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首页> 外文期刊>Journal of food, agriculture & environment >Differences in nitrogen metabolism characteristics of main culm and tillers in wheat (Triticum aestivum L.) with different percentages of productive tiller
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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

机译：不同产量分Tri比例下小麦主茎和分nitrogen的氮素代谢特征差异

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摘要

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.
机译：利用不同分till比例的小麦品种育麦49-198（YM49-198），兰考爱枣8（LKAZ8）和盐湛4110（YZ4110）研究了主茎和不同茎秆的氮代谢特征。分joint期以及叶片抽穗期至花期总氮含量和积累量与叶片氮吸收相关酶活性的关系。结果表明，随着生育期的增长，主茎，早till和中till的谷氨酰胺合成酶（GS，EC6.3.1.2），谷氨酸合酶（GOGAT，EC1.4.1.14）和GS同工酶的活性增加。 GS，GOGAT，GS2和GSx的活性下降，而从分ing期到花期的后期，GS1的活性呈相反的趋势。两者都是减少分till中总氮含量和积累的主要原因。 LKAZ8中主茎氮同化的关键酶活性高于分till，表明PPT低的品种具有较强的主茎优势。拔节后期后期分till的氨基酸含量高于主要茎等分ers。然而，它随后直线下降，这表明晚till的衰老。拔节期总氮含量和积累量减少，这是后期分ers衰老的主要原因。 PPT低的品种的主茎比其他两个PPT高的品种具有更高的氮积累能力。相关分析表明，在抽穗和抽穗期，氮同化的关键酶活性与总氮含量和叶片积累高度正相关。叶片GS2和GSx的活性可用作标记和抽穗期总氮含量和积累的重要候选指标。

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