Journal of Food, Agriculture and Environment
Vol 10,
Issue 3&4,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Differences in nitrogen metabolism characteristics of main culm and tillers in wheat (Triticum aestivum L.) with different percentages of productive tiller
Author(s):
Juan Liu 1,
Xiao-chun Wang 2, Shu-ping Xiong 1, Xin-ming Ma 1, 3 *, Tong-xun Zhang 2, Jing Wang 1, Yan-feng Wang 1Recieved Date: 2012-07-03, Accepted Date: 2012-10-06
Abstract:Wheat cultivars Yu Mai 49-198 (YM49-198), Lan Kao Ai Zao 8 (LKAZ8) and Yan Zhan 4110 (YZ4110) with different percentages of productive tiller (PPT) were used to investigate the nitrogen metabolism characteristics of main culm and different tillers, as well as the relationship of the activities of enzymes involved in nitrogen assimilation in leaves with total nitrogen content and accumulation from jointing stage to anthesis. The results showed that the activities of glutamine synthetase (GS, EC6.3.1.2), glutamate synthase (GOGAT, EC1.4.1.14) and GS isoenzymes in main culm, early tillers and middle tillers increased with the development of growth stage. The activities of GS, GOGAT, GS2 and GSx decreased, whereas the activities of GS1 followed an opposite trend in late tiller from jointing stage to anthesis. Both are major causes of the reduction of total nitrogen content and accumulation in late tillers. The activities of key enzymes involved in nitrogen assimilation of main culm in LKAZ8 were higher than those in tillers, indicating that the cultivar with low PPT has stronger main culm advantages. The amino acid content of late tillers was higher than that in main culms and other tillers in early jointing stage; however, it decreased straightly afterward, signifying senescence in late tillers. The total nitrogen content and accumulation decreased after the jointing stage, which was the main cause of senescence of late tillers. The main culm of cultivar with low PPT had higher nitrogen accumulation capability than the other two cultivars with high PPT. Correlation analysis indicated that the key enzyme activities involved in nitrogen assimilation were highly positively correlated with total nitrogen content and accumulation of leaves in the flagging and heading stages. The activities of GS2 and GSx of leaves can be used as important candidate indicators for total nitrogen content and accumulation at the flagging and heading stages.
Keywords:Wheat (Triticum aestivum L.),
tillers, GS, isoenzyme, nitrogen metabolismJournal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Agriculture
Pages: 861-866
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