不同烟草基因型氮素吸收效率与利用效率差异

发布时间：2018-12-30 17:39

【摘要】：为探究不同烟草基因型氮素吸收与利用的差异,采用营养液培养方法对74个不同基因型烟草苗期进行低氮(0.5mmol/L)和高氮(5.0 mmol/L)处理,分析了其氮素营养指标和氮效率。结果表明,不同烟草基因型之间的氮效率差异显著,且基因型与氮水平之间互作显著。依据地上部生物量可以将不同烟草基因型的氮效率分为双高效型、低氮高效型、高氮高效型和双低效型4类。不同供氮水平下,氮素吸收效率对氮效率的直接作用均大于氮素利用效率,氮高效基因型的地上部生物量、植株氮累积量、氮素吸收效率、氮效率均显著高于氮低效基因型,氮素利用效率则差异不显著。由此,氮素吸收能力在氮高效烟草基因型的选育和栽培上更加重要。
[Abstract]:In order to explore the difference of nitrogen uptake and utilization among different tobacco genotypes, 74 tobacco genotypes were treated with low nitrogen (0.5mmol/L) and high nitrogen (5.0 mmol/L) with nutrient solution culture. The nitrogen nutrition index and nitrogen efficiency were analyzed. The results showed that there were significant differences in nitrogen efficiency among different tobacco genotypes and significant interaction between genotypes and nitrogen levels. According to the aboveground biomass, the nitrogen efficiency of different tobacco genotypes can be divided into four types: double high efficiency type, low nitrogen efficiency type, high nitrogen efficiency type and double low efficiency type. The direct effect of nitrogen uptake efficiency on nitrogen efficiency was higher than that on nitrogen use efficiency at different nitrogen supply levels. The aboveground biomass, plant nitrogen accumulation, nitrogen absorption efficiency and nitrogen efficiency of nitrogen efficient genotypes were significantly higher than those of low nitrogen efficiency genotypes. There was no significant difference in nitrogen use efficiency. Therefore, nitrogen absorption ability is more important in breeding and cultivation of nitrogen efficient tobacco genotypes.
【作者单位】：江西农业大学农学院作物生理生态与遗传育种教育部重点实验室江西省作物生理生态与遗传育种重点实验室;江西省烟叶科学研究所;
【基金】：江西省烟草专卖局科技项目“烟草种质资源的收集引进与种质库建立”(201401001)
【分类号】：S572

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