Rights statement: This is the peer reviewed version of the following article: Liu, J, Kang, S, Davies, WJ, Ding, R. Elevated [CO2] alleviates the impacts of water deficit on xylem anatomy and hydraulic properties of maize stems. Plant Cell Environ. 2020; 43: 563– 578. https://doi.org/10.1111/pce.13677 which has been published in final form at https://onlinelibrary.wiley.com/doi/abs/10.1111/pce.13677 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Elevated [CO2] alleviates the impacts of water deficit on xylem anatomy and hydraulic properties of maize stems
AU - Liu, J.
AU - Kang, S.
AU - Davies, W.J.
AU - Ding, R.
N1 - This is the peer reviewed version of the following article: Liu, J, Kang, S, Davies, WJ, Ding, R. Elevated [CO2] alleviates the impacts of water deficit on xylem anatomy and hydraulic properties of maize stems. Plant Cell Environ. 2020; 43: 563– 578. https://doi.org/10.1111/pce.13677 which has been published in final form at https://onlinelibrary.wiley.com/doi/abs/10.1111/pce.13677 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Plants can modify xylem anatomy and hydraulic properties to adjust to water status. Elevated [CO2] can increase plant water potential via reduced stomatal conductance and water loss. This raises the question of whether elevated [CO2], which thus improves plant water status, will reduce the impacts of soil water deficit on xylem anatomy and hydraulic properties of plants. To analyse the impacts of water and [CO2] on maize stem xylem anatomy and hydraulic properties, we exposed potted maize plants to varying [CO2] levels (400, 700, 900, and 1,200 ppm) and water levels (full irrigation and deficit irrigation). Results showed that at current [CO2], vessel diameter, vessel roundness, stem cross‐section area, specific hydraulic conductivity, and vulnerability to embolism decreased under deficit irrigation; yet, these impacts of deficit irrigation were reduced at elevated [CO2]. Across all treatments, midday stem water potential was tightly correlated with xylem traits and displayed similar responses. A distinct trade‐off between efficiency and safety in stem xylem water transportation in response to water deficit was observed at current [CO2] but not observed at elevated [CO2]. The results of this study enhance our knowledge of plant hydraulic acclimation under future climate environments and provide insights into trade‐offs in xylem structure and function.
AB - Plants can modify xylem anatomy and hydraulic properties to adjust to water status. Elevated [CO2] can increase plant water potential via reduced stomatal conductance and water loss. This raises the question of whether elevated [CO2], which thus improves plant water status, will reduce the impacts of soil water deficit on xylem anatomy and hydraulic properties of plants. To analyse the impacts of water and [CO2] on maize stem xylem anatomy and hydraulic properties, we exposed potted maize plants to varying [CO2] levels (400, 700, 900, and 1,200 ppm) and water levels (full irrigation and deficit irrigation). Results showed that at current [CO2], vessel diameter, vessel roundness, stem cross‐section area, specific hydraulic conductivity, and vulnerability to embolism decreased under deficit irrigation; yet, these impacts of deficit irrigation were reduced at elevated [CO2]. Across all treatments, midday stem water potential was tightly correlated with xylem traits and displayed similar responses. A distinct trade‐off between efficiency and safety in stem xylem water transportation in response to water deficit was observed at current [CO2] but not observed at elevated [CO2]. The results of this study enhance our knowledge of plant hydraulic acclimation under future climate environments and provide insights into trade‐offs in xylem structure and function.
KW - elevated [CO2]
KW - embolism
KW - hydraulic property
KW - maize
KW - water deficit
KW - Xylem anatomy
U2 - 10.1111/pce.13677
DO - 10.1111/pce.13677
M3 - Journal article
VL - 43
SP - 563
EP - 578
JO - Plant, Cell and Environment
JF - Plant, Cell and Environment
SN - 0140-7791
IS - 3
ER -