【摘要】 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。更多还原

【Abstract】 Genetic differences in iron efficiency of 8 peanut cultivars with resistance to iron-deficiency were studied at different stages of growth under low iron stress.At the seedling stage,Fe uptake efficiency was the primary contributor to resistance to iron-deficiency,and Fe uptake amount and root efficiency ration of Fe-resistant cultivars were both much higher than those of Fe-susceptible ones.Compared with susceptible cultivars,resistant ones had higher Fe transport ability and active Fe content in leaves on the whole growth period under low iron stress.Economical utilization efficiency can reflect the resistance to iron deficiency better than Fe utilization efficiency.There were different mechanisms in Fe nutrient characteristics in different Fe-resistant cultivars,some showed high uptake efficiency at early growth stages,while some expressed high transport ability.Correlation analysis showed that active Fe content in leaves and root efficiency ratio were the better indictors of iron efficiency in peanut.更多还原