Enhancement patterns of potassium on nitrogen transport and functional genes in cotton vary with nitrogen levels

The application of potassium (K) in conjunction with nitrogen (N) has been shown to enhance N use efficiency. However, there is still a need for further understanding of the optimal ratios and molecular regulatory mechanisms, particularly in soil-cotton systems. Here, a field trial was conducted, in...

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Veröffentlicht in:Plant science (Limerick) 2023-10, Vol.335, p.111824-111824, Article 111824
Hauptverfasser: Chen, Peng, Li, Linyang, Xia, Shujie, Zhang, Runhua, Zhang, Runqin, Zeng, Xiao-Min, Shuai, Du, Liu, Yi, Li, Zhi-Guo
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container_issue
container_start_page 111824
container_title Plant science (Limerick)
container_volume 335
creator Chen, Peng
Li, Linyang
Xia, Shujie
Zhang, Runhua
Zhang, Runqin
Zeng, Xiao-Min
Shuai, Du
Liu, Yi
Li, Zhi-Guo
description The application of potassium (K) in conjunction with nitrogen (N) has been shown to enhance N use efficiency. However, there is still a need for further understanding of the optimal ratios and molecular regulatory mechanisms, particularly in soil-cotton systems. Here, a field trial was conducted, involving varying rates of N and K, alongside pot and hydroponic experiments. The objective was to assess the impact of N-K interaction on the absorption, transport and distribution of N in cotton. The results showed that K supply at 90 and 240kgha had a beneficial impact on N uptake and distribution to both seed and lint, resulting in the highest N use efficiency ranging from 22 to 62% and yield improvements from 20 to 123%. The increase in stem and root diameters, rather than the quantify of xylem vessels and phloem sieve tubes, facilitated the uptake and transport of N due to the provision of K. At the molecular level, K supply upregulated the expression levels of genes encoding GhNRT2.1 transporter and GhSLAH3 channel in cotton roots to promote N uptake and GhNRT1.5/NPF7.3 genes to transport N to shoot under low-N conditions. However, under high-N conditions, K supply induced anion channel genes (GhSLAH4) of roots to promote N uptake and genes encoding GhNRT1.5/NPF7.3 and GhNRT1.8/NPF7.2 transporters to facilitate NO unloading from xylem to mesophyll cell in high-N plants. Furthermore, K supply resulted in the upregulation of gene expression for GhGS2 in leaves, while simultaneously downregulating the expression of GhNADH-GOGAT, GhGDH1 and GhGDH3 genes in high-N roots. The enzyme activities of nitrite reductase and glutamine synthetase increased and glutamate dehydrogenase decreased, but the concentration of NO and soluble protein exhibited a significant increase and free amino acid decreased in the shoots subsequent to K supply.
doi_str_mv 10.1016/j.plantsci.2023.111824
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However, there is still a need for further understanding of the optimal ratios and molecular regulatory mechanisms, particularly in soil-cotton systems. Here, a field trial was conducted, involving varying rates of N and K, alongside pot and hydroponic experiments. The objective was to assess the impact of N-K interaction on the absorption, transport and distribution of N in cotton. The results showed that K supply at 90 and 240kgha had a beneficial impact on N uptake and distribution to both seed and lint, resulting in the highest N use efficiency ranging from 22 to 62% and yield improvements from 20 to 123%. The increase in stem and root diameters, rather than the quantify of xylem vessels and phloem sieve tubes, facilitated the uptake and transport of N due to the provision of K. At the molecular level, K supply upregulated the expression levels of genes encoding GhNRT2.1 transporter and GhSLAH3 channel in cotton roots to promote N uptake and GhNRT1.5/NPF7.3 genes to transport N to shoot under low-N conditions. However, under high-N conditions, K supply induced anion channel genes (GhSLAH4) of roots to promote N uptake and genes encoding GhNRT1.5/NPF7.3 and GhNRT1.8/NPF7.2 transporters to facilitate NO unloading from xylem to mesophyll cell in high-N plants. Furthermore, K supply resulted in the upregulation of gene expression for GhGS2 in leaves, while simultaneously downregulating the expression of GhNADH-GOGAT, GhGDH1 and GhGDH3 genes in high-N roots. 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The enzyme activities of nitrite reductase and glutamine synthetase increased and glutamate dehydrogenase decreased, but the concentration of NO and soluble protein exhibited a significant increase and free amino acid decreased in the shoots subsequent to K supply.</abstract><cop>Ireland</cop><pmid>37572966</pmid><doi>10.1016/j.plantsci.2023.111824</doi><tpages>1</tpages></addata></record>
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source Elsevier ScienceDirect Journals
subjects absorption
field experimentation
free amino acids
gene expression
glutamate dehydrogenase
glutamate-ammonia ligase
hydroponics
lint cotton
mesophyll
nitrite reductase
nitrogen
nutrient use efficiency
phloem
potassium
xylem
title Enhancement patterns of potassium on nitrogen transport and functional genes in cotton vary with nitrogen levels
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