Nitrate signaling promotes plant growth by upregulating gibberellin biosynthesis and destabilization of DELLA proteins

A - Papers appearing in refereed journals

Camut, L., Gallova, B., Jilli, L., Sirlin-Josserand, M., Carrera, E., Sakvarelidze-Achard, L., Ruffel, S., Krouk, G., Thomas, S. G., Hedden, P., Phillips, A. L., Daviere, J-M. and Achard, P. 2021. Nitrate signaling promotes plant growth by upregulating gibberellin biosynthesis and destabilization of DELLA proteins. Current Biology. 31 (22), pp. 4971-4982. https://doi.org/10.1016/j.cub.2021.09.024

AuthorsCamut, L., Gallova, B., Jilli, L., Sirlin-Josserand, M., Carrera, E., Sakvarelidze-Achard, L., Ruffel, S., Krouk, G., Thomas, S. G., Hedden, P., Phillips, A. L., Daviere, J-M. and Achard, P.
Abstract

Nitrate, one of the main nitrogen (N) sources for crops, acts as a nutrient and key signaling molecule coordinating gene expression, metabolism, and various growth processes throughout the plant life cycle. It is widely accepted that nitrate-triggered developmental programs cooperate with hormone synthesis and transport to finely adapt plant architecture to N availability. Here, we report that nitrate, acting through its signaling pathway, promotes growth in Arabidopsis and wheat, in part by modulating the accumulation of gibberellin (GA)-regulated DELLA growth repressors. We show that nitrate reduces the abundance of DELLAs by increasing GA contents through activation of GA metabolism gene expression. Consistently, the growth restraint conferred by nitrate deficiency is partially rescued in global-DELLA mutant that lacks all DELLAs. At the cellular level, we show that nitrate enhances both cell proliferation and elongation in a DELLA dependent and independent manner, respectively. Our findings establish a connection between nitrate and GA signaling pathways that allow plants to adapt their growth to nitrate availability plants to adapt their growth to nitrate availability

KeywordsNitrate; Gibberellins; Hormone biosynthesis; DELLA proteins; Growth; Plant development; Arabidopsis; Wheat
Year of Publication2021
JournalCurrent Biology
Journal citation31 (22), pp. 4971-4982
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cub.2021.09.024
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat - WP1 - Increased efficiency and sustainability
Output statusPublished
Publication dates
Online05 Oct 2021
PublisherCell Press
ISSN0960-9822

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