NMT历史上的今天
2014年12月16日,山东省农科院孔令安用NMT在Frontiers in Plant Science上发表了标题为Effects of high NH4+ on K+ uptake, culm mechanical strength and grain filling in wheat的研究成果。
期刊:Frontiers in Plant Science
主题:高铵抑制小麦根部钾吸收
标题:Effects of high NH4+on K+ uptake, culm mechanical strength and grain filling in wheat
影响因子:4.495
检测指标:K+流速
作者:山东省农科院孔令安
英文摘要
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 ofNH4+ in the presence or
absence of additional K+ (6 g 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.
中文摘要(谷歌机翻)
众所周知,外部NH4+
的高浓度会抑制植物发育中的许多过程,但其潜在机理仍未得到很好的理解。为了确定高水平的NH4+的负面影响是否与竞争性阳离子摄入相关,将小麦种植在提供适量(18
g N m-2)和大量(30 g N m-2)NH4+的田地上在存在或不存在额外的K+(6 g K2O
m-2)的情况下进行图4的测试,以检查茎秆机械强度,维管束的主要成分,氮(N)迁移和谷粒填充率。
结果表明,与中等水平的NH4+相比,过量供应NH4+会显着降低茎秆机械强度,维管束中纤维素和木质素的含量,氮的固定效率(NRE)和籽粒填充率。额外提供的K+大大减轻了高NH4+的这些负面影响,导致籽粒灌浆期间茎秆机械强度提高了19.41–26.95%,NRE增加了34.59%。使用扫描离子选择电极技术(SIET)进行的分析表明,跨膜K
+流入的净速率降低了84.62%,而使用火焰光度法的测量结果表明,在高NH4+的小麦植株中,K+含量降低了36.13%。。
这项研究表明,高NH4+对小麦茎秆机械强度,纤维素和木质素含量,NRE和籽粒充实率的影响可能与抑制小麦吸收K+有关。
(B) The effects of 10 mM NH4+ on the kinetics of the
net K+ ?uxes in wheat root epidermal cells; each point is the mean from
six individual plants. (C) Each column presents
the mean values of the K+ ?uxes measured in the root epidermal cells
over a recording period of 30 min. Nm: moderate NH4+,Nh:10mM NH4+
treatment. The bars represent the standard deviation for six individual
plants. The different letters indicated above each column refer to
signi?cant differences at the P < 0.05 level.
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