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Effects of high NH4+ on K+ uptake, culm mechanical strength and grain filling in wheat

文献类型： 外文期刊

作者： Kong, Lingan 1 ; Sun, Mingze 1 ; Wang, Fahong 1 ; Liu, Jia 1 ; Feng, Bo 1 ; Si, Jisheng 1 ; Zhang, Bin 1 ; Li, Shengdong; 1 ;

作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China

关键词： ammonium (NH4+);culm mechanical strength;K+ flux;N remobilization;wheat (Triticum aestivum L.)

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2014 年 5 卷

页码：

收录情况： SCI

摘要： It is well established that a high external NH4+ concentration depresses many processes in plant development, but the underlying mechanisms are still not well understood. To determine whether the negative effects of high levels of NH4+ are related to competitive cation uptake, wheat was grown in a field with moderate (18 g N m(-2)) and high (30 g N m-2) supplies of NH4+ in the presence or absence of additional K+ (6g K2O m(-2)) to examine culm mechanical strength, the main components of the vascular bundle, nitrogen (N) remobilization and the grain-filling rate. The results indicated that an excessive supply of NH4+ significantly decreased culm mechanical strength, the cellulose and lignin contents of vascular bundles, the N remobilization efficiency (NRE) and the grain-filling rate compared with a moderate level of NH4+. The additional provision of K+ considerably alleviated these negative effects of high NH4+, resulting in a 19.41-26.95% increase in culm mechanical strength during grain filling and a 34.59% increase in the NRE. An assay using the scanning ion-selective electrode technique (SIET) showed that the net rate of transmembrane K+ influx decreased by 84.62%, and measurements using flame photometry demonstrated that the K+ content decreased by 36.13% in wheat plants subjected to high NH4+. This study indicates that the effects of high NH4+ on culm mechanical strength, cellulose and lignin contents, the NRE and the grain-filling rate are probably associated with inhibition of K+ uptake in wheat.

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