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以不同耐低铁能力的8个花生品种为试材,研究了低铁胁迫下不同品种在各个生育期的铁养分效率差异。在苗期,耐低铁品种的铁吸收量和根效率比均大于铁敏感品种,铁吸收效率是决定品种耐低铁能力的主要因素。低铁胁迫下,耐低铁品种叶片的活性铁含量和向地上部运输铁的能力在整个生长期均明显高于铁敏感品种。铁经济利用效率比利用效率更能反映花生耐低铁能力的品种间差异。不同耐低铁花生品种的铁营养特性也有所不同,有的表现为生长前期植株对铁较高的吸收效率,有的则表现出较强的运输能力。相关分析表明,叶片活性铁和根效率比可作为花生铁养分效率高低的良好指标。
Eight peanut cultivars with different tolerance to low iron were used as materials to study the iron nutrient efficiency of different cultivars at different growth stages under low iron stress. At seedling stage, the iron absorption rate and root efficiency ratio of low-resistant varieties were higher than that of iron-sensitive varieties. Iron absorption efficiency was the main factor that determined the tolerance of varieties to low-iron content. Under low iron stress, the content of active iron and the ability to transport iron to shoots of low-iron-resistant varieties were significantly higher than those of iron-sensitive varieties during the whole growth period. The efficiency of economic utilization of iron is better than the utilization efficiency of peanut to better reflect the ability of low iron tolerance differences between varieties. The iron nutrition characteristics of different resistant low-iron peanut varieties are also different, some of them showed the higher absorption efficiency of iron for early growth plants, while others showed strong transport capacity. Correlation analysis showed that active iron and root efficiency ratio of leaves could be used as a good indicator of nutrient efficiency of peanut iron.