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Soil CO2 venting as one of the mechanisms for tolerance of Zn deficiency by rice in flooded soils

机译：土壤二氧化碳作为洪水土壤中Zn缺乏耐受性的一种机制之一

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摘要

We sought to explain rice (Oryza sativa) genotype differences in tolerance of zinc (Zn) deficiency in flooded paddy soils and the counter-intuitive observation, made in earlier field experiments, that Zn uptake per plant increases with increasing planting density. We grew tolerant and intolerant genotypes in a Zn-deficient flooded soil at high and low planting densities and found (a) plant Zn concentrations and growth increased with planting density and more so in the tolerant genotype, whereas the concentrations of other nutrients decreased, indicating a specific effect on Zn uptake; (b) the effects of planting density and genotype on Zn uptake could only be explained if the plants induced changes in the soil to make Zn more soluble; and (c) the genotype and planting density effects were both associated with decreases in dissolved CO2 in the rhizosphere soil solution and resulting increases in pH. We suggest that the increases in pH caused solubilization of soil Zn by dissolution of alkali-soluble, Zn-complexing organic ligands from soil organic matter. We conclude that differences in venting of soil CO2 through root aerenchyma were responsible for the genotype and planting density effects.
机译：我们试图解释淹没水稻土锌（Zn）缺乏耐受性耐锌（Zn）的基因型差异，并在早期的现场实验中进行的反向直观观察，随着种植密度的增加，Zn摄取增加。在高低种植的密度下，我们在抗缺乏洪水土壤中增长和不宽容的基因型，发现（a）植物Zn浓度和生长随种族密度而增加，耐受性基因型，而其他营养物的浓度降低，表明对Zn吸收的特定影响; （b）只有在植物诱导土壤中的变化使Zn更加易溶地，才能解释种植密度和基因型对Zn摄取的影响; （c）基因型和种植密度效应与根际土壤溶液中溶解二氧化碳的降低均相关，并在pH下产生增加。我们建议通过从土壤有机物质溶解碱溶性，Zn络合有机配体对土壤Zn的溶解引起的pH值增加。我们得出结论，通过根灌炉，土壤二氧化碳通风的差异对基因型和种植密度效应负责。

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