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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2019.08.030
|2 doi
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|a pubmed24n1004.xml
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|a DE-627
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|a eng
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|a Sperling, Or
|e verfasserin
|4 aut
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|a Excessive nitrogen impairs hydraulics, limits photosynthesis, and alters the metabolic composition of almond trees
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 03.02.2020
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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 © 2019 Elsevier Masson SAS. All rights reserved.
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|a Horticulture nitrogen (N) runoffs are major environmental and health concerns, but current farming practices cannot detect ineffective N applications. Hence, we set to recognize high N conditions and characterize their effects on the physiology of almond trees grown in drainage lysimeters. Water and nutrients mass balances exhibited that N benefitted almond trees in a limited range (below 60 mg N L-1 in irrigation), while higher N conditions (over a 100 mg N L-1) reduced evapotranspiration (ET) by 50% and inherently constrained N uptake. Respectively, whole-tree hydraulic conductance reduced by 37%, and photosynthesis by 17%, which implied that high N concentrations could damage trees. Through gas-chromatography, we realized that high N conditions also affected components of the citric acid cycle (TCA) and carbohydrates availability. Such changes in the metabolic composition of roots and leaves probably interfered with N assimilation and respiration. It also determined the proportions between N and starch in almond leaves, which formed a new index (N:ST) that starts at 0.4 in N deficiency and reaches 0.6-0.8 in optimal N conditions. Importantly, this index continues to increase in higher N conditions (as starch reduces) and essentially indicates to excessive N applications when it exceeds 1.1
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|a Journal Article
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|a Carbohydrates
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|a Nutrition
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|a Transpiration
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|a Karunakaran, Ranjith
|e verfasserin
|4 aut
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|a Erel, Ran
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|a Yasuor, Hagai
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|a Klipcan, Liron
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|a Yermiyahu, Uri
|e verfasserin
|4 aut
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 143(2019) vom: 01. Okt., Seite 265-274
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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|g volume:143
|g year:2019
|g day:01
|g month:10
|g pages:265-274
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|u http://dx.doi.org/10.1016/j.plaphy.2019.08.030
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