玉米亲子代锌铁吸收和分配的研究

以玉米子粒高锌铁含量自交系NXR22（母本）、子粒低锌铁含量自交系NXR12（父本）及其配制的杂交种（F₁）为供试材料,比较双亲及其后代不同穗位的叶片、茎秆及子粒中锌和铁含量、积累量在吐丝期与成熟期间的差异,解析亲子代锌铁吸收与分配特征。研究结果表明:不同基因型玉米叶片、茎秆、子粒中锌铁含量和积累量存在显著差异。F₁不同穗位的叶片和茎秆锌铁含量介于双亲之间,且偏向于子粒锌铁含量高的亲本;锌铁积累量显著高于双亲,表现出明显的杂种优势。从吐丝期到成熟期3个供试材料不同穗位的叶片和茎秆锌铁含量和积累量均表现出一定程度的增加。F₁子粒中锌含量及积累量偏向于母本,表现出杂种优势;铁含量介于双亲之间,更偏向于母本。

Study on the Absorption and Distribution of Zinc and Iron between Maize Hybird and Its Parents

Using high grain zinc and iron concentration parent NXR22 (female), low grain zinc and iron concentration parent NXR12 (male), and their F₁, to analyze the concentration and accumulation of zinc and iron in different parts of leaves, stems, and grains, and the characteristics of zinc and iron absorption and distribution in parents and hybrid. The results showed that there were significant differences in zinc and iron concentration and accumulation in leaves, stems and grains of maize with different genotypes. The concentration of zinc and iron in leaves and stems of different ear positions of hybrids was between their parents and tended to the parents with high concentration of zinc-iron in grains. The accumulation of zinc and iron in leaves and stems of different ear positions of hybrids showed obvious heterosis, which was significantly higher than that of their parents. The concentration of zinc and iron in leaves and stems of parents and hybrids increased from silking stage to mature stage. The concentration of zinc in hybrid grain tended to be higher than that of the female parent, and the amount of accumulation showed heterosis. The concentration of iron in hybrid grain was between parents, and the accumulation tended to be higher than that of the female parent with high concentration of zinc and iron.