摘要： 以具有强抗逆性Synthetic 6×为染色体供体的中国春背景A染色体组代换系为材料，研究了A染色体组各对染色体代换对低氮胁迫下小麦氮效率的影响。结果表明，与CS相比，供体的植株干物质量显著降低，植株含氮量显著增加。用供体A染色体组各对染色体对CS相应染色体进行替换后，各染色体代换系1A-7A的植株干物质量和含氮量数值居于供体和CS之间。其中，6A植株干物质量较CS的降低幅度最小，较供体的增幅最大；5A植株干物质量较CS的降低幅度最大，较供体的增幅最小。供体的植株含氮量显著高于受体CS。与CS相比，2A和6A的植株含氮量显著高于CS，其他代换系与CS的差异不显著。在低氮胁迫条件下，6A和2A的植株氮累积量较供体和CS显著增加。研究表明，小麦植株对低氮条件下的氮素吸收能力表现明显的染色体效应，供体6A和2A含有植株抵御低氮胁迫的氮高效相关基因。

关键词: 小麦, 代换系, 低氮胁迫, 植株于物质量, 氮效率

Abstract: Using the substitution lines of A genome in which the chromosomes of Chinese Spring （CS） to be replaced by the corresponding ones of Synthetic 6, a abiotic stress resistant line of wheat, as the experimental materi- als, the effects of A genome on plant nitrogen use efficiency under low-N condition were evaluated. The results indi- cated that the donor synthetic 6 had lower plant dry matter weight and higher nitrogen content than CS under low-N condition. The plant dry matter weights and nitrogen contents of the substitution lines in which the chromosomes of A genome were replaced by the donor showed the values between the CS and the donor. Of which,6A had the lowest decrease range compared with CS and the highest increase range compared with donr on plant dry matter weight, whereas 5A had the highest decrease range compared with CS and the lowest increase range compared with donr on plant dry matter weight. The plant notrogen contents of 2A and 6A were significantly higher than CS. But no signifi- cant differences on the plant nitrogen contents were found between the other substitution lines with CS. Under low-N condition,the plant accumulative N amounts of 6A and 2A were both significantly higher than CS and donor. Taken together, the results in this study clearly demonstrated that there existed significant chromosome effects on nitrogen uptake capacity in wheat plants under the low-N condition. The 6A and 2A of donor synthetic 6 carry the high-N use related genes that are involved in withstanding the low-N stress.

Key words: Wheat （ Triticum aestivum L. ）, Substitution line Low-N stress, Plant dry matter weight, Nitrogen use efficiency

中图分类号: 

• S512.01