摘要： 为了探明CaCO₃对不同基因型小麦Zn吸收的影响，采用人工春化后的小麦幼苗在温室中进行了水培试验。结果表明：缺Zn和在营养液中添加100 mg/L CaCO₃对小麦分蘖和生长发育未表现出明显的不良影响，而供试的3种基因型小麦（远丰998、中育6号及小偃22）的分蘖数及长势有明显的差异。与缺Zn相比，供Zn使小麦根部P吸收量增加25.6%，但对N，K吸收无明显影响。供Zn显著提高了小麦植株各部分尤其是根中的Zn含量和吸收量，而不同基因型间无显著差异，添加CaCO₃未降低对Zn的吸收。添加CaCO₃后，小麦叶片叶绿素SPAD值降低21.4%，但对小麦植株的Fe吸收无明显影响。据此推测叶绿素SPAD值的降低并非由于CaCO₃降低小麦对Fe的吸收而引起的，其原因有待进一步研究。而供Zn仅能增加小麦根部Fe吸收量，对地上部无明显影响。无论是否供Zn，Fe主要累积在小麦的根部，而供Zn加剧了这种累积。

关键词: 碳酸钙, 锌, 小麦基因型, 养分吸收, 碳酸氢根

Abstract: A solution culture experiment was conducted to investigate the influence of calcium carbonate on zinc uptake using three wheat genotypes(Yuanfeng 998,Zhongyu 6 and Xiaoyan 22).The obtained results showed that it had no obvious effect of adding Zn or CaCO₃ on tillering and growth of wheat plants before earring,but it was significantly different for different wheat genotypes.Comparing with Zn deficiency,adding Zn in the nutrient solution increased by(25.6 %) P uptake by root obviously,but the N and K uptake was not affected.Adding Zn in the nutrient solution could significantly increase Zn uptake compared to no Zn addition,however,there was no obvious effects for different genotypes or adding CaCO₃ on uptake of Zn.The leaf chlorophyll SPAD value decreased by 21.36% under the condition of CaCO₃ addition,but it had no obvious effect on Fe uptake,so adding CaCO₃ perhaps was not the reason which led to the reduction of chlorophyll SPAD value.Only in the part of root Fe uptake of different wheat genotypes was increased when adding Zn,and supply Zn strengthened Fe accumulation in roots.

Key words: Calcium carbonate, Zinc, Wheat genotype, Nutrient uptake, Bicarbonate

中图分类号: 

• S143.72

• Q945.12