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对2种不同磷效率基因型小麦幼苗水培结果表明,NO3-N和NH4NO3-N对小麦植株地上部生长的影响无明显差异,但是对根系生长的影响明显不同。NH4-N对小麦幼苗的生长有明显的抑制作用,且对根系生长的抑制程度显著大于对地上部;对磷低效基因型Jing411的抑制程度明显大于对磷高效基因型Xiaoyan54。NH4NO3-N处理有利于提高植株地上部氮含量和植株的氮吸收效率。Xiaoyan54的植株吸氮量在NH4NO3-N处理中最高,Jing411在NO3-N处理中最高。不同处理对营养液pH值的影响明显不同。NH4NO3-N和NH4-N处理导致营养液pH值降低,NO3-N处理使营养液pH值升高,不同磷效率基因型小麦使营养液pH值降低或升高的程度不同。小麦磷效率基因型差异的表现与否和氮素形态有关,以植株地上部干重为磷效率指标的基因型差异在供应NO3-N时不表现。磷高效基因型Xiaoyan54的生长显著优于磷低效基因型Jing411。
The results of hydroponic culture of two wheat cultivars with different P efficiency showed that the effect of NO3-N and NH4NO3-N on the shoot growth of wheat plants showed no significant difference, but the effect on root growth was obviously different. NH4-N significantly inhibited the growth of wheat seedlings and inhibited the growth of roots more significantly than the shoots. The inhibition of Jing411, a phosphate inefficient genotype, was significantly greater than that of Xiaoyan54, a plant with high phosphorus efficiency. NH4NO3-N treatment is beneficial to improve plant shoot nitrogen content and plant nitrogen absorption efficiency. Xiaoyan54 had the highest nitrogen uptake in NH4NO3-N treatment and Jing411 was the highest in NO3-N treatment. The effect of different treatments on the pH value of nutrient solution is obviously different. The treatment of NH4NO3-N and NH4-N led to the decrease of pH of nutrient solution, the increase of pH value of nutrient solution by NO3-N treatment, and the decrease or increase of pH value of nutrient solution by different P-efficient wheat genotypes. The differences in the performance of wheat P efficiency genotypes were related to the nitrogen forms. The genotypic differences in the above-ground dry weight as the phosphorus efficiency index were not observed when NO3-N was supplied. Phosphorus-efficient genotype Xiaoyan54 grew significantly better than the phosphorus-inefficient genotype Jing411.