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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2017.04.005
|2 doi
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|a pubmed24n0904.xml
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|a (DE-627)NLM271278978
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|a (NLM)28441628
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|a (PII)S0981-9428(17)30125-0
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Hu, Wei
|e verfasserin
|4 aut
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|a Potassium deficiency affects the carbon-nitrogen balance in cotton leaves
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 29.12.2017
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2017 Elsevier Masson SAS. All rights reserved.
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|a Potassium (K) plays important roles in the metabolism of carbon (C) and nitrogen (N), but studies of K deficiency affecting C-N balance are lacking. This study explored the influence of K deficiency on C-N interaction in cotton leaves by conducting a field experiment with cotton cultivar DP0912 under two K rates (K0: 0 kg K2O ha-1 and K67: 67 kg K2O ha-1) and a controlled environment experiment with K-deficient solution (K1: 0 mM K+) and K-sufficient solution (K2: 6 mM K+). The results showed that leaf K content, leaf number, leaf area, boll number, reproductive dry weight and total dry weight were significant lower under K deficiency (K0 or K1). Lower total chlorophyll content and Chl a/b ratio, and decreased Pn along with lower Gs and higher Ci were measured under K deficiency, suggesting that the decrease in Pn was resulted from non-stomatal limitation. Leaf glucose, fructose, sucrose and starch contents were higher under K deficiency, because lower sucrose export was detected in phloem. Although leaf nitrate and ammonium contents significantly decreased, free amino acid content was increased by 40-63% under K deficiency, since lower amino acid export was also measured in phloem. K deficiency also induced lower soluble protein content in leaves. Leaf ATP level was significantly increased under K deficiency, indicating ATP utilization was lower, so that less energy was supplied to C and N metabolism. The ratio of soluble sugar to free amino acid and the C/N ratio markedly increased under K deficiency, and one reason was that the phloem export reduced more prominent for sucrose (54.6-78.0%) than amino acid (36.7-85.4%) under K deficiency. In addition, lower phosphoenolpyruvate carboxylase activity limited malate and citrate biosynthesis under K deficiency, causing a decrease of C flux into the amino acids, which was not beneficial for maintaining C-N balance. Sucrose phosphate synthase and nitrate reductase activities were lower under K deficiency, which would limit sucrose biosynthesis and nitrate assimilation. This was another factor altering soluble sugar to free amino acid ratio and C/N ratio in the K-deficient leaves
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|a Journal Article
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|a Carbon-nitrogen balance
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|a Cotton (Gossypium hirsutum L.) leaves
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|a Potassium deficiency
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|a Chlorophyll
|2 NLM
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|a 1406-65-1
|2 NLM
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| 650 |
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|a Carbon
|2 NLM
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| 650 |
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|a 7440-44-0
|2 NLM
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 650 |
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|a Potassium
|2 NLM
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| 650 |
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|a RWP5GA015D
|2 NLM
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| 700 |
1 |
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|a Coomer, Taylor D
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Loka, Dimitra A
|e verfasserin
|4 aut
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1 |
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|a Oosterhuis, Derrick M
|e verfasserin
|4 aut
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| 700 |
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|a Zhou, Zhiguo
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 115(2017) vom: 01. Juni, Seite 408-417
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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| 773 |
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|g volume:115
|g year:2017
|g day:01
|g month:06
|g pages:408-417
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|u http://dx.doi.org/10.1016/j.plaphy.2017.04.005
|3 Volltext
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