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COMPARATIVE STUDY
JOURNAL ARTICLE
Genotypic differences in cadmium transport in developing barley grains.
Genotypic differences in cadmium (Cd) transport in developing grains of barley (Hordeum vulgare L.) were investigated using detached ears cultured in a nutrient solution containing 0.5 and 5 μM Cd. Cd concentration in each part of the ear in W6nk2 (a low-grain-Cd-accumulation genotype) was much less than in Zhenong8 (a high accumulator) with 0.5 μM Cd treatment. However, Cd concentration in W6nk2 grains increased with an increase in external Cd level and was similar to Zhenong8 with 5 μM Cd treatment. Awn removal, a high relative humidity (RH, 90%) and addition of sucrose markedly decreased grain Cd concentration in Zhenong8 but less affected Cd transport to grain in W6nk2. Stem girdling reduced Cd transport to developing grains with 5 μM Cd treatment, especially for W6nk2, whereas no effect was found in either genotype with low Cd treatment. Our results suggested that higher grain Cd in Zhenong8 is closely related to a larger capacity for xylem transport and is connected with Cd translocation in xylem and phloem sap.
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