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A kinetic analysis of cadmium accumulation in a Cd hyper‐accumulator fern, A thyrium yokoscense and tobacco plants
Author(s) -
YOSHIHARA TOSHIHIRO,
SUZUI NOBUO,
ISHII SATOMI,
KITAZAKI MAYU,
YAMAZAKI HARUAKI,
KITAZAKI KAZUYOSHI,
KAWACHI NAOKI,
YIN YONGGEN,
ITOTANABATA SAYURI,
HASHIDA SHINNOSUKE,
SHOJI KAZUHIRO,
SHIMADA HIROAKI,
GOTO FUMIYUKI,
FUJIMAKI SHU
Publication year - 2014
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12217
Subject(s) - cadmium , fern , shoot , nutrient , botany , nicotiana tabacum , chemistry , biology , horticulture , biochemistry , gene , organic chemistry
Cadmium ( Cd ) accumulations in a Cd hyper‐accumulator fern, A thyrium yokoscense ( Ay ), and tobacco, N icotiana 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 .