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用营养液培养方法研究了耐低磷和低磷敏感玉米幼苗对低铁胁迫的基因型差异。结果表明,铁处理和基因型对玉米的生长和养分吸收影响显著,铁处理和基因型之间存在互作。低铁胁迫对各基因型玉米幼苗地上部生物重的影响十分明显,对低磷敏感基因型玉米地上部生物重的抑制作用显著大于耐低磷基因型。铁在玉米植株中集中分布在根部,与耐低磷特性无关。低铁胁迫显著降低了各基因型玉米幼苗叶片的叶绿素含量,但基因型间无明显差异。低铁胁迫对根系生长有一定的促进作用,可以诱导地上部同化产物向根系转运,促进根系代偿性伸长。
The nutrient solution culture method was used to study the genotype difference of low iron tolerance in low and low phosphorus-sensitive maize seedlings. The results showed that iron treatment and genotype had significant effects on maize growth and nutrient uptake, and there was interaction between iron treatment and genotype. The effects of low iron stress on the biomass of shoots of all genotypes of maize were obvious, and the inhibition of aboveground biomass of low-P-sensitive genotype maize was significantly greater than that of low-phosphorus tolerant genotypes. Iron is concentrated in the corn plants in the roots, and has nothing to do with the characteristics of low phosphorus tolerance. Low-iron stress significantly reduced chlorophyll content in leaves of all genotypes of maize seedlings, but no significant differences were found among the genotypes. Under low iron stress, root growth was promoted to some extent, which could induce shoots to assimilate to the roots and promote root compensatory elongation.