The effect of individual and combined drought and heat stress under elevated CO2 on physiological responses in spring wheat genotypes

Lamis Abdelhakim; Carolina Falcato Fialho Palma; Rong Zhou; Bernd Wollenweber; Carl-Otto Ottosen; Eva Rosenqvist

doi:10.1016/j.plaphy.2021.02.015

The effect of individual and combined drought and heat stress under elevated CO2 on physiological responses in spring wheat genotypes

Lamis Abdelhakim^*, Carolina Falcato Fialho Palma, Rong Zhou, Bernd Wollenweber, Carl-Otto Ottosen, Eva Rosenqvist

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

34 Citationer (Scopus)

Abstract

Abiotic stress due to climate change with continuous rise of atmospheric CO2 concentration is predicted to cause severe changes to crop productivity. Thus, research into wheat cultivars, capable of maintaining yield under limiting conditions is necessary. The aim of this study was to investigate the physiological responses of spring wheat to individual and combined drought- and heat events and their interaction with CO2 concentration. Two heat sensitive (LM19, KU10) and two heat tolerant (LM62, GN5) genotypes were selected and grown under ambient (400 ppm, aCO2) and elevated (800 ppm, eCO2) CO2 concentrations. At the tillering stage, the wheat plants were subjected to different treatments: control, progressive drought, heat and combined drought and heat stress. Our results showed that eCO2 mitigated the negative impact of the moderate stress in all genotypes. However, no distinctive responses were observed in some of the measured parameters between heat sensitive and tolerant genotypes. All genotypes grown at eCO2 had significantly higher net photosynthetic rates and maintained maximum quantum efficiency of PSII photochemistry under heat and combined stress compared to aCO2. Under heat and combined stress, the chlorophyll a:b ratios decreased only in heat tolerant genotypes at eCO2 compared to the control. Furthermore, the heat tolerant genotypes grown at eCO2 showed an increased glucose and fructose contents and a decreased sucrose content under combined stress compared to aCO2. These findings provide new insights into the underlying mechanisms of different genotypic responses to combined abiotic stresses at eCO2 that differ from the response to individual stresses.

Originalsprog	Engelsk
Tidsskrift	Plant Physiology and Biochemistry
Vol/bind	162
Sider (fra-til)	301-314
Antal sider	14
ISSN	0981-9428
DOI	https://doi.org/10.1016/j.plaphy.2021.02.015
Status	Udgivet - maj 2021

Emneord

Chlorophyll flourescence
Drought
Gas exchange
Heat stress
climate change
elevated CO2

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10.1016/j.plaphy.2021.02.015

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Citationsformater

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title = "The effect of individual and combined drought and heat stress under elevated CO2 on physiological responses in spring wheat genotypes",

abstract = "Abiotic stress due to climate change with continuous rise of atmospheric CO2 concentration is predicted to cause severe changes to crop productivity. Thus, research into wheat cultivars, capable of maintaining yield under limiting conditions is necessary. The aim of this study was to investigate the physiological responses of spring wheat to individual and combined drought- and heat events and their interaction with CO2 concentration. Two heat sensitive (LM19, KU10) and two heat tolerant (LM62, GN5) genotypes were selected and grown under ambient (400 ppm, aCO2) and elevated (800 ppm, eCO2) CO2 concentrations. At the tillering stage, the wheat plants were subjected to different treatments: control, progressive drought, heat and combined drought and heat stress. Our results showed that eCO2 mitigated the negative impact of the moderate stress in all genotypes. However, no distinctive responses were observed in some of the measured parameters between heat sensitive and tolerant genotypes. All genotypes grown at eCO2 had significantly higher net photosynthetic rates and maintained maximum quantum efficiency of PSII photochemistry under heat and combined stress compared to aCO2. Under heat and combined stress, the chlorophyll a:b ratios decreased only in heat tolerant genotypes at eCO2 compared to the control. Furthermore, the heat tolerant genotypes grown at eCO2 showed an increased glucose and fructose contents and a decreased sucrose content under combined stress compared to aCO2. These findings provide new insights into the underlying mechanisms of different genotypic responses to combined abiotic stresses at eCO2 that differ from the response to individual stresses.",

keywords = "Chlorophyll flourescence, Drought, Gas exchange, Heat stress, climate change, elevated CO2",

author = "Lamis Abdelhakim and {Falcato Fialho Palma}, Carolina and Rong Zhou and Bernd Wollenweber and Carl-Otto Ottosen and Eva Rosenqvist",

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doi = "10.1016/j.plaphy.2021.02.015",

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The effect of individual and combined drought and heat stress under elevated CO2 on physiological responses in spring wheat genotypes. / Abdelhakim, Lamis; Falcato Fialho Palma, Carolina; Zhou, Rong et al.
I: Plant Physiology and Biochemistry, Bind 162, 05.2021, s. 301-314.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

TY - JOUR

T1 - The effect of individual and combined drought and heat stress under elevated CO2 on physiological responses in spring wheat genotypes

AU - Abdelhakim, Lamis

AU - Falcato Fialho Palma, Carolina

AU - Zhou, Rong

AU - Wollenweber, Bernd

AU - Ottosen, Carl-Otto

AU - Rosenqvist, Eva

PY - 2021/5

Y1 - 2021/5

N2 - Abiotic stress due to climate change with continuous rise of atmospheric CO2 concentration is predicted to cause severe changes to crop productivity. Thus, research into wheat cultivars, capable of maintaining yield under limiting conditions is necessary. The aim of this study was to investigate the physiological responses of spring wheat to individual and combined drought- and heat events and their interaction with CO2 concentration. Two heat sensitive (LM19, KU10) and two heat tolerant (LM62, GN5) genotypes were selected and grown under ambient (400 ppm, aCO2) and elevated (800 ppm, eCO2) CO2 concentrations. At the tillering stage, the wheat plants were subjected to different treatments: control, progressive drought, heat and combined drought and heat stress. Our results showed that eCO2 mitigated the negative impact of the moderate stress in all genotypes. However, no distinctive responses were observed in some of the measured parameters between heat sensitive and tolerant genotypes. All genotypes grown at eCO2 had significantly higher net photosynthetic rates and maintained maximum quantum efficiency of PSII photochemistry under heat and combined stress compared to aCO2. Under heat and combined stress, the chlorophyll a:b ratios decreased only in heat tolerant genotypes at eCO2 compared to the control. Furthermore, the heat tolerant genotypes grown at eCO2 showed an increased glucose and fructose contents and a decreased sucrose content under combined stress compared to aCO2. These findings provide new insights into the underlying mechanisms of different genotypic responses to combined abiotic stresses at eCO2 that differ from the response to individual stresses.

AB - Abiotic stress due to climate change with continuous rise of atmospheric CO2 concentration is predicted to cause severe changes to crop productivity. Thus, research into wheat cultivars, capable of maintaining yield under limiting conditions is necessary. The aim of this study was to investigate the physiological responses of spring wheat to individual and combined drought- and heat events and their interaction with CO2 concentration. Two heat sensitive (LM19, KU10) and two heat tolerant (LM62, GN5) genotypes were selected and grown under ambient (400 ppm, aCO2) and elevated (800 ppm, eCO2) CO2 concentrations. At the tillering stage, the wheat plants were subjected to different treatments: control, progressive drought, heat and combined drought and heat stress. Our results showed that eCO2 mitigated the negative impact of the moderate stress in all genotypes. However, no distinctive responses were observed in some of the measured parameters between heat sensitive and tolerant genotypes. All genotypes grown at eCO2 had significantly higher net photosynthetic rates and maintained maximum quantum efficiency of PSII photochemistry under heat and combined stress compared to aCO2. Under heat and combined stress, the chlorophyll a:b ratios decreased only in heat tolerant genotypes at eCO2 compared to the control. Furthermore, the heat tolerant genotypes grown at eCO2 showed an increased glucose and fructose contents and a decreased sucrose content under combined stress compared to aCO2. These findings provide new insights into the underlying mechanisms of different genotypic responses to combined abiotic stresses at eCO2 that differ from the response to individual stresses.

KW - Chlorophyll flourescence

KW - Drought

KW - Gas exchange

KW - Heat stress

KW - climate change

KW - elevated CO2

UR - http://www.scopus.com/inward/record.url?scp=85102604120&partnerID=8YFLogxK

U2 - 10.1016/j.plaphy.2021.02.015

DO - 10.1016/j.plaphy.2021.02.015

M3 - Journal article

C2 - 33714145

SN - 0981-9428

VL - 162

SP - 301

EP - 314

JO - Plant Physiology and Biochemistry

JF - Plant Physiology and Biochemistry

ER -