Elevated CO2 modulates the effects of drought and heat stress on plant water relations and grain yield in wheat
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Elevated CO2 modulates the effects of drought and heat stress on plant water relations and grain yield in wheat. / Li, Xiangnan; Kristiansen, Karina; Rosenqvist, Eva; Liu, Fulai.
In: Journal of Agronomy and Crop Science, Vol. 205, No. 4, 08.2019, p. 362-371.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Elevated CO2 modulates the effects of drought and heat stress on plant water relations and grain yield in wheat
AU - Li, Xiangnan
AU - Kristiansen, Karina
AU - Rosenqvist, Eva
AU - Liu, Fulai
PY - 2019/8
Y1 - 2019/8
N2 - To investigate the interactive effects of drought, heat and elevated atmospheric CO2 concentration ([CO2]) on plant water relations and grain yield in wheat, two wheat cultivars with different drought tolerance (Gladius and Paragon) were grown under ambient and elevated [CO2], and were exposed to post-anthesis drought and heat stress. The stomatal conductance, plant water relation parameters, abscisic acid concentration in leaf and spike, and grain yield components were examined. Both stress treatments and elevated [CO2] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential. Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [CO2] showed no effect. At maturity, post-anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%, while elevated [CO2] increased the grain yield by 20.8% in wheat, which was due to the changes of grain number per spike and thousand grain weight. This study suggested that the responses of plant water status and grain yield to extreme climatic events (heat and drought) can be influenced by the atmospheric CO2 concentration.
AB - To investigate the interactive effects of drought, heat and elevated atmospheric CO2 concentration ([CO2]) on plant water relations and grain yield in wheat, two wheat cultivars with different drought tolerance (Gladius and Paragon) were grown under ambient and elevated [CO2], and were exposed to post-anthesis drought and heat stress. The stomatal conductance, plant water relation parameters, abscisic acid concentration in leaf and spike, and grain yield components were examined. Both stress treatments and elevated [CO2] reduced the stomatal conductance, which resulted in lower leaf relative water content and leaf water potential. Drought induced a significant increase in leaf and spike abscisic acid concentrations, while elevated [CO2] showed no effect. At maturity, post-anthesis drought and heat stress significantly decreased the grain yield by 21.3%–65.2%, while elevated [CO2] increased the grain yield by 20.8% in wheat, which was due to the changes of grain number per spike and thousand grain weight. This study suggested that the responses of plant water status and grain yield to extreme climatic events (heat and drought) can be influenced by the atmospheric CO2 concentration.
KW - abscisic acid
KW - CO
KW - drought
KW - high temperature
KW - water status
KW - wheat
UR - http://www.scopus.com/inward/record.url?scp=85060916642&partnerID=8YFLogxK
U2 - 10.1111/jac.12330
DO - 10.1111/jac.12330
M3 - Journal article
AN - SCOPUS:85060916642
VL - 205
SP - 362
EP - 371
JO - Journal of Agronomy and Crop Science
JF - Journal of Agronomy and Crop Science
SN - 0931-2250
IS - 4
ER -
ID: 216212679