不同基因型小麦铁营养效率差异及其可能机制

采用营养液培养试验对苗期6个不同小麦基因型旱选10,鲁麦14,小偃54,京411,洛夫林和中国春的铁营养效率进行了研究,并对其可能机制进行了探讨。试验设低铁(2μmol/L)和正常铁(100μmol/L)2个处理。结果表明,小麦的铁营养效率存在基因型差异,其范围从58%到92%。供试基因型中铁营养效率最高的基因型为中国春,最低的为旱选10。本试验条件下,小麦种子中铁浓度与其苗期铁营养效率间未发现相关性。多重回归分析表明,小麦铁营养效率差异主要由铁吸收决定,而铁吸收主要由根表面积差异决定。说明具有较大根表面积的小麦基因型在苗期具有更高的铁营养效率与抵抗铁缺乏的能力。

Iron efficiency of different wheat genotypes and its main contributed factors

A solution experiment was conducted to study the iron (Fe) efficiency of six wheat genotypes, Hanxuan 10, Lumai 14, Xiaoyan 54, Jing 411, Luofulin and Zhongguochun. The results showed that there are genotypic differences in Fe efficiency among different wheat genotypes. Among the tested genotypes, the genotype Zhongguochun has the highest Fe efficiency, while Hanxuan 10 has the lowest under this experimental condition. There were no significant correlations between wheat grain Fe concentration and Fe efficiency during the early growth stage under the condition of this experiment. Further investigation indicates that Fe uptake is the major contributor to Fe efficiency, while root surface is the most important factor affecting Fe uptake.