Han Sheng-Fang, Li Shu-Wen, Wu Li-Qiang, Wen Hong-Da, Xiao Kai
College of Agronomy, Hebei Agricultural University, 071001 Hebei, China.
Ying Yong Sheng Tai Xue Bao. 2007 Apr;18(4):807-12.
In this paper, the biological traits, physiological parameters, and enzyme activities related to N assimilation and metabolism of wheat varieties with different nitrogen (N) efficiency were studied under low and high N supply. The results showed that under low N supply, the dry mass of root, leaf, and stem as well as the accumulated N amount in plant were in the order of high N efficiency variety > mid N efficiency variety > low N efficiency variety. The variety with high N uptake efficiency (Ji 97-6360) under low N supply had the highest root active absorption area and TTC-reductive activity and the highest leaf nitrate reductase activity and NO3- content, while the variety with high N physiological efficiency (Shixin 5418) had higher nitrite reductase and glutamine synthetase activities but lower NO3- content and NR activity in its leaf. There was a significant positive correlation between nitrogen use efficiency (NUE) and nitrogen uptake index (NUI) under low N supply. The biological traits, physiological parameters, and enzyme activities related to nitrogen assimilation and metabolism of test wheat varieties were not always the same under high and low N supply.
本文研究了不同氮效率小麦品种在低氮和高氮供应条件下与氮同化和代谢相关的生物学特性、生理参数及酶活性。结果表明，在低氮供应条件下，根、叶、茎的干质量以及植株中氮的积累量均表现为高氮效率品种＞中氮效率品种＞低氮效率品种。低氮供应下高氮吸收效率品种（济97-6360）具有最高的根系活跃吸收面积和TTC还原活性，以及最高的叶片硝酸还原酶活性和NO₃⁻含量，而高氮生理效率品种（石新5418）具有较高的亚硝酸还原酶和谷氨酰胺合成酶活性，但其叶片中的NO₃⁻含量和NR活性较低。低氮供应下氮利用效率（NUE）与氮吸收指数（NUI）之间存在显著正相关。供试小麦品种在高氮和低氮供应条件下与氮同化和代谢相关的生物学特性、生理参数及酶活性并不总是相同的。
