Bioavailability of zinc to aerobic rice

摘要: Keywords: Arbuscular mycorrhiza, Exudation, Oryza sativa , Rhizosphere, Rice, Soil, Zinc deficiency is a wide-spread constraint for crop production and human health. This thesis should contribute to alleviation of Zn problems aimed at identifying soil plant factors affecting bioavailability in rice ( L.). Two main research questions were: 1) what the consequence cultivation shift from flooded aerobic on 2) which mechanisms control mobilization by rice? Field experiments demonstrated that may increase problems. Lower uptake mass fraction shoot brown were observed fields. Results incubation experiment modeling showed difference found between two systems was orders magnitude lower compared can be expected based chemical equilibria bulk soil. discrepancy suggests properties such as pH, DOC level redox conditions rhizosphere need consideration. We considerable variation among genotypes tolerance under both field pot conditions. In we mainly associated with uptake. Plant low soils increased Zn-mobilizing processes inoculation arbuscular mycorrhizal fungi. significantly uptake, but only inherent High combination effects seems impossible not feasible target breeders. rhizotron nutrient solution experiment, responded root exudation malate. Genotypes higher stronger malate response deficiency. These results confirm our hypothesis genotypic partly explained