Elevated [CO2] alleviates the impacts of water deficit on xylem anatomy and hydraulic properties of maize stems

Liu, J. and Kang, S. and Davies, W.J. and Ding, R. (2020) Elevated [CO2] alleviates the impacts of water deficit on xylem anatomy and hydraulic properties of maize stems. Plant, Cell and Environment, 43 (3). pp. 563-578. ISSN 0140-7791

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Plant, Cell and Environment
Additional Information:
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.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1314
Subjects:
ID Code:
140012
Deposited By:
Deposited On:
25 Mar 2020 13:45
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Nov 2020 09:52