Impact of elevated CO2 on two contrasting wheat genotypes exposed to intermediate drought stress at anthesis
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Impact of elevated CO2 on two contrasting wheat genotypes exposed to intermediate drought stress at anthesis. / Shokat, Sajid; Grosskinsky, Dominik K.; Liu, Fulai.
In: Journal of Agronomy and Crop Science, Vol. 207, No. 1, 2021, p. 20-33.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Impact of elevated CO2 on two contrasting wheat genotypes exposed to intermediate drought stress at anthesis
AU - Shokat, Sajid
AU - Grosskinsky, Dominik K.
AU - Liu, Fulai
PY - 2021
Y1 - 2021
N2 - The objective of this experiment was to investigate the responses of contrasting wheat genotypes to drought stress under ambient and elevated CO(2)environments. At anthesis, the plants from each CO(2)levels were either exposed to progressive drought or well-watered at 95% of pot holding capacity. The results showed that for both genotypes, CO(2)elevation sensitized the plants' response to soil drying in terms of reduction of evapotranspiration. Drought significantly reducedtrans-zeatin (tZ) concentration in leaves, salicylic acid (SA) concentration in spikes, and physiological and yield-related traits. However, the concentration of abscisic acid (ABA) and other phytohormones was increased under drought, which coincided with an increase in the kernel abortion. Elevated CO(2)significantly increased photosynthetic rate, but had no significant effect on yield-related traits. Genotype L(3)possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO(2)as compared to genotype L-2. L(3)also had higher thousand kernel weight (TKW) and grain yield in comparison to L-2. The results indicate that elevated CO(2)is not necessarily increasing yield, and biophysiochemical traits in L(3)could be used as valuable selecting criteria to obtain higher TKW and grain yield in future drier and CO2-enriched environment.
AB - The objective of this experiment was to investigate the responses of contrasting wheat genotypes to drought stress under ambient and elevated CO(2)environments. At anthesis, the plants from each CO(2)levels were either exposed to progressive drought or well-watered at 95% of pot holding capacity. The results showed that for both genotypes, CO(2)elevation sensitized the plants' response to soil drying in terms of reduction of evapotranspiration. Drought significantly reducedtrans-zeatin (tZ) concentration in leaves, salicylic acid (SA) concentration in spikes, and physiological and yield-related traits. However, the concentration of abscisic acid (ABA) and other phytohormones was increased under drought, which coincided with an increase in the kernel abortion. Elevated CO(2)significantly increased photosynthetic rate, but had no significant effect on yield-related traits. Genotype L(3)possessed higher concentration of leaf tz, osmotic potential, and spike SA/ABA ratio under combined drought and elevated CO(2)as compared to genotype L-2. L(3)also had higher thousand kernel weight (TKW) and grain yield in comparison to L-2. The results indicate that elevated CO(2)is not necessarily increasing yield, and biophysiochemical traits in L(3)could be used as valuable selecting criteria to obtain higher TKW and grain yield in future drier and CO2-enriched environment.
KW - abscisic acid and elevated CO2
KW - C-FTSW
KW - drought
KW - salicylic acid
KW - tans-zeatin
KW - wheat
KW - PLANT WATER RELATIONS
KW - LEAF GAS-EXCHANGE
KW - STOMATAL CONDUCTANCE
KW - HEAT-STRESS
KW - GRAIN-YIELD
KW - CO2
KW - GROWTH
KW - CYTOKININS
KW - ABA
KW - L.
U2 - 10.1111/jac.12442
DO - 10.1111/jac.12442
M3 - Journal article
VL - 207
SP - 20
EP - 33
JO - Journal of Agronomy and Crop Science
JF - Journal of Agronomy and Crop Science
SN - 0931-2250
IS - 1
ER -
ID: 249865848