Elevated atmospheric CO2 decreases the ammonia compensation point of barley plants

Liang Wang; Pai Pedas; Ulf Dennis Eriksson; Jan K. Schjørring

doi:10.1093/jxb/ert117

Elevated atmospheric CO₂ decreases the ammonia compensation point of barley plants

Liang Wang, Pai Pedas, Ulf Dennis Eriksson, Jan K. Schjørring

Plante- og Jordvidenskab

15 Citationer (Scopus)

Abstract

The ammonia compensation point (chi(NH3)) controls the direction and magnitude of NH3 exchange between plant leaves and the atmosphere. Very limited information is currently available on how chi(NH3) responds to anticipated climate changes. Young barley plants were grown for 2 weeks at ambient (400 mu mol mol(-1)) or elevated (800 mu mol mol(-1)) CO2 concentration with NO3- or NH4NO3 as the nitrogen source. The concentrations of NH4+ and H+ in the leaf apoplastic solution were measured along with different foliar N pools and enzymes involved in N metabolism. Elevated CO2 caused a threefold decrease in the NH4+ concentration in the apoplastic solution and slightly acidified it. This resulted in a decline of the chi(NH3) from 2.25 and 2.95 nmol mol(-1) under ambient CO2 to 0.37 and 0.89 nmol mol(-1) at elevated CO2 in the NO3- and NH4NO3 treatments, respectively. The decrease in chi(NH3) at elevated CO2 reflected a lower N concentration (-25 in the shoot dry matter. The activity of nitrate reductase also declined (-45 to -60, while that of glutamine synthetase was unaffected by elevated CO2. It is concluded that elevated CO2 increases the likelihood of plants being a sink for atmospheric NH3 and reduces episodes of NH3 emission from plants.

Originalsprog	Engelsk
Tidsskrift	Journal of Experimental Botany
Vol/bind	64
Udgave nummer	10
Sider (fra-til)	2713-2724
Antal sider	12
ISSN	0022-0957
DOI	https://doi.org/10.1093/jxb/ert117
Status	Udgivet - jul. 2013

Emneord

ammonia compensation point (NH3)
barley
carbon dioxide (CO2)
climate change
nitrate reductase
nitrogen metabolism

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Adgang til dokumentet

10.1093/jxb/ert117

Citationsformater

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title = "Elevated atmospheric CO2 decreases the ammonia compensation point of barley plants",

abstract = "The ammonia compensation point () controls the direction and magnitude of NH3 exchange between plant leaves and the atmosphere. Very limited information is currently available on how responds to anticipated climate changes. Young barley plants were grown for 2 weeks at ambient (400 μmol mol-1) or elevated (800 μmol mol-1) CO2 concentration with or NH4NO3 as the nitrogen source. The concentrations of and H+ in the leaf apoplastic solution were measured along with different foliar N pools and enzymes involved in N metabolism. Elevated CO2 caused a threefold decrease in the concentration in the apoplastic solution and slightly acidified it. This resulted in a decline of the from 2.25 and 2.95 nmol mol-1 under ambient CO2 to 0.37 and 0.89 nmol mol-1 at elevated CO2 in the and NH4NO3 treatments, respectively. The decrease in at elevated CO2 reflected a lower N concentration (-25%) in the shoot dry matter. The activity of nitrate reductase also declined (-45 to -60%), while that of glutamine synthetase was unaffected by elevated CO2. It is concluded that elevated CO2 increases the likelihood of plants being a sink for atmospheric NH3 and reduces episodes of NH3 emission from plants.",

keywords = "ammonia compensation point (NH3), barley, carbon dioxide (CO2), climate change, nitrate reductase, nitrogen metabolism",

author = "Liang Wang and Pai Pedas and Eriksson, {Ulf Dennis} and Schj{\o}rring, {Jan K.}",

year = "2013",

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doi = "10.1093/jxb/ert117",

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TY - JOUR

T1 - Elevated atmospheric CO2 decreases the ammonia compensation point of barley plants

AU - Wang, Liang

AU - Pedas, Pai

AU - Eriksson, Ulf Dennis

AU - Schjørring, Jan K.

PY - 2013/7

Y1 - 2013/7

N2 - The ammonia compensation point () controls the direction and magnitude of NH3 exchange between plant leaves and the atmosphere. Very limited information is currently available on how responds to anticipated climate changes. Young barley plants were grown for 2 weeks at ambient (400 μmol mol-1) or elevated (800 μmol mol-1) CO2 concentration with or NH4NO3 as the nitrogen source. The concentrations of and H+ in the leaf apoplastic solution were measured along with different foliar N pools and enzymes involved in N metabolism. Elevated CO2 caused a threefold decrease in the concentration in the apoplastic solution and slightly acidified it. This resulted in a decline of the from 2.25 and 2.95 nmol mol-1 under ambient CO2 to 0.37 and 0.89 nmol mol-1 at elevated CO2 in the and NH4NO3 treatments, respectively. The decrease in at elevated CO2 reflected a lower N concentration (-25%) in the shoot dry matter. The activity of nitrate reductase also declined (-45 to -60%), while that of glutamine synthetase was unaffected by elevated CO2. It is concluded that elevated CO2 increases the likelihood of plants being a sink for atmospheric NH3 and reduces episodes of NH3 emission from plants.

AB - The ammonia compensation point () controls the direction and magnitude of NH3 exchange between plant leaves and the atmosphere. Very limited information is currently available on how responds to anticipated climate changes. Young barley plants were grown for 2 weeks at ambient (400 μmol mol-1) or elevated (800 μmol mol-1) CO2 concentration with or NH4NO3 as the nitrogen source. The concentrations of and H+ in the leaf apoplastic solution were measured along with different foliar N pools and enzymes involved in N metabolism. Elevated CO2 caused a threefold decrease in the concentration in the apoplastic solution and slightly acidified it. This resulted in a decline of the from 2.25 and 2.95 nmol mol-1 under ambient CO2 to 0.37 and 0.89 nmol mol-1 at elevated CO2 in the and NH4NO3 treatments, respectively. The decrease in at elevated CO2 reflected a lower N concentration (-25%) in the shoot dry matter. The activity of nitrate reductase also declined (-45 to -60%), while that of glutamine synthetase was unaffected by elevated CO2. It is concluded that elevated CO2 increases the likelihood of plants being a sink for atmospheric NH3 and reduces episodes of NH3 emission from plants.

KW - ammonia compensation point (NH3)

KW - barley

KW - carbon dioxide (CO2)

KW - climate change

KW - nitrate reductase

KW - nitrogen metabolism

U2 - 10.1093/jxb/ert117

DO - 10.1093/jxb/ert117

M3 - Journal article

C2 - 23740933

SN - 0022-0957

VL - 64

SP - 2713

EP - 2724

JO - Journal of Experimental Botany

JF - Journal of Experimental Botany

IS - 10

ER -