TaANR1-TaBG1 and TaWabi5-TaNRT2s/NARs Link ABA Metabolism and Nitrate Acquisition in Wheat Roots

Overview

Journal Plant Physiol

Specialty Physiology

Date 2020 Jan 16

PMID 31937682

Citations 22

Authors

Meng Wang

Pengli Zhang

Qian Liu

Guangjie Li

Dongwei Di

Guangmin Xia

Herbert J Kronzucker

Shuang Fang

Jinfang Chu

Weiming Shi

Affiliations

Soon will be listed here.

Abstract

Nitrate is the preferred form of nitrogen for most plants, acting both as a nutrient and a signaling molecule. However, the components and regulatory factors governing nitrate uptake in bread wheat (), one of the world's most important crop species, have remained unclear, largely due to the complexity of its hexaploid genome. Here, based on recently released whole-genome information for bread wheat, the high-affinity nitrate transporter2 () and the nitrate-assimilation-related () gene family are characterized. We show that abscisic acid (ABA)- Glc ester deconjugation is stimulated in bread wheat roots by nitrate resupply following nitrate withdrawal, leading to enhanced root-tissue ABA accumulation, and that this enhancement, in turn, affects the expression of root-type / genes. TaANR1 is shown to regulate nitrate-mediated ABA accumulation by directly activating , while TaWabi5 is involved in ABA-mediated NO induction of / genes. Building on previous evidence establishing ABA involvement in the developmental response to high-nitrate stress, our study suggests that ABA also contributes to the optimization of nitrate uptake by regulating the expression of / genes under limited nitrate supply, offering a new target for improvement of nitrate absorption in crops.

Citing Articles

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