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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Diurnal regulation of rice N uptake ability under interrupted N supply

Md. Mehedi Hasan A , Gibrilla Dumbuya A B , Habtamu Assega Alemayehu C D , Uzuki Matsushima D , Maya Matsunami D and Hiroyuki Shimono https://orcid.org/0000-0002-7328-0483 D E *
+ Author Affiliations
- Author Affiliations

A United Graduate School of Agricultural Sciences, Iwate University, 3-18-8, Ueda, 020-8550, Morioka, Iwate, Japan.

B Sierra Leone Agricultural Research Institute/Njala Agricultural Research Centre, P.O. Box 540, Freetown, Sierra Leone.

C Ethiopian Institute of Agricultural Research/Fogera National Rice Research and Training Centre, P.O. Box 1937, Fogera, Ethiopia.

D Faculty of Agriculture, Iwate University, 3-18-8, Ueda, 020-8550, Morioka, Iwate, Japan.

E Agri-Innovation Center, Iwate University, 3-18-8, Ueda, 020-8550, Morioka, Iwate, Japan.

* Correspondence to: shimn@iwate-u.ac.jp

Handling Editor: Ulrike Mathesius

Functional Plant Biology 49(3) 219-230 https://doi.org/10.1071/FP21195
Submitted: 7 July 2021  Accepted: 28 November 2021   Published: 7 January 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Plants take up nitrogen (N) both day and night. The diurnal variation in N uptake results from interactions between aboveground and belowground tissues. We examined the long-term effects of interrupted N supply (day only or night only) under hydroponic conditions to test whether plant acclimatisation response to the interrupted N supply differs by day or night. Seedlings experienced 32 days under daytime-fed (DF), night-time-fed (NF), or continuous (CT) N supply. The root N uptake rate (NUR) differed between DF and NF from day 3 of treatment, after which NUR was significantly increased (by up to 82%) in DF and NF plants. The increased NUR during each half-day did not fully compensate for lost access to N during the other half-day, resulting in lower N accumulation by the end of the treatment. The reduction was smaller in DF plants than NF plants. The underlying mechanism of diurnal variation of N uptake is discussed in terms of transpiration demand and gene expression in roots.

Keywords: acclimatisation, aquaporins, diurnal change, diurnal rhythms, GOGAT, nitrogen, rice, root-zone, transpiration, transporters.


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