摘要
采用田间小区试验,在高、低两个施氮水平下,通过测定分析两个不同基因型冬小麦小偃22和小偃6号不同生育时期的生物量及产量和叶片叶绿素含量、硝酸还原酶活性等生理指标,探讨了其对氮素利用的差异及其机理。结果表明,在不施氮条件下,硝酸还原酶活性、叶绿素含量明显降低;而施氮以后,能明显延缓小麦叶片的衰老,使叶片的叶绿素含量保持在较高水平。就选用的两个基因型品种来说,施氮与否,小偃22比小偃6号的生理代谢更加旺盛,施氮加强了这种作用,这将为进一步选育氮高效利用型小麦品种提供科学依据。
Two varieties, Xiaoyan 22 and Xiaoyan 6, were used in a field plot experiment to study the growth and development characteristics of winter wheat with different nitrogen use efficiency （NUE） by measuring yields, shoot and root biomass at different growth stages, some physiological items such as chlorophyll content, nitrate reduce enzyme activity of winter wheat leaves under two nitrogen rates comparatively. The resuits indicated that the nitrate reduce enzyme activity and the chlorophyll content were reduced significantly under the condition of no nitrogen application, but under the condition of nitrogen application, the senility of winter wheat leaf could be put off obviously. Therefore, the chlorophyll content could be kept at high level. As far as two kinds of genotypes selected, whether with or without nitrogen application, the physiological activity of Xiaoyan 22 was more exuberant than that of Xiaoyan 6, meaning that nitrogen application strengthened this function. These results will provide scientific basis for further selecting and breeding genotypes with higher nitrogen use efficiency.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第6期91-96,共6页
Agricultural Research in the Arid Areas
基金
西北农林科技大学“青年学术骨干”人才专项(01140305)
国家863项目(2006AA1002)
国家自然科学基金重点项目(30230230)
关键词
冬小麦
基因型
氮利用效率
生长发育特征
winter wheat genotype
nitrogen use efficiency
growth and development characteristics
