A kinetic analysis of cadmium accumulation in a Cd hyper-accumulator fern, Athyrium yokoscense and tobacco plants

作者：Yoshihara Toshihiro^*; Suzui Nobuo; Ishii Satomi; Kitazaki Mayu; Yamazaki Haruaki; Kitazaki Kazuyoshi; Kawachi Naoki; Yin Yong Gen; Ito Tanabata Sayuri; Hashida Shin nosuke; Shoji Kazuhiro; Shimada Hiroaki; Goto Fumiyuki; Fujimaki Shu

来源：Plant, Cell and Environment, 2014, 37(5): 1086-1096.

DOI：10.1111/pce.12217

• PETIS
• Nicotiana tabacum
• tolerance

Cadmium (Cd) accumulations in a Cd hyper-accumulator fern, Athyrium yokoscense (Ay), and tobacco, Nicotiana tabacum (Nt), were kinetically analysed using the positron-emitting tracer imaging system under two medium conditions (basal and no-nutrient). In Ay, 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 Ay, a little fewer Cd accumulations in the distal roots and clearly higher Cd migration to the shoots were observed in Nt 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 Ay than in Nt (almost no migration in Ay and around 20% migration in Nt). 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 Ay. 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 Ay and Nt.

• 出版日期2014-5