CO2 elevation and N fertilizer supply modulate leaf physiology, crop growth and water use efficiency of maize in response to progressive soil drought
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Elevated atmospheric CO2 concentration (e[CO2]) and varied nitrogen (N) fertilization levels may mediate the different responses of C4 crops to progressive soil drought. In this study, the effects of reduced N (N1, 0.8 g pot−1) and adequate N (N2, 1.6 g pot−1) supply on leaf physiology, plant growth and water use efficiency (WUE) of maize (C4crop) exposed to progressive soil drought grown at ambient CO2 (a[CO2], 400 ppm) and elevated CO2 (e[CO2], 800 ppm) concentration were investigated. The results in-dicated that compared with a[CO2], net photosynthetic rate (An) and leaf water po-tential (Ψl) at e[CO2] were maintained in maize leaves, while stomatal conductance (gs), transpiration rate and leaf hydraulic conductance were decreased, leading to en-hanced WUE from stomatal to leaf scale. Despite An and Ψl of e[CO2] plants were more sensitive to progressive soil drought under both N fertilization levels, e[CO2] would increase leaf ABA concentration ([ABA]leaf) but decline the gs response to [ABA]leafunder N1 supply. e[CO2] coupled with N1 fertilization was conducive to enlarging leaf area, promoting specific leaf area, root and total dry mass, whereas reduced stomatal aperture and plant water use under progressive drought stress, contributing to an improvement in plant WUE, implying a better modulation of maize leaf stomata and water status under reduced N supply combined with e[CO2] responding to progres-sive soil drought. These findings in the current study would provide valuable advice for N management on maize (C4) crop efficient water use in a drier and CO2- enriched environment.
Originalsprog | Engelsk |
---|---|
Artikelnummer | e12692 |
Tidsskrift | Journal of Agronomy and Crop Science |
Vol/bind | 210 |
Udgave nummer | 2 |
Antal sider | 13 |
ISSN | 0931-2250 |
DOI | |
Status | Udgivet - 2024 |
Bibliografisk note
Funding Information:
This work was supported by the National Natural Science Foundation of China (51909220) and Natural Science Basic Research Program of Shaanxi Province2024JC‐YBQN‐0491.
Funding Information:
This work was supported by the National Natural Science Foundation of China (51909220) and Natural Science Basic Research Program of Shaanxi Province2024JC-YBQN-0491.
Publisher Copyright:
© 2024 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.
ID: 387741383