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吉原 利一*; 鈴井 伸郎; 石井 里美; 北崎 真由*; 山崎 治明*; 北崎 一義*; 河地 有木; 尹 永根; 七夕 小百合*; 橋田 慎之介*; et al.
Plant, Cell & Environment, 37(5), p.1086 - 1096, 2014/05
被引用回数:23 パーセンタイル:67.03(Plant Sciences)Cadmium (Cd) accumulations in a Cd hyper-accumulator fern, (
), and tobacco,
(
), were kinetically analysed using the positron-emitting tracer imaging system under two medium conditions (basal and no-nutrient). In
, maximumly 50% and 15% of the total Cd accumulated in the distal roots and the shoots under the basal condition, respectively. Interestingly, a portion of the Cd in the distal roots returned to the medium. In comparison with
, a little fewer Cd accumulations in the distal roots and clearly higher Cd migration to the shoots were observed in
under the basal condition (maximumly 40% and 70% of the total Cd, respectively). The no-nutrient condition down-regulated the Cd migration in both species, although the regulation was highly stricter in
than in
(almost no migration in
and around 20% migration in
). In addition, the present work enabled to estimate physical and physiological Cd accumulation capacities in the distal roots, and demonstrated condition-dependent changes especially in
. These results clearly suggested occurrences of species-/condition-specific regulations in each observed parts. It is probable that integration of these properties govern the specific Cd tolerance/accumulation in
and
.