed the re-translocation of Cd from the leaves
to the seeds, or enhance the transport of Fe into the seeds by
competitively inhibiting Cd transport into the seeds.
Fe(II)-spray test in rice of reproductive stages in the paddy field
Fig. 1. Foliar Fe(II) spray in the paddy field
Table 1. Effect of Fe(II) spray on grain yield
No defect was
observed in Fe spray treatment
Fig. 2. The process of Fe foliar application in paddy field
Fig. 3. Metal concentration in brown rice
brown rice was significantly reduced by the foliar Fe(II)-spray.
Fe and Zn in brown rice was significantly reduced by the foliar
Fe(II) spray test in rice of young seedling stage
organic-Fe(II) (Tetsuriki-aqua) during reproductive stages increased Fe
and reduced Cd contents in brown rice.
technology would be applicable not only for rice but also other crops
like wheat, maize, barely, etc. cultivated under upland condition.
Reference: 1) Nakanishi H, Ogawa I, Ishimaru
Y, Mori S, Nishizawa NK. Iron deficiency enhances cadmium uptake and
translocation mediated by Fe2+ transports
OsIRT1 and OsIRT2 in
rice. Soil Sci Plant Nutr 52,