【摘要】 [目的]研究不同染色体倍性小麦分蘖期氮同位素组成(δ15N)的变化。[方法]以不同染色体倍性小麦及不同抗旱性小麦为试验材料,采用EA-Delta pluse质谱仪测定并研究了小麦叶片、根系和整株氮含量、δ15N的变化。[结果]随着染色体倍性的增加(2n→6n),小麦整株δ15N呈增加趋势,整株δ15N更能代表小麦生长过程中氮的分馏情况;现代小麦整株δ15N与其收获性状有关,即高产小麦的δ15N较低。[结论]该研究可为选择高氮利用效率小麦提供理论依据。更多还原

【Abstract】 [Objective] The variation of nitrogen isotopic composition(δ15N) of wheat with different chromosome ploidy at tillering stage was studied in our paper.[Method] Using wheat with different chromosome ploidy and drought resistance as test material,the nitrogen content and δ15N of wheat leaf,root and whole plant were determined and studied by means of EA-Delta pluse mass spectrometer.[Result] With the increase of chromosome ploidy(2n→6n),the δ15N of whole plant showed increase trend and could more reflect the fractionation of nitrogen in the growth of wheat;the δ15N of whole plant in modern wheat was related to yield character,namely high-yield wheat had lower δ15N.[Conclusion] Our study could provide theoretical basis for choosing wheat with high nitrogen use efficiency.更多还原