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The Mechanisms Responsible for N Deficiency in Well-Watered Wheat Under Elevated CO2
Year:
2022
Source of publication :
Frontiers in Plant Science
Authors :
Ben-Gal, Alon
;
.
Halpern, Moshe
;
.
Yermiyahu, Uri
;
.
Volume :
Co-Authors:

Jinjie Fan
Moshe Halpern
Yangliu Yu
Qiang Zuo
Jianchu Shi
Yuchuan Fan
Xun Wu
Uri Yermiyahu
Jiandong Sheng
Pingan Jiang
Alon Ben-Gal

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Elevated CO2 concentration [e(CO2)] often promotes plant growth with a decrease in tissue N concentration. In this study, three experiments, two under hydroponic and one in well-watered soil, including various levels or patterns of CO2, humidity, and N supply were conducted on wheat (Triticum aestivum L.) to explore the mechanisms of e[CO2]-induced N deficiency (ECIND). Under hydroponic conditions, N uptake remained constant even as transpiration was limited 40% by raising air relative humidity and only was reduced about 20% by supplying N during nighttime rather than daytime with a reduction of 85% in transpiration. Compared to ambient CO2 concentration, whether under hydroponic or well-watered soil conditions, and whether transpiration was kept stable or decreased to 12%, e[CO2] consistently led to more N uptake and higher biomass, while lower N concentration was observed in aboveground organs, especially leaves, as long as N supply was insufficient. These results show that, due to compensation caused by active uptake, N uptake can be uncoupled from water uptake under well-watered conditions, and changes in transpiration therefore do not account for ECIND. Similar or lower tissue NO−3NO3--N concentration under e[CO2] indicated that NO−3NO3- assimilation was not limited and could therefore also be eliminated as a major cause of ECIND under our conditions. Active uptake has the potential to bridge the gap between N taken up passively and plant demand, but is limited by the energy required to drive it. Compared to ambient CO2 concentration, the increase in N uptake under e[CO2] failed to match the increase of carbohydrates, leading to N dilution in plant tissues, the apparent dominant mechanism explaining ECIND. Lower N concentration in leaves rather than roots under e[CO2] validated that ECIND was at least partially also related to changes in resource allocation, apparently to maintain root uptake activity and prevent more serious N deficiency.

Note:
Related Files :
elevated CO2 concentration
Nitrogen deficiency
nitrogen dilution
nitrogen uptake
photosynthesis
transpiration
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More details
DOI :
10.3389/fpls.2022.801443
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
58265
Last updated date:
22/03/2022 15:09
Creation date:
22/03/2022 14:46
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Scientific Publication
The Mechanisms Responsible for N Deficiency in Well-Watered Wheat Under Elevated CO2

Jinjie Fan
Moshe Halpern
Yangliu Yu
Qiang Zuo
Jianchu Shi
Yuchuan Fan
Xun Wu
Uri Yermiyahu
Jiandong Sheng
Pingan Jiang
Alon Ben-Gal

The Mechanisms Responsible for N Deficiency in Well-Watered Wheat Under Elevated CO2

Elevated CO2 concentration [e(CO2)] often promotes plant growth with a decrease in tissue N concentration. In this study, three experiments, two under hydroponic and one in well-watered soil, including various levels or patterns of CO2, humidity, and N supply were conducted on wheat (Triticum aestivum L.) to explore the mechanisms of e[CO2]-induced N deficiency (ECIND). Under hydroponic conditions, N uptake remained constant even as transpiration was limited 40% by raising air relative humidity and only was reduced about 20% by supplying N during nighttime rather than daytime with a reduction of 85% in transpiration. Compared to ambient CO2 concentration, whether under hydroponic or well-watered soil conditions, and whether transpiration was kept stable or decreased to 12%, e[CO2] consistently led to more N uptake and higher biomass, while lower N concentration was observed in aboveground organs, especially leaves, as long as N supply was insufficient. These results show that, due to compensation caused by active uptake, N uptake can be uncoupled from water uptake under well-watered conditions, and changes in transpiration therefore do not account for ECIND. Similar or lower tissue NO−3NO3--N concentration under e[CO2] indicated that NO−3NO3- assimilation was not limited and could therefore also be eliminated as a major cause of ECIND under our conditions. Active uptake has the potential to bridge the gap between N taken up passively and plant demand, but is limited by the energy required to drive it. Compared to ambient CO2 concentration, the increase in N uptake under e[CO2] failed to match the increase of carbohydrates, leading to N dilution in plant tissues, the apparent dominant mechanism explaining ECIND. Lower N concentration in leaves rather than roots under e[CO2] validated that ECIND was at least partially also related to changes in resource allocation, apparently to maintain root uptake activity and prevent more serious N deficiency.

Scientific Publication
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