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Genotype differences in Fe accumulation and mobilization in root apoplast of Fe-deficient apple seedling

Zhang Fusuo, Liu Shujuan, Mao Daru

Department of Plant Nutrition, Beijing Agricultural University. Beijing 100094

Abstract

The genotypic differences in Fe accumulation and mobilization in root apoplast of Fe-deficient apple seedlings grown in nutrient solution was studied in nutrient solution under controlled environmental conditions. The results demonstrated that compared with Fe-inefficient genotype Malus baccata, Fe-efficient genotype Malus xiao Jinensis seedlings had large Fe-pools in root apoplast, the mobilization of Fe from this Fe-pools was enhanced considerably under iron deficiency. In addition, the ability to form Fe-pools in plant root apoplast varieda ccording to the Fe-form supplied: less stable Fe chelate (FePS) resulted in a larger root apoplasmic Fe pool than stable Fe chelate (FeDFOB). The implication of loading of Fe in root apoplasm and Fe mobilization from this pool was also discussed as a possible screening method for genotype selection.

Key words: Apoplasmic Fe accumulation;Fe mobilization;Fe-deficiency;Genotypic difference;Malus

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Citing This Article：

Zhang Fusuo, Liu Shujuan, Mao Daru. Genotype differences in Fe accumulation and mobilization in root apoplast of Fe-deficient apple seedling. Acta Physiol Sin 1996; 48 (4): (in Chinese with English abstract).