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פותח על ידי קלירמאש פתרונות בע"מ -
Excessive nitrogen impairs hydraulics, limits photosynthesis, and alters the metabolic composition of almond trees
Year:
2019
Source of publication :
Plant Physiology and Biochemistry
Authors :
אראל, רן
;
.
יסעור, חגי
;
.
ירמיהו, אורי
;
.
קארונקראן, רנג'יט
;
.
קליפצאן, לירון
;
.
שפרלינג, אור
;
.
Volume :
143
Co-Authors:
Facilitators :
From page:
265
To page:
274
(
Total pages:
10
)
Abstract:

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. © 2019 Elsevier Masson SAS

Note:
Related Files :
carbohydrates
nutrition
transpiration
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.plaphy.2019.08.030
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
44086
Last updated date:
02/03/2022 17:27
Creation date:
03/10/2019 13:23
Scientific Publication
Excessive nitrogen impairs hydraulics, limits photosynthesis, and alters the metabolic composition of almond trees
143
Excessive nitrogen impairs hydraulics, limits photosynthesis, and alters the metabolic composition of almond trees

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. © 2019 Elsevier Masson SAS

Scientific Publication
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